RATHBUN— MARINE BRACHYURA 



249 



The carapace of these specimens is very smooth, there being only an enlargement 

 on the outer margin of the branchial region, while the gastric and cardiac regions are 

 separately tumid. Rostrum strongly tapering (most slender in b), but spreading again 

 at the horns. A minute spinule in advance of the eye and two spinules on the basal 

 antennal joint, one at the angle, the other behind it ; 3 or 4 spinules on pterygostomian 

 region. The projections on upper border of arm and merus joints of legs are spinules 

 except for 1 or 2 nodules on the last pair. 



211. Sphenocarcinus cuneus (Wood-Mason). 



Sphenocarcinus cuneus Alcock (l), p. 193 ; Illus. Zool. Investigator, Crust., pt. iv, 

 1896, pi. 21, figs. 1, 1 a. 



Providence, 70 fins., Sta. D 7 ; 1 ? ovigerous. 



Dimensions in mm.: CI. 27 '2 ; rostrum (from anterior margin of orbit) 13 "2. 



Cardiac islet transverse, more than twice as wide as long ; inner margin of branchial 

 islet deeply concave at middle third ; these islets have very much the shape of those in 

 OxypleuTodon stimpsoni Miers*. The carinas on the legs ascribed to the species are, in 

 this specimen, evident on the carpal segments as blunt ridges, on the meral and pi*opodal 

 segments they are very obscure ; this may be due to the greater size of the specimen. 



212. Huenia proteus (de Haan). 



Huenia proteus Alcock (l), p. 195. 



Amirante, 25 — 80 fms., Sta. Ell; 2 $ (each with a Rhizocephalid parasite rilling the 

 abdomen): 20 — 25 fms., Sta. E 13 ; 3 $ (one small, with relatively large Rhizocephalid 

 parasite). Seychelles, 34 fms., Sta. F 8 ; 2 $, 1 ? (the latter with Rhizocephalid parasite 

 filling the abdomen). 



The males resemble most fig. 4, on pi. 4 of Adams and White's " Crust. Samarang," 

 while the females are of the form of fig. 6 of the same plate. 



213. Simocarcinus simplex (Dana). 

 Simocarcinus simplex Alcock (1), p. 196. 



Coetivy ; 1 $. C. 1. 10 mm., rostrum (from anterior border of orbit) 3 "7 mm. 



Three tubercles on gastric region; a lobe at either end of posterior margin of carapace. 

 Rostrum straight and horizontal. Chelipeds feeble. 



214. Meneethius monoceros (Latreille). 



MencBthius monoceros Alcock (l), p. 197. 



Diego Garcia, 14 fms.; 1 $. Cargados Carajos, reef; 1 ? immature. Saya de Malha, 

 29 fms., Sta. C 19; 1 ? with Rhizocephalid. Peros, Coin; 1 ?. Salomon; 1 £ immature. 

 Egmont, lagoon, 6 — 7 fms.; 1 $. Amirante, 25 — 80 fms., Sta. Ell; 4 £, 3 ?. Seychelles, 

 31 fms., Sta. F 2 ; 1 $, 1 $ with eggs : 34 fms., Sta. F 8 ; 1 $, 1 ? with eggs. Praslin, 

 reef; 3 ?. 



* Challenger Brachyuni, 1886, p. 38, pi. 6, tigs. 1 — 1 c. 



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