294 Aij7^es' Description of the 



At the origin of the caudal fin is a rather shallow depression 

 crossing the body, nearly half an inch in breadth ; the distance 

 from this depression to the termination of the vertebrae is nine 

 and three-fourth inches. The inferior portion of the tail pre- 

 sents two lobes ; the first is at the anterior extremity of the 

 fin, the height of which is three and three-fourth inches ; the 

 other is two inches from the end of the tail, the height of the 

 lobe being an inch and a quarter. 



I am not acquainted with any species to which this can be 

 considered very nearly allied. It differs in respect to the 

 teeth from almost all others of the genus and indeed corres- 

 ponds in this point more nearly with the characters of Scyl- 

 lium. That it cannot, however, belong to this latter genus is 

 apparent from the position of the first dorsal and from the 

 structure of the nostrils. 



Though the specimen from which my description was taken 

 was only forty-one inches in length, I am yet confident that 

 the species attains a much greater size. I have several teeth 

 which were taken from a shark caught on the south side of 

 the island ; they belong evidently to a fish of this species, and 

 judging from their relative size, the individual could not have 

 been less than seven feet long. 



The specimen figured was caught in the Sound, on the north 

 shore of Brookhaven, L. I. 



Gasterosteus millepunctatus. 

 Plate XII. Fig. 3. 



Entire length one inch and eight tenths ; greatest depth 

 four tenths of an inch ; depth at the insertion of the caudal 

 fin three twentieths ; depth, one fifth of an inch anterior to 

 the caudal fin, only a little more than one twentieth. Body 

 very thin on the back, but widening toward the abdomen, 

 where it is in some specimens three tenths of an inch in thick- 

 ness ; posterior to the origin of the anal fin the body is some- 

 what compressed. 



In color the sides show a ground of greenish olive, thickly 



