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



ij c., and are only provisionally retained in ;i ,s-p;i 

 group, until it can be determined to which of these genera the difiV-n-nt 

 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 Steonstnip and 

 Liitkeu, 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 

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

 Steenstrup and Llitken'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, PI. 10, fig. 20, 1861. 



Vineyard Sound, with the last species, upon Atwood's 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 lamellne attached to its obliquely 

 truncated posterior angles. Length, 4.5 ram . 



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

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

 ciated. Both species of Nogagus, the Pandarus and Eehthrogaleus denticu- 

 latus, 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. 



PANDARUS SINUATUS Say. (p. 459.) 



Loc. cit., p. 436 7 1818. 



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

 tion, allied to P. Mcolor 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, PI. 20, 1818, (teste Edwards et al. ;) Edwards, 

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

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

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



ANTHOSOMA CRASSUM Steenstrup and Lutken. (p. 460.) 



Op. cit., p. 367, PL 12, fig. 24, 1861. Caligus cmssus Abildgaard, (teste Steeu- 

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

 Kroyer.) Antliosoma Smithii Leach, Eucycl. Brit., Suppl., vol. i, p. 406, PL 20, 

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

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

 mal de Cuvier, Crust., PL 79, fig. 3 ; Baird, op. cit., p. 299, PL 33, fig. !>. 

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

 20 v 



