Expiiiiiiitioiis and Abi*eviatiou!<>. 



Acad. Coll. .-■.ignilJes that specimens are in tUe Jlaryland Aeaileniy orScienres 

 S. I. Specimens are in the Smithsonion Institution, at Washington. 

 Fins. — D. Uorsal^ i, c on the back; sometimes 2 in number. 



P. Pectoral; attached behind the gill-coverf:. 



"N'. Ventral: attached tn the lower side in tVont. 



A. Anal; attached to the belly near the vent. 



C Caudal; the tail fin. 



