78 



marked spines at the anterior superior angle of the eye ; in the 

 preopercular spine being larger ; and in the absence of the second 

 lateral line. 



From the P. CaroUnus, in having the strioe about the head 

 more rough, and in not having the extremities of the free rays of 

 the pectoral fins palmated. 



From the P. punctatuSf in the absence of the smoothness of 

 the strise over the head generally, and of the two small spines on 

 the side of the mouth, the one back of the lateral lobes of the 

 snout, and the other just above the angle of the jaws ; and of the 

 denticulations at the sides of the spines situated at the anterior 

 superior angle of the eyes ; by the less length of the pectorals 

 and by the emargination of the caudal fin. 



From the P. trihulus^ in the absence of the spine upon the sub- 

 orbitar bones ; in having the spines generally upon the head less 

 prominent and sharper, and in having the pectorals shorter in 

 proportion to the length of the body. 



A description of a new species of Argyreiosus, by Mr. J. 

 M. Batchelder, of Saco, Maine, communicated through Dr. 

 Storer, was read. 



Argyreiosus unimaculatus. Body nearly circular, much 

 compressed. Breadth l^^y inches. Profile nearly vertical. 

 Lower jaw the longer and hooked. Eyes -^^ of an inch in dia- 

 meter. A filament, ^ of an inch in length, arises on the back in 

 a vertical plane with the origin of the pectoral fin : -^^ of an 

 inch back of this, are three very minute spines. Several finlets 

 upon the back and abdomen. Pectoral fins -f-^ of an inch long. 

 Caudal fin deeply forked. 



Color, in parts above the lateral line, dark ; below it, silvery : 

 upon the lateral line, which passes in nearly a right line from the 

 superior angle of the gill covers to the base of the caudal rays, is 

 a nearly circular black spot, the anterior edge of which is just 

 touched by the pectoral fin when depressed. 



D. } P. ? V. ? A. ? C. 14 rays. Length 1^=^ inches to the 

 base of the caudal fin. 



The specimen above described, was taken, with six others, in 

 shallow water, on the beach at Saco, Maine. After having been 



