GLOSSARY. Iiy 



/terocar'diac os'sicle (Gr. pteron, a wing ; kardia, a stomach ; 

 L. ossiculum, a little bone). A small triangular ossicle in 

 the skeleton of the stomach in some Crustacea. 



./teroclomor'phse (Gr. pterodes, the generic name of the sand- 

 grouse ; morphe, form). A group of carinate birds com- 

 prising the sand-grouse. 



/terodac'tylus (Gr. pteron, a wing ; daktulos, a finger). An 

 extinct flying reptile belonging to the Pterosauria. 



-/tero'poda (Gr. pteron, a.vf\r\g;pous.podos 1 a foot ). A division 

 of the Mollusca which swim by w r ing-like processes at- 

 tached to the head. 



/terosau'ria (Gr. pteron, a wing ; sauros, a lizard). A group of 

 extinct flying reptiles. 



/tero'tic (Gr. pteron, a wing; ous, ofos, the ear). An ossifica- 

 tion of the skull occurring in some Vertebrata, between 

 the pro-otic and the epiotic bones. 



/ter'ygoid (Gr. pterux, a wing; eidos, form). The name of a 

 pair of bones, in the facial apparatus of some Vertebrata, 

 behind the palatines ; known in Human Anatomy as the 

 pterygoid plates of the sphenoid bone. 



/terygoi'deus pro'prins (L. special pterygoid). A small muscle 

 sometimes occurring, and which passes from the great 

 wing of the sphenoid bone to the palate bone or pterygoid 

 plate. 



/terygomaxillary fissure. A fissure which separates the 

 external pterygoid plate from the superior maxillary 

 bone. 



Pterygomaxillary ligament A narrow band of tendinous 

 fibres stretching from the internal pterygoid plates to the 

 lower jaw. 



/terygopa'latine artery. A small branch of the maxillary 

 artery. 



/terygopa'latine canal. A small canal between the internal 

 pterygoid plate and the palate bone which lodges the 

 pterygopalatine artery. 



Tterygosto'mial plates (Gr. pterux, a wing ; stoma, an opening). 

 The portions of the carapace in the Brachyura which 

 run forwards parallel with the axis of the body. 



/'ter'ylae (Gr. pterux, a wing). The bands of contour feathers 

 in birds. 



Pto'sis (Gr. ptoo, I fall). Inability to raise the upper eyelid. 



/'ty'alin (Gr.ptuo, I spit). The nitrogenous essential principle 

 of saliva. 



