194 
THE VOYAGE OF H.M.S. CHALLENGED. 
The species never attain a very large size, and occur very commonly throughout the 
Indo-Pacific region, and also less frequently on the eastern shores of the Atlantic, and 
only, I believe, in shallow water (to 20 fathoms). Many are separated by characters of 
slight importance, and Dr. R. Kossmann, 1 goes so far as to unite, under the single 
designation Thalamita prymna, all the species with eight-lobed front ( Thalamita 
prymna, Thalamita stimpsoni, Thalamita picta, Thalamita spinimana, Thalamita 
coeruleipes, Thalamita crenata, Thalamita danse), which are distinguished by A. Milne 
Edwards in his Monograph, several of which, in the present Report, are retained, pro- 
visionally at least, as distinct. 
The following are species which have been described since the publication of A. Milne 
Edwards’ Report on the Portunidse : — 
Thalamita speciosa, Miers. Samoan Islands. 
Thalamita hellerii, Hoffmann. Madagascar ; Nossy F aly Island. (Perhaps a 
variety of Thalamita crenata.) 
Thalamita integra, var. africana, Miers. Canary Islands ; Goree Island, Sene- 
gambia, 9 to 15 fathoms. 
Thalamita quadrilobata, Miers. Seychelles, 4 to 12 fathoms. 
Thalamita intermedia, n. sp. Torres Strait. 
Thalamita sexlobata, n. sp. Tongatabu, off Nukalofa, 18 fathoms. 
§. Thalamitse ivith Four-lobed front. 
Thalamita admete (Herbst). 
Cancer admete, Herbst, Naturgesch. der Krabben u. Krebse, iii. Heft, iii., p. 40, pi. lvii. 
fig. 1, 1803. 
Thalamita admete, Latreille, Crust, in Rcgne Animal de Cuvier, ed. 2, vol. iv. p. 33, 1829. 
,, „ Milne Edwards, Hist. Nat. Crust., vol. i. p. 439, 1834; Regne Animal de 
Cuvier, ed. 3, Crust. Atlas, pi. ix. fig. 2 (?). 
„ „ A. Milne Edwards, Arcbiv. Mus. Hist. Nat., vol. x. p. 350, 1861. 
Levuka, Fiji Islands (on the reefs), a small female. 
In this specimen the chelipedes are slender ; the fourth antero-lateral tooth, although 
smaller than the rest, is yet well developed. The ambulatory legs are prettily banded 
with fuscous brown. 
Two males obtained at Tongatabu, on the reefs, approach the variety designated 
Thalamita savignyi by A. Milne Edwards, in having the palms of the chelipedes 
granulated between the spines of the upper surface. 
Adult $ . Lines. Millims. 
Length of carapace (of the largest specimen), . . . . 8-|- 18 
Breadth of carapace, . . . . . . . 14| 31 
1 Malacostraca.in Zool. Ergebn. einer Reise Kustengeb. d. rothen Meeres, p. 47, 1877. 
