Glossary of Technical Term* 



Transverse. Crosswise. 



Trenchant. Compressed to a sharp edge. 



Truncate. Abrupt, as if cut squarely off. 



Tubercle. A small excrescence, like a pimple. 



Type (of a genus). The species upon which was based the genus to which it 

 belongs. 



Type (of a species). The particular specimen upon which the original specific 

 description was based. 



Type locality. The particular place or locality at which the type specimen was 

 collected. 



Typical. Of a structure the most usual in a given group. 



Ultimate. Last or farthest. 



Unicolour. Of a single colour. 



Vent. The external opening of the alimentary canal. 



Ventral. Pertaining to the abdomen. 



Ventral fins. The paired fins behind or below the pectoral fins in fishes, corre- 

 sponding to the posterior limbs in the higher vertebrates. 



Ventral plates. In serpents or fishes, the row of plates along the belly between 

 throat and vent. 



Ventricle. One of the thick-walled chambers of the heart. 



Versatile. Capable of being turned either way. 



Vertebra. One of the bones of the spinal column. 



Vertical. Up and down. 



Vertical fins. The fins on the median line of the body; the dorsal, anal, and 

 caudal fins. 



Villiform. Said of the teeth of fishes when slender and crowded into velvety 

 bands. 



Viscous. Slimy 



Viviparous. Bringing forth living young. 



Vomer. In fishes, the front part of the roof of the mouth; a bone seen imme- 

 diately behind the premaxillaries. 



Zygapophyses. Points of bone affording to the vertebrae more or less definite 

 articulation with each other. 



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