RATHBUN— MARINE BRACHYURA 247 



206. Achceopsis thomsoni (Norman), var. 



Lispognathus thomsoni Doflein, Brachyura " Valdivia," 1904, p. 75, and synonymy. 



Saya de Malha, 300—500 fms., Sta. C 20 ; 1 $, adult. 



This specimen has parallel horns about \ as long as remainder of carapace. It differs 

 from typical specimens in having the anterior gastric and anterior branchial spines obsolete 

 or reduced to low tubercles. 



The species is very close to A. spinulosus Stimpson* which has shorter legs, described 

 as "minutely spinulous above," but there is no indication, in description or figure, of 

 the terminal spine on the merus joints. A. spinulosus is an inhabitant of shallower 

 water (10 fathoms in Simons Bay, Cape of Good Hope). 



207. Oncinopus aranea de Haan. 

 Oncinopus aranea Alcock (1), p. 183. 



Cargados Carajos, 30 fms., Sta. B 14 ; 1 ? : 30 fms., Sta. B 23 ; 1 $. Providence, 

 50—78 fms., Sta. D 4 ; I ?. Amirante, 34 fms., Sta. E 9 ; 2 $ : 25—80 fms., Sta. Ell; 

 4 t, 6 ? (2 ovig.): 20—25 fms., Sta. E 13; 1 $, 1 g: 30 fms., Sta. E 21 ; 1 ?. Seychelles, 

 39 fms., Sta. F 3 ; 1 $, 2 ? (1 ovig): 39 fms., Sta. F 4 ; 1 ? : 34 fms., Sta. F 8 ; 4 $, 3 <j> 

 (1 ovig.): 37 fms., Sta. F 9 ; 1 $, measuring 9"3 mm. long in the carapace. 



The unbroken antennas in one case measure ^ length of carapace ; the slender flagellum 

 is often broken off near the peduncle. 



208. jEpinus indicus (Alcock). 



Apocremnus indicus Alcock (l), p. 188, pi. 4, figs. 2, 2 a. 



Amirante, 22 — 85 fms., Sta. E 10 ; 1 $, mature, with the abdomen filled with a 

 Rhizocephalid parasite. Seychelles, 39 fms., Sta. F 3 ; 1 $, immature. 



In both these specimens the postocular spine is present; there is no cardiac spine, but 

 a tubercle in its place ; a low blunt gastric spinule or tubercle ; the 7 segments of the 

 abdomen (?) are distinct. 



Pseudocollodes, gen. nov. 



Carapace subtriangular. Rostrum short, bifid. An interantennular spine, visible 

 from above. Eyes retractile against a strong postocular tooth. Basal antennal joint very 

 narrow, spinous, less advanced than rostrum. Maxillipeds fitting loosely in buccal cavity. 

 Merognath elongate-oval, narrower than ischiognath, the latter strongly advanced at its 

 inner angle. Chelipeds of moderate size. First pair of legs extremely long ; remaining 

 legs diminishing rapidly in length ; dactyli elongate. In both sexes the last 2 segments 

 of abdomen are fused. 



Type, Pseudocollodes complectens, sp. nov. 



This genus differs from Collodes Stimpson f in its interantennular spine, form of 

 merognath, greater length of first leg, in the 6 instead of 5 abdominal segments of the $ ; 

 from Euprognatha Stimpson+ in the lesser prominence of the basal antennal segment and 

 the form of the maxilliped. 



* Smithson. Misc. Coll., xlix. 1907, p. 21, pi. 3, figs. 5, 5 a. 



t Ann. Lye. Nat. Hist. N. Y., vii. 1860, p. 193. J Bull. Mus. Corap. Zool., ii. 1871, p. 122. 



SECOND SERIES— ZOOLOGY, VOL. XIV. 32 



