68 



Acad. Coll. signifies tliat specimens are in the Maryland 

 Academy of Sciences. 



S. I. Specimens are in the Smithsonian Institution, at 

 Washington. 



Fins. — D. Dorsel, i. c, on tlie hack; sometimes 2 in nam- 

 l)er. 



r. Pectoral; attached hehind the gill-covers. 



V. Ventral; attached to the lower side in front. 



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



C. Caudal; the tail fin. 



