148 GLOSSARY. 



Transver'sus perinaB'i (L. transverse of the perinaeum). A 



muscle which arises from the inner surface of the pubic 



arch, and unites with its fellow of the opposite side. 

 Trape'zium (Gr. trapezion, a geometrical figure, from trapeza, a 



table or board). The name of one of the bones of the 



carpus. 

 Trape'zius (Gr. trapfzion, a geometrical figure). A large muscle 



passing from the back of the head, the neck, and dorsal 



vertebrae to the scapula and clavicle. 

 Tra'pezoid (Gr. trapeza, a table; eidos, shape). The name of 



one of the carpal bones. 

 Trema'toda (Gr. trema, trematos, a pore). A group of the 



Invertebrata placed by Huxley in the division named by 



him Trichoscolices. 

 Triangula'ris d'ris (L. triangular of the mouth). A muscle of 



the mouth, also named depressor anguli oris. 

 Triangula'ris ster'ni (L. triangular of the sternum). One of the 



muscles of the sternum which is a continuation of the 



transversalis abdominis. 



Trfceps bra'chii \ (L. three-headed muscle of the arm). 



Trfceps exten'sor cu/biti ) A large muscle of the dorsal 



aspect of the fore limb. 

 Triche'cidse (Gr. trichecus, a walrus). A group of the Pinnipedia 



which comprises the Walruses. 

 Tri'chocysts (Gr. thrix, Mchos, hair; kuslis, a bladder). 



Minute rod-like bodies from which cilia proceed in some 



Infusoria. 

 Tri'chophores (Gr. thrix, trtchos, hair ; phoreo, I bear). Sacs 



in the integument of the Polychaeta from which stiff hair- 

 like appendages spring. 

 Trichop'tera (Gr. thrix, trfhos, hair; ptcron, a wing). A 



group of the Insecta comprising the caddis-flies. 

 Trichoscolices (Gr. thrix, trfchos, hair; skolcx, a worm). A 



division of the Invertebrata proposed by Huxley to include 



the Trematoda, Turbellaria, Rotifera, Cestoidea, and 



Hirudinea, all of which possess cilia. 

 Tricus'pid (L. tria, three ; cuspis, a pointed extremity). 



Having three cusps, as the tricuspid ralrc between the 



right auricle and right ventricle of the heart. 

 Trldac'tyle (L. Ma, three; Gr. daktulos, a finger or toe). 



Having three digits. 

 Trifa'ciaL The name sometimes given to the fifth pair of 



nerves because they arise by three pairs of roots. 



