Occasional occurrence of tropical and sub-tropical species 

 OP Decapod Crustacea on the Coast of New England. 

 By S. I. Smith. 



Some years ago I called attention to the occurrence of the young 

 of a southern species of Ocypode on the south shore of Long Island 

 and the coast of southern New England, and more recently Mr. Faxon 

 has recorded the similar occurrence, at Newport, Rhode Island, of 

 Polyonyx macrocheles and, incidentally, of Calappa marmorata. 

 Since my first observations were published a considerable number of 

 new observations have been made and additional species have been 

 found to occur in a similar way, so that it seemed desirable to bring 

 together all the observations with the view of calling special attention 

 to the subject. This is attempted in the following list which includes 

 all the tropical and sub-tropical species which are known to me to 

 occur, in any stage of the adult form, on the New England coast. 

 The pelagic species which I have mentioned as found near the borders 

 of the Gulf Stream, off St. George's Banks (these Transactions, vol. 

 iii, p. 26; vol. v, pp. 120-122), are doubtless all regular inhabitants 

 of the Gulf Stream even much north of New England, and all prob- 

 ably occur occasionally on the coast of southern New England, but 

 only those which have actually been observed in the bays and sounds 

 along the coast itself are included in the list. Of the species includ- 

 ed, Nautilograpsus minutus, Neptunus Sayi, and Latreutes ensif- 

 erus belong to the pelagic fauna of the Gulf Stream. The others 

 are all southern species which either drift north in the free-swimming 

 early stages and partially complete their development on our coast, 

 like Ocypode quadrata and Polyonyx niacroeheles, or are accident- 

 ally carried north in some stage of the adult form and survive for a 

 short time in summer, like Pachygrapsus transversiis. I have not 

 intended to include any species which could, in any sense, be regarded 

 as properly belonging to the fauna of the New England coast. 



Ocypode quadrata J. c. Fabricius. 



Cancer quadratus J. 0. Fabricius, Eatomologia Systematica, ii, p. 439, 1793 (diag- 

 nosis ; " Habitat in Jamaica Mus. Dom. Banks.") 



