i8o 



Goniocaphyra trtmcatifrons it are the posterior teeth that are the larger. The carapace is 

 regularly vaulted, both longitudinally and transversely. 



To the 9 points of difference enumerated by Miss Rathbun it may be allowed to add 

 a tenth, viz. the .shape of the external maxillipeds. The latter are rather elongate and slender 

 in C. nitidus (fig. i,b), the ischium is distinctly longer than broad, as is also the merus, the 

 latter is only slightly produced at its antero-external angle, and on the whole I find an almost 

 complete agreement with de M.\n's figure \a. In C. iiiaequalis on the- other hand the external 

 maxillipeds (fig. 5<5) are much broader, ischium and merus being both broader than long, and 

 the antero-external angle of the latter is greatly produced outward. The horny hairs at the 

 dactylus of the palp are much more finely pectinate in C. iiitidus than in the other species. 



The elongate meropodite of the cheliped bears a proximal and a distal spine in my 

 specimen of C. nitidus; in the other species the anterior margin of the meropodite is regularly 

 crenulate. The left (smaller) chela in my cf of C. nitidus wholly resembles the equal chelae 

 of the 9 of Miss Rathbun's species in that the palm is low, rounded and as long as the fingers, 

 but the cutting margin of the immovable finger bears more prominent, triangular teeth in the 

 former species, and is not finely serrulate between these teeth, as in C. ifiaequalis (see fig. 5^). 

 The right chela of C. nitidus is larger, the palm is longer than the fingers, the latter are high, 

 not gaping, and the cutting margins are provided with a few very broad, but low, teeth. 



The present species is recorded from Samoa, Fiji Isles, Noordwachter Island near Batavia, 

 Amboyna, Ceylon, Mauritius, Amirante and Coetivy. 



Dimensions in mm. : 



Length of carapace 



Greatest breadth of carapace (just before posterior lateral teeth) 



6.75 2.2 



9.75 I 3.16 



Milne-Edwards' very large specimen (breadth of carapace no less than 23 mm.) ranks 

 foremost in size among all other recorded examples. 



2. Catoptrics inaeqtialis Rathbun. PI. 9, Fig. 5. 



1906. Goniocaphyra inaequalis Rathbun. Bull. U. S. Fish Comm. for 1903, v. 23, p. 870, 



textfig. 29, pi. 12, f. 9. 

 1906. Catoptriis nitidus (part) Laurie. Rep. Pearl Oyster Fish. Ceylon, prt 5, p. 422. 

 191 1. Catoptrus inaequalis Rathbun. Transact. Linn. Soc. London (2), v. 14, p. 239. 



Stat. 1 16. West of Kwandang Bay entrance, north coast of Celebes. Depth 72 m. i 9. 



Between this and the preceding species numerous points of difference are already mentioned : 

 the carapace is proportionately broader, the shape of the lateral teeth is different, the middle 

 teeth on either side being the most prominent, the external maxillipeds are much more oper- 

 culiform. We may add that, as Miss Rathbun remarks, the infra-orbital marg-in is entire and 

 not armed with three denticles, as in the preceding species, that the supra-orbital margin passes 

 with a right angle into anterior margin of front (fig. 5«), and that the eye-stalks are not 

 thickened at the base and provided with a small knob near the cornea, at the anterior side, 

 as in C. tiitidus (fig. 4^7), but simply cylindrical. 



32 



