Vol. XXIX. pp. 25-26 February 24, 1916 



PROCEEDINGS 



or THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTION OF A NEW CISCO FROM LAKE ERIE, 

 BY TARLETON H. BEAN. 



On September 21, 1915, Mr. Phillip H. Hartman, Superin- 

 tendent of the State Hatchery at Erie, Pa., showed the writer a 

 Cisco which he had obtained from a Lake Erie fisherman, and 

 which he has recently sent to me for description. The fish is 

 so remarkable in the development of its fins as to raise a question 

 concerning its relation to the normal forms of Lake Herring of 

 the Great Lakes. The pectorals extend beyond the origin of 

 the ventrals. The ventrals reach beyond the end of the anal 

 base. The longest anal ray exceeds the depth of the body. 

 The longest dorsal ray is more than one-third of the length of 

 the fish without caudal. 



Leucichthys macropterus new species. 



The type of the species, an immature male, is 244 millimeters long 

 without the caudal. D. 11; A. 11; scales 8-74-8; scales between occiput 

 and dorsal fin 34; branchiostegals 8; gillrakers 8+22, the longest equal 

 to eye; head 4.28 in length; depth 4; length of caudal peduncle 10.5; 

 depth of caudal peduncle 12; eye 4% in head; long diameter of orbit 

 equals distance from tip of snout to eye, 4 in head, and about equal to 

 interorbital space; length of maxilla from tip of snout 3 in head; 

 mandible very slightly projecting, 2)4 in head ; distance from snout to 

 occiput twice length of maxilla. 



Distance from ventral origin to pectoral origin five-sixths of pectoral 

 length; length of pectoral one and two-thirds times head. Length of 

 ventral nearly twice length of head. Accessory ventral about equal to 

 maxilla. The longest dorsal ray one and one-half times head. 



The length of the base of adipose dorsal is only slightly greater than 

 the height of the fin, and is not equal to the eye. The longest anal ray 

 somewhat exceeds depth of body. The lower caudal rays longest, equal- 

 ling length of pectoral. 



7— Proc. Biol. Soc. Wash.. Vol. XXIX, 1916. (26) 



