MAIOPSIS. 11 



The orbital region of A. h^strix does not differ from that of A. msouna 

 but for the presence of a prceocular spine, a character which by itself cannot 

 be considered of generic importance, as Mr. Miei-s admits.* Through hjsivix 

 we pass by a gentle transition to such species as umhonata, carpenteri, and 

 crassa (species placed in the genus Sci/rarnathiu), in which the orbit is better 

 defined through the projection of the brow. 



Thus the passage from the Inachine to the Maiine type is so gradual as 

 hardly to justify a family division such as is proposed by Mr. Miers.t In 

 the series of species, all of which are assigned to the genus Anamaikia, family 

 InachidLV, by jMr. Miers % {rissoana, hystrix, imlchra, crassa), we pass from the 

 strictly Inachine orbit of rissoana to an orbit like that of crassa, which is 

 practically the same as that of Ghorilia longipes, a species assigned by Miers 

 to the genus Hyastenus in the family Maiidce. 



The orbital region is subject to a great amount of variation even in a 

 single species ^A. umbonata), so that within the bounds of mere individual 

 variation the passage is made from the Inachine to the Maiine type of orbit 

 as exhibited in ChoriUa. § 



MAIOPSIS Fax. 

 Bull. Mus. Conip. Zool., XXIV. 150, 1893. 



Carapace subtriangular, as broad as long, spinose ; rostrum produced 

 anteriorly into two divergent horns with an accessory spine upon their 

 outer margins ; interorbital space broad. Eyes small, eyestalks slender, 

 retractile within the orbits. Orbits large, with a forward aspect, incomplete 

 below, the upper margin prominent, with two deep fissures, and supraocular 

 spines. Epistome short. Basal segment of antenna) very broad, with three 

 prominent spines upon its anterior margin ; flagellum of the antennte widely 

 separated from the cavity of the orbit by a broad process of the basal seg- 

 ment. Merus of outer maxillipeds notched at the antero-internal angle. 

 Legs of moderate length ; carpus of chelipeds elongated, not carinated ; chela 

 elongated and slender, fingers canaliculate within, but not spoon-shaped at 

 their tips, their prehensile edges meeting throughout most of their length, 



* Journ. Liim. Soo. Loudon, Zool., XIV. 658, 1879. 

 t Op. cit., p. 610. 



% Challenger Braohyura, p. 26, 1886. 



§ See M. J. Rattbun, Proc. U. S. Nat. Mus., XVII. 61, 62, Plate I., 1894. Cf. Pig. 3 (orbit of 

 A. jmbonat(i) with Fig. 1 (also A. umhonatci), and then cf. Fig. 1 with Fig. 5 (fihorilia longipes). 



