1907.] 



NATURAL SCIENCES OF PIIILADKLPHIA. 



465 



Lampetra aepytera (Abbott). Fig. 2. 



Animocoetes aepi/tern Ablxitt, Pror. .-Vend. Nat. Sci. Phila., 1860, p. 327. 

 Xo. Snl, typo. Ol.io Rivt-r. Dr. Ilildrctli. 



Width of head al)out 2^^ in its lcn,<:;tli, measured to first gill-opening; 

 witlth of disk 2|; intcrorbital spaec o; eye al)out 2 in interorl)ital space. 

 Bt)dy Avell compressed and edges rather convexly rounded, without 

 distinct keels niedianly. Muscular bands along side of body distinct, 

 of about even width, and a])out 53 between last gill-opening and vent. 

 Tail well compressed. Head sul)cylindrical, soon becoming com- 

 pressed at pharynx. Snout broadly convex, its width about IJ in its 

 length. i\Iouth moderately large, disk-like, rounded and circular. 

 Edges of disk thus formed rather thick, fleshy, and with a fringe of 



;:Kari;iiliii;iMiii i; feK;i;c^.;;, 



Fig. 2. — Lampetra oepytera (Abbott). (Type of Ammocoetes cepytera Abbott.) 



short and rather inconspicuous fleshy flai)S. Teeth few, strong and 

 rather large. If outer teeth occur over surface of disk they are minute, 

 imbedded more or less, or deciduous, as no traces seem evident now-. 

 Inner teeth well developed on each side as 3 large cusps, and medianly 

 above apparently as 2 smaller cusps. Posteriorly teeth form a hard 

 crescentic keel, apparently entire. Tongue apparently toothless, with 

 a median groove separating fleshy margin on either side. Inter- 

 orbital space rather narrowly convex. Skin thin, firm, not very 

 tough, and without evident mucous pores. Color faded in alcohol 

 uniform dull brown above and becoming a little paler on under surface. 

 Fins pale brownish, much paler than belly. Eye dull slaty. Length 

 4| inches. Type of Ammococtcs ccpytcra Abbott. 



In Proc. Acad. Nat. Sci. Phila., 1901, p. 328, following the previous 

 31 



