30 ELEMENTARY TERMS. 



CULTRATE, a beak resembling a pruning-knife or coul- 

 ter. 



WATTLES, fleshy appendages under the chin. 



MissiLE-TONGue, which may be thrust far out of the 

 mouth. 



NICTITANT-MEMBRANE, a semi-transparent eye-lid. 



EXSERT, teeth, &c. projecting out. 



INCISORS, front, or cutting teeth. 



CUSPIDATES, canine teeth, next to Incisors. 



MOLARES, grinders, the teeth farthest backiri the mouth* 



VIBRISSAE, smellers, hair of the nostrils. 



PROTRUSILE, when the head may be thrust out. 



RETRACTILE, when the head may be drawn in. 



EFFUSE, with a pouring outlet, like a pitcher nose in 

 the mouth of sontfe shells, as cyprea. 



BYSSUS, silky fibres at the hinge or head of some shells. 



BEARD, tendril-form appendage to mouths of fish. 



GILL-COVERS, the bony or cartilagenous substance pla- 

 ced on the gill-membrane. 



GILL-MEMBRANE, the membrane covering the gills. 



BRONCHIAL, pertaining to the gills. 



STEMMATA, small lucid globules resembling eyes, 012 

 the top of the head ; generally three in number. 



II. RELATING TO THE NECK. 



SCRAG, back of a bird's neck. 



INDISTINCT, when the head and breast grow in one 

 piece. 



III. RELATING TO THE THORAX OR BREAST. 

 VENTRICLES, the larger cavities of the heart. 

 AURICLES, the smaller cavities, above the larger, and 

 resembling ears in appearance. 



