[577] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 283 



EchtlirogaleuSj &c., and are only provisionally retained in a separate 

 group, until it can be determined to wkicli of these genera the different 

 species really belong. This species is probably a Pandarus, and very 

 likely the male of the last species. 



Our specimens differ slightly from the figures given by Steenstrup and 

 LUtken, the dentiform prominences on the sides of the genital segment in 

 our specimens being much smaller than represented in their figures, the 

 segments of the tail somewhat shorter and broader, and the terminal 

 lamellae also shorter and broader, while in other respects they agree well. 

 Steenstrup and Liitken s specimens were taken from sharks caught in 

 latitude 31 north, longitude 76 west, (in the Gulf Stream, off the South 

 Carolina coast,) and in latitude 40 south, longitude 31 west, while 



Leach s came from latitude 1 south, longitude 4 east. 







NOGAGUS TENAX Steenstrup and LUtken. (p. 457.) 



Op. cit., pp. 384, 388, PJ. 10, fig. 20, 1861. 



Vineyard Sound, with the last species, upon AtwootVs shark. It has 

 nearly as extended a range as the last species. 



It is very different from the last species, having the branches of the 

 posterior pair of natatory legs each composed of a single segment, and 

 the tail also composed of a single segment, which is broader than long, 

 and has the short, truncate caudal lamellre attached to its obliquely 

 truncated posterior angles. Length, 4.o mm . 



This species probably belongs to a different genus from the last, and 

 is perhaps the male of Eckthrogalens denticulatus, with which it was asso 

 ciated. Both species of Nogagus, the Pandarns and Eohthrogaleus denticu- 

 latiiSj were, however, all found on the same specimen of the shark, so 

 that the association of males and females in one or two instances is not 

 very good proof of their identity. 



S SINUATUS Say. (p. 459.) 

 LOG. cit., p. 436, 1818. 



This species is apparently, as far as can be judged from Say s descrip 

 tion, allied to P. licolor Leach, a European species, which is probably 

 not congeneric with the species which we have previously mentioned. 



CEOROPS LATREILLII Leach, (p. 459.) 



Encyl. Brit., Suppl., vol. i, p. 405, PL 20, 1816, (teste Edwards et al. ;) Edwards, 

 Hist. nat. des Crust., tome iii, p. 475; Baird, op. cit., p. 293, PI. 34, figs. 1, 2. 



According to Gould, (op. cit., p. 341,) this species has been found upon 

 the sun-fish (Orthagorlscus mola) taken on the coast of Massachusetts. 



ANTHOSOMA CRASSUM Steenstrup and LUtken. (p. 4GO.) 



Op. cit., p. 367, PI. 12, fig. 24, 1861. CaUgus crassus Abildgaard, (teste Steen 

 strup and LUtken,) Naturh. Selsk. Skr., Bind iii, p. 49, pi. 5, [1794 ?] (teste 

 Kroyer.) Anthpsoma Smithii Leach, Eucycl. Brit., Snppl., vol. i, p. 406, PI. 20, 

 1816, (teste Edwards et al. ;) Kroyer, Nat. Tidsskrift, vol. i, p. 295, PI. 2, fig. 

 2, 1836 ; Edwards, Hist. nat. des Crust., tome iii, 493, PI. 39, fig. 5 ; Regne ani 

 mal de Cuvier, Crust., PI. 79, fig. 3 ; Baird, op. cit., p. 299, PI. 33, fig. 9. 

 According to Gould, (op. cit., p. 341,) Anthosoma Smithii has been 

 20 v 



