248 S. I. Smith — Species of Pintiixa 



A number of individuals of each form were examined and carefully- 

 reared in separate vessels. Two individuals of the long-spined form 

 lived through the last zoea molt and came out in the early stage of 

 the adult form, as well described by Mr. Faxon. Of the short-spined 

 form a single individual was reared through the final zoea molt, and 

 came out a megalops. I was not able during the season of 1875 to 

 rear either the megalops or the young crab through another luolt, or 

 to repeat the former observations. 



Though these observations were very remarkable, I wished to com- 

 plete and confirm them, and, if possible, to determine to what partic- 

 ular species the two forms of zoea belonged, and so the publication 

 of the observations was postponed; but no opportunity for complet- 

 ing them occurred, and in 1878 Mr. Faxon, though wholly ignorant 

 of my observations, fortunately repeated the observations upon the 

 long-spined zoea and published the results, together with a brief 

 statement of my observations, and gave figures of the zoeoe which I 

 obtained from the adult Phinixa at Noank, Conn., in 1874. Mr. 

 Faxon identified the adult Pinnixa, like those from which the zoeae 

 were obtained, with P. chmtopterana of Stimpson, and, in his paper 

 referred to, is the first to record the occurrence of this species on 

 the New England coast. 



During the summer of 1879 Prof. H. E. Webster obtained a large 

 nmnber of specimens of Pinnixa (which was before not known north 

 of Cape Cod) at Wellfleet, on Ca2:)e Cod Bay, and sent them to me 

 for identification. While examining these I have reexamined the 

 specimens previously obtained on the New England coast, in all be- 

 tween 60 and 70 specimens, and I find there are two quite distinct 

 species among them. As indicated by these collections, by far the 

 most common species is P. climtopterana Stimpson, and among the 

 specimens taken by Prof. Webster in Cape Cod Bay, this is the only 

 species represented. From Vineyard Sound, Buzzard's Bay, and 

 Long Island Sound, however, there are a few specimens of a different 

 species, the one which I have figured and referred to as P. cylindrica 

 (Say sp.) It is apparently not Say's species, however, but the spe- 

 cies described by Stimpson as P. Sayana. Stimpson appears to have 

 had only males and his specimens were dredged in 6 fathoms, off the 

 mouth of Beaufort Harbor, North Carolina. The distinctive features 

 of these two species are pointed out further on. 



Having ascei'tained that the adults of two species of Pinnixa in- 

 habit the NcAV England coast, it is a matter of considerable interest 

 to determine whether either or both of these are the same as either 



