438 MARINE BIOLOGY OF THE SUDANESE RED SEA, 
Genus Lupa, Leach, 1813. 
= Neptunus, de Haan, 1833. See Stebbing, 1902, p. 11, and 1908, p. 11. 
20. Lupa axcocki (Nobili, 1905). (Plate 44. figs. 1-le.) See Nobili, 
1906, p. 191. 
Neptunus (Hellenus) Alcocki, Nobili, loc. cit. 
Locality. Station I.B, 1 g [49]. 
Remarks. C.1. 8 mm.; ©.b. from tip to tip of the large 9th antero-lateral 
spines 16°25 mm., across the line of the angles between 8th and 9th antero- 
lateral teeth 12 mm.; Ch.]. 16 mm. ; propus |. (inner lower bord.) 8°75 mm. 
Of the three teeth on the outer surface of the wrist one is distal and spini- 
form and two are proximal and blunt. 
A point not referred to by Nobili is that there is a break in the salient 
crest of the large lateral spine where it curves back on the carapace towards 
the cardiac region. 
The chelipeds are of approximately equal length, but the right chela is the 
more massive. 
The only other example of this species recorded is the male with C.l. 
6°75 mm., which formed Nobili’s type-specimen and was taken at Djibouti. 
Genus CHARYBDIS, de Haan, 1833. 
= Gontosoma, A. M.-Edw., 1860; see Rathbun, 1897, p. 161. 
21. CHARYBDIS ERYTHRODACTYLA (Lam., 1818). See Nobili, 1907, p. 118, 
fig. 3. 
Charybdis (Goniosoma) erythrodactyla, Nobili, 1906, p. 194. 
Thalamita pulchra, Randall, 1840, p. 117, pl. 4; see Rathbun, Zoc. cit. 
Charybdis erythrodactyla, Rathbun, 1906, p. 872, pl. 4 (coloured). 
Locality. Station VII. B, 1 2 immature [50]. 
Remarks. C.1. 16°25 mm., C.b. (across the region of the Jast antero-lateral 
spines) 25 mm. 
Though the chelipeds are missing, and important characters are thus 
undeterminable, tlhe specimen appears evidently to belong to C. erythrodactyla, 
agreeing with the group of small specimens described by Nobili (1906, p. 195). 
There is granulation on the basal antennal joint both proximal and distal 
to the blunt laminar tubercle. 
Genus THALAMITA, Latreille, 1829. 
22. THALAMITA POIssONTI (Audouin et Savigny, 1826). See Alcock, 1899 (1), 
p. 81. 
Thalamita Poissonit, Alcock, loc. cit. 
Thalamita Poissonit, Nobili, 1906, p. 205. 
Thalamita Potssoni, Nobili, 1907, p. 120. 
Thalamita poisson, Laurie, 1906, p. 419. 
