INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 577 



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

 group, until it can be determined to wliicli 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 

 Llitken, 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 

 lamellie 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. 



ISToGAGUS TENAX Steenstrup and Llitken. (p. 457.) 



Op. cLt., pp. 3S4, 3SS, 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 lamellae attached to its obliquely 

 truncated posterior angles. Length, 4.5"^^". 



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

 is perhaps the male of Echthrogaleus dentlcidatus^ with which it was asso- 

 ciated. Both species of Kogagus^ the Pandarus and UcJithrogaleus denticii- 

 latus, were, however, nil 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 c 



Pandarus 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. hicolor Leach, a European species, which is probably 

 not congeneric with the species which we have i)reviously mentioned. 



Cecrops Latreillii Leach, (p. 459.) 



Encyl. Brit., SuppL, vol. i, p. 405, PI. 20, 1316, (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 san-fish {Orthagoriscus mola) taken on the coast of Massachusetts. 



Anthosoma crassum Steenstrup and Llitken. (p. 4G0.) 



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

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

 Kroyer.) Antliosoma Smithii Leach, Encycl. Brit., Suppl., 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., PL 79, fig. 3 ; Baird, op. cit., p. 299, PI. .33, fig. 9. 



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

 S. Mis. 01 37 



