GLOSSAEY. 145 



and the proglottides which have successively budded from it. The name was 

 first applied to that of the Medusa, 

 SUPRA-OCCIPITAL (supra, above ; occiput, i. e., ob-caput, the hind-head), the bone 



which completes the first cranial segment above, answering to the lamina of 



the occipital bone in Man. 



SYMPHTSIS (ffv^tpvcns, a growing together), the union of two bones. 

 T.ENIA (a tape), a genus of intestinal worms, which gives its name to the order 

 Txniada, or Cestoid worms. The tape-worm, so-called, is a Strobilus formed 



of a seolex (the head ; and proglottides (the joints). 

 TARDIGRADA (tardus, slow ; gradior, to move), '' Water-sloths," an order of Crustacea 



otherwise known as Arctisca or Water-bears. 

 TARSVS (rapa-ds, the flat of the foot), the collection of small bones which form the 



heel or hock, and ankle ; corresponding with the carpus in the anterior limb. 

 TELEOSTEI (re\ews, perfect ; oo-reoc, bone), a name given by Muller to those Fish 



which have completely ossified skeletons: including the Osseopterygii of 



Cuvier, beside the small orders Lophobranchii and Plectognathi, and corre- 

 sponding with the Ctenoids (with serrated scales) and Cycloids (with smooth- 

 edged scales) of Agassiz. 

 TELSOS (reAo-oi/, a Homeric form of rf\os, end), applied to the central part of the 



last somite of the higher Crustacea. 

 TEKTACTLUM (tento, to touch}, a feeler. 



TEREBRVTCLA (dim. of terebra, a borer), a genus of Brachiopoda. 

 TERGUM (the back), applied to the upper segment of the exoskeleton of the 



somites of an Arthropod. 



TEST (testa, a shell), applied to the chitinous covering of the Tunicata. 

 THECODONT (<Mj/c7j, a case, fr. TlBrifu ; o$ovs, a tooth), having teeth implanted in 



distinct sockets or alveoli. 

 THORAX (<Wpa|, a breastplate), applied in Vertebrata to the part of the trunk above 



the diaphragm, in Insects to the central segment formed of three consolidated 



somites. 



THYLACINUS (SuXoKoy, a pouch), a genus of Marsupialia, of carnivorous habits. 

 THYSANURA (6v<Toa>os, a tassel ; ovpd, a tail), a group of Insects with fringed appen- 

 dages, which are attached to the end of the abdomen. 

 TIBIA, the shin-bone, the praeaxial bone of the lower extremity answering to the 



radius in the upper. 

 TRABECUL^: (cranii), dim. ottrabs, abeam, applied to the longitudinal cartilaginous 



bars in the embryonic skull, which enclose between them the " Sella Turcica " 



for the Pituitary Body. 

 TRACHEA (rpaxt'ia, sc. aprypla, the rough windpipe), in air-breathing Vertebrata 



the tube leading to the lungs, in Insects the air-tubes which ramify throughout 



the body. 

 TBEMATODA (i-pTJ/ua, a hole; rp-nfjiardi^s is applied by Aristotle to burrowing 



animals), an order of Scolecida with a single opening leading to a racemose 



digestive system. 

 TRICHINA (rpixivos, adj. of Opi, hair), a minute Nematoid worm parasitic in human 



muscle. 



TRICHOCEPHALCS (fyf{, Ke<pa\-fj) & Nematoid intestinal worm. 

 TRICHOPTERA (flp{, a hair ; irrep6i>, wing), an order of Insects with hairy wings. 

 TROCHAL disk (rpo\6s, a wheel), the surface around the mouth of a Rotifer, or 



Wheel-animalcule, on which are set the cilia whose motion produces the 



appearance from which it takes its name. 



