ELEMENTARY TERMS. 31 



LATERAL-LINE, the side-line of many fish, dividing the 



hack from the belly. 

 DORSAL, relating to the back. 



DORSAL FINS, any back-fin between the head and tail-fin. 

 PECTORAL- FINS, a pair growing on each side the breat. 

 POISERS or HALTERS, globules on slender stems under 



the wings of some two- winged insects. 

 SCUTEL, or ESCUTCHEON, a piece between the bases of 



the upper wings, on the backs of insects. 

 HYALINE SCUTEL, &c. glass-like. 



IV. RELATING TO THE ABDOMEN OR BELLY. 



NAYANT, floating in water. 



TURBINATE, shaped like a top. 



PHOSPHORESCENT, emitting light in the dark. 



ABDOMINAL, relating to the belly. 



ABDOMINAL-RINGS, annulas, or ring-form segments of 

 the bell^ of insects ; generally 5. 



CLOACA, a general vent, where eggs, urine and foeces 

 are evacuated. 



VENT, the aperture in fish where foeces, &c. are dis- 

 charged. 



ANAL-FINS, one or more between the vent and caudal 

 fins. 



ABDOMINAL-PINS, any where under the fish, between the 

 head and vent. 



V. RELATING TO FORE LEGS AND WINGS; 



AULULET, (spurious wing,) a tuft of 3 or 5 feathers on 

 the outer fore-joint of a bird's wing. 



TECTRICS, (wing-coverts,) the longest feathers in a 

 wing, next above the quilla. 



MINOR-TECTRICS, (lesser wing-coverts,) the wing-fea- 

 thers above the tec tries. 



