GLOSSARY. 65 1 



Tko'ohal (Gr. troclios, a wlieel). "Wheel-shaped ; applied to the ciliated disc 

 of the BoUfera. 



Tbo-ohait'tbb (Gr. trecho, I run). A process of the upper part of the thigh- 

 bone (femwr) to 'whioh are attached the muscles wnioh rotate the limb. 

 There may be two, or even three, trochanters present. 



Tbo'ohoid (Gr. (roohos, a wheel ; and eidos, form). Conical, with a flat base ; 

 applied to the shells of Forarmnifera and Vnmahe Molluscs. 



Tbo'phi (Gr. trophos, a nourisher). The parts of the mouth in insects which 

 are concerned in the acquisition and preparation of food. Often called 

 " ihstrumenta oibaria." 



Teoph'o-some (Gr. trepho, I nourish ; and somo, body). Applied collectively 

 to the assemblage of the nutritive zooids of any Itydronoon. 



Tbds-'oa-ted (Lat. irunco,_ I shorten). Abruptly cut off; applied to univalve 

 shells, the apex of whioh breaks oflT, so that the shell becomes " decol- 

 lated." 



Td-bio'o-la (Lat. tuba, a tube ; and cola, I inhabit). The order of Annelida 

 which construct a tubular case in whioh they protect themselves. 



Tu-Bio'o-LODs. Inhabiting a tube. 



Tu-bu-lab'i-da. 



Tu-ni-oa'ta (Lat. tunica, a cloak). A class of Molhiscoida which are envel- 

 oped in a tough, leathery case or " test." 



Tub-bbl-la'ei-a (Lat. turbo, I disturb). An order of ScoleHda. 



ToE'Ei-UA.<rED (Lat. torJo, a top). Top-shaped ; conical, with a round base. 



Ul'na (6r. olene, the elbow). iThe outermost of the two bones of the fore- 

 arm, corresponding with Xh.ejibula of the hiud-limb. 



Um'bel-latb (Lat. umbella, a parasol). Forming an umbel — i. e., a number 

 of nearly equal radii, all proceeding &om one point. 



tTM-Bit'i-ous (Lat. for navel). The aperture seen at the base of the axis of 

 certain univalve shells, whioh are then said to be " perforated" or " um- 

 bUicated." 



Um'so (Lat. for the boss of a shield). The beak of a bivalve shell. 



Um-bbbl'i.a. The contractile disc of one of the Zueernarida. 



Un'oi-nate (Lat. uncus, a hook). Provided with hooks or bent spines. 



Uk-ouio'u-latb (Lat. unguis, nail). Purnished with claws. 



Un-ou-la'ta (Lat. ungula, hoof).- The order of Mammals comprising the 

 Hoofed Quadrupeds. 



Un'ou-late. Famished with expanded nails constituting hoofs. 



U-Ni-LOo'u-iAE (Lat. unus, one ; and loculus, a little purse). Possessing a 

 single cavity or chamber. Applied to the shells of JForamimifera and Mol- 

 lusca. 



U'lri-VALVE (Lat. unus, one ; valvce, folding-doors). A shell composed of a 

 single piece or valve. 



U-eo-db'la (Gr. oura, tail ; delos, visible). The order of the tailed Amphi- 

 bians (Newts, etc.). 



UE'Ti-oA-TiKa Cells (Lat. urtica, a nettle). {See Cnidse.) 



Vao'u-oles (Lat. vaowus, empty). The little cavities formed in the interior 

 of many of the Protozoa by the presence of little particles of food, usually 

 surrounded by a little water. These are properly called " food-vacuoles," 

 and were supposed to be stomachs by Ehrenberg. Also the clear spaces 

 which are often seen in the tissues of many Cwlenterata, 



Vab'i-oes (Lat. varix, a dilated vein). The ridges or spinoae lines which 

 mark the former position of the mouth in certain univalve shells. 



Vas'od-lab (Lat. «a«, a vessel). Connected with the circulatory system. 



Ve'lum (Lat. for a sail). The membrane whioh surrounds and partially closes 

 the mouth of the " disc" otMedusie, or medusiform gonophores. 



Vbn'tbai, (Lat. venter, the stomach). Belating to the mfenor surface of the 

 body. 



Ven'tbi-olb (Lat. dim. of wnter, stomach). Applied to one of the cavities of 

 the heart, which receives blood from the auricle. 



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