[577] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 283 
Echthrogaleus, &ec., and are only provisionally retained in a separate 
group, until it can be determined to which 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 
Liitken, the dentiform prominences on the sides of the genital segment in 
our specimens being much smaller than represented in their figures, the 
seginents 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 Liitken. (p. 457.) 
Op. cit., pp. 384, 334, Pl. 10, fig. 20, 1881. 
_ 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 lamelle 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 Hchthrogaleus denticulatus, with which it was asso- 
ciated. Both species of Nogagus, the Pandarus and Hehthrogaleus denticu- 
latus, were, however, all found on the same specimen of the shark, so 
that the association of males and femnles in one or two instances is not 
very good proof of their identity. 
PANDARUS SINUATUS Say. (p. 409.) 
Loe. cit., p. 436, 1818. 
This species is apparently, as far as can be judged from Say’s descrip- 
tion, allied to P. bicolor Leach, a European species, which is probably 
not congeneric with the species which we have previously mentioned. 
CEcROPS LATREILLI Leach. (p. 459.) 
Encyl. Brit., Suppl., vol. i, p. 405, Pl. 20, 1815, (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 Liitken. (p. 460.) 
Op. cit., p. 367, Pl. 12, fig. 24, 1861. Caligus crassus Abildgaard, (teste Steen- 
strup and Liitken,) Naturh. Selsk. Skr., Bind iii, p. 49, pl. 5, [1794 ?] (teste 
Kroyer.) <Anthosoma Smithii Leach, Encycl. Brit., Suppl., vol. i, p. 406, Pl. 20, 
1816, (teste Edwards et al. ;) Kroyer, Nat. Tidsskrift, vol. i, p. 295, Pl. 2, fig. 
2, 1836 ; Edwards, Hist. nat. des Crust., tome iii, 493, Pl. 39, fig. 5; Regne ani- 
mal de Cuvier, Crust., Pl. 79, fig. 3; Baird, op. cit., p. 299, Pl. 33, fig. 9. 
According to Gould, (op. cit., p. 341,) Anthosoma Smithii has been 
20 Vv 
