22' 



With the preceding genus the present one is distinguished by the epistome being sunken, 

 not at all prominent, so that the external maxillipeds nearly encroach upon the antennulae, 

 which latter are very minute, and directed almost longitudinally. The merus of the external 

 maxillipeds is almost circular, distinctly smaller than the ischium, the palp is weak and 

 short, inserted at the antero-internal angle of the merus and the exognath is very narrow, 

 betvveen one-third and one-fourth the breadth of the ischium. Ej-es are not or scarcely visible 

 and their peduncles are firmly fixed. 



The type species is the Atlantic T. intcgrifrons (Miers '), which in two essential features 

 differs from the three species of the "Siboga": firstly the flagellum of the antennulae of Miers' 

 species is m u 1 1 i - a r t i c u 1 a t e , hairy and 1 o n g e r than the peduncle, whereas in the Indian 

 specimens this flagellum is shorter than the peduncle, almost completely hairless, and made 

 up of very few (5 — 6) joints; secondly in T. intcgrifrons the abdomen does not entirely 

 cover the last sternal segment, but in my specimens it touches the bases of the last pair of legs"). 



.BoRRADAiLE first founded a genus incertae sedis, Caecopihwinus, for the reception of a 

 species, which was provisionally ranged among the Xanthidae, but afterwards') he recognized 

 that his genus was "at least allied to, if not identical with, TypJilocarcinodes Alcock'". 



The genus Epinielus A. Milne-Edwards *) is certainly very nearly related to Typhlocar- 

 cinodes. A co-type of the single species, £. cessaci, is in the Leiden Museum. It is nearest to 

 T. hirsutus (Borradaile), with which it agrees in the strong granulation of the carapace and 

 the lobulation of its lateral margins, in the shape and disposition of antennulae and antennae 

 and in the rather long first abdominal segment, which covers all the space between the last 

 pair of legs. That the genera are not to be considered identical is proved by the following 

 facts: in Epimclits the eye-stalks are mobile, c)lindrical, as long as the breadth 

 of the front at its base, and provided with a nor mal eye at the tip; a rather 

 large distance back from the cornea, a spot of pigment is shining through the tegument; secondly 

 the merus of the external maxillipeds is not subcircular, but distinctly rectangular. 



The "Siboga" obtained several specimens of the genus, belonging to at last two species. 

 One of these is the " Caecopilumnus hirsutus' of Borradaile, another specimen is ''Typhlo- 

 carcinops' piroculata Rathbun. That Miss Rathbun's species in reality does belong to the 

 present genus and not to Typhlocarcinops I hope to explain further on. Whether a third species, 

 unfortunately only represented by a single 9, has a right of existence, remains uncertain as 

 long as no further material is available. 



Key to the Indo-Pacific species: 

 I. Carapace granulate, with regions more or less conspicuously 

 indicated, little broader than long. Anterior margin of front 

 rounded, lateral angles absent. Walking legs short and broad, 



1) L. c, p. 260, pi. 14, f. I. Hab. Goiee Island, Senegambia. 



2) It must be remarked, however, that Alcock, who examined a much damaged specimen, expressly states that the abdomen 

 is naiTower than the space between the last pair of legs. 



3) Fauna Geogr. Maldive and Laccadive Arch., v. I, 1903, p. 431. 



4) Buil. Sec. Philom. Paris (7), t. 2, 1878, p. 227; Exp. "Travailleur" et "Talisman", Brachyures et Anomoures, 1900, p. 76, 

 pi. 15, f. I — 8. Hab. Cape Veide Islands, depth 10 — 30 metres. 



79 



