434 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
The type-specimen of Xenocarcinus tuberculatus of White, in the British 
Museum, has the appearance of having had a similar arrangement, the 4th 
pair of walking-legs is present and, though the 3rd pair is lost, the basipodites 
which remain suggest that the legs pointed more backward than in Miers’s 
figure (Miers, 1874, pl. 2. fig. 1). 
In the British Museum I find two unnamed males labelled “ 85.14. Aden, 
at low water. Presented by Major G. W. Yerbury.” In these the rostral 
horns are longer than in the present example, being more as in Paulson’s 
ficure. Rathbun (Joc. cit.) also finds the rostral horns longer in her ¢ than 
in her 2 specimen. The two British Museum specimens are of the same: 
size, C.l.11 mm.; the chelipeds are enlarged in both, being apparently of 
the type appropriate to breeding males. 
Family PARTHENOPID. 
Genus PanrtHEenopr, Fabricius, 1798. 
For non-recognition of Weber, 1795, and consequent non-acceptance of 
Daldorjia, Rath., 1904, see Stebbing, 1905 (2), p. 332. 
16. PARTHENOPE HORRIDA (Linweus, 1758). See Alcock, 1895, p. 279. 
Parthenope horrida, Alcock, loc. cit. 
Parthenope horrida, Nobili, 1906, p. 179. 
Parthenope horrida, Wlunzinger, 1906, p. 54. 
Parthenope horrida, Stebbing, 1905 (1), p. 27. 
Daldorfia horrida, Rathbun, 1906, p. 886, pl. 14. fig. 5. 
Daldorfia horrida, Rathbun, 1911, p. 259. 
Locality. Station VIII. E, 1 ¢ small [43]. 
Remarks. C.). 14 mm., C.b. 19:25 mm., C.l. + C.b. = °73, larger (right) 
Ch.J. 25°5 mm., smaller (left) Ch.l. 23°5 mm., the right and left chelipeds 
are thus respectively 1°82 and 1°68 the length of the carapace. 
The teeth on the upper margins of the meri of the walking-legs are. 
triangular. 
Inner, I 
Parthenope horrida, Q 43. Sternal hollow, 5 mm. across. 
The shape of the sternal hollow is shown in the accompanying text- 
figure. 
