Body whorl see last whorl

bolsters n.pl. [A.S. bolster, support] (MOLL) A pair of supports and muscle attachments for the radula.

bolus n. [Gr. bolos, lump] Any rounded mass, such as collected or chewed food.

bombifrons n.pl. [F. bombe, convex; L. frons, forehead] (ARTHRO: Insecta) A rounded, blister-like protuberance on the forward part of the head.

bombous a. [F. bombe, convex] A curved or rounded surface; blister-like.

bombycic acid (ARTHRO: Insecta) An acid utilized by certain moths to dissolve the gum binding the silk threads of the cocoon at imago emergence.

bombycinous a. [Gr. bombycinus, silken] Of silk, or pale yel low resembling fresh spun silk.

book gill (ARTHRO: Chelicerata) In Merostomata, a gill composed of thin plates or lamella.

book lung (ARTHRO: Chelicerata) A series of leaf-like respiratory pouches of arachnids, located on the internal ventral surface of the abdomen, and believed to be modified in-sunken gills.

bopyridum n. [NL. Bopyrus, type genus] (ARTHRO: Crustacea) In Malacostraca, a postlarva of an epicaridean isopod that attaches to a permanent host.

Bordas' gland (ARTHRO: Insecta) A paired, or fused into one, accessory gland of the sting apparatus of certain Hymen-optera, composed of multiple, densely packed cells whose canaliculi end with a gathering duct; function unknown.

boreal a. [L. boreas, north wind] Of or belonging to the northern biogeographical region.

borer n. [A.S. borian, bore] 1. An invertebrate that bores. 2. (ARTHRO: Insecta) An adult or larva that makes channels in woody or vegetable tissue. 3. (MOLL: Bivalvia) A pelecypod that burrows in stone or wood. 4. (MOLL: Gastropoda) One that bores through the shell of an oyster or other mollusk.

boss n.; pl. bosses [F. bosse, hump] 1. Any protruberant part, prominence or swelling. 2. (ARTHRO: Chelicerata) In Arach-nida, a smooth lateral prominence at the base of a cheli-cera of spiders. 3. (ARTHRO: Crustacea) An umbo. 4. (ARTHRO: Insecta) In Diptera, a sclerotized, elevated area at the base of the ventral brush in certain Culicidae larvae. 5. (ECHINOD: Echinoidea) The base of a spine on a sea urchin test. 6. (MOLL: Gastropoda) A rounded elevation of a shell, larger than a tubercle.

bosselated a. [F. bosse, hump] Being covered with small knob-like projections, composed of or covered with small protuberances.

bothridial seta (ARTHRO: Chelicerata) Variously shaped seta inserted into a bothridium.

bothridium n.; pl. -ria [Gr. dim. bothros, trench] 1. (ARTHRO: Chelicerata) A chitinous cavity or projecting cup in which a bothridial seta is inserted; (bothridial seta + bothridium =

trichobothrium). 2. (PLATY: Cestoda) One of 4 muscular lappets on the scolex of a tapeworm, often highly specialized with many types of adaptations for adhesion.

bothriotrichia n.pl. [Gr. bothros, trench; trichos, hair] (AR-THRO: Insecta) Slender seta arising from indentions in the tegument. bothronic a.

bothrium n.; pl. -ria [Gr. bothros, trench] (PLATY: Cestoda) Dorsal or ventral grooves on the scolex that may be variously modified in the form of ruffles, or fused so as to form a tubular structure.

botrucnids n.pl. [Gr. botrys, bunch of grapes; knide, nettle] (CNID: Anthozoa) The septal filaments of certain mesen-taries of tube anemones.

botryoidal a. [Gr. botrys, bunch of grapes; eidos, form] In the form of a bunch or cluster of grapes.

botryoidal tissue (ANN: Hirudinoidea) Connective tissue present in the enteric canals.

botryology n. [Gr. botrys, bunch of grapes; logos, discourse] The science of organizing objects or concepts into groups and clusters.

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