516 COLLECTIONS FKOM THE WESTERN INDIAN OCEAN. 



Glorioso Islands. Beach and reef at low water, May 1882 (No. 220) ; 



7-10 fms., sand and mud, May 1882 (No. 219). 

 Mozambique.. Beach, between tide-marks, May 1882 (Nos. 224, 225, 



227) i specimens found in the interior of Tridacna-sbeils (No. 237). 



In. the systematic list of the species which follows, 104 species 

 and varieties are enumerated from the African suhregion, besides 

 13 which were collected at Singapore and are not included in 

 this Eeport; of these, 16 species and 6 varieties are described as 

 new to science. 38 species and varieties are indicated as new to 

 the African subregion ; but several of the new varieties may not 

 imjprobably have been already recorded by previous writers under the 

 typical designation of the species. 



Little need be said with regard to the geographical distribution 

 of the species, since the great majority, except in the groups Oxy- 

 rhyncha and Oxystomata (which are richest in undescribed forms), 

 are common in the Indo-Pacific region*, but confined, with few 

 exceptions, to that area of distribution. Such exceptions are Grapsus 

 maculatus, Liolophus planissimus, Alpheus edwardsii, and Qono- 

 dactylus ehiragra, which extend into the Atlantic region; also 

 Thalamita Integra and Calcvppa gallus, var. bietirnis (it the distri- 

 bution of the variety be included in that of the tyjrical form). It 

 is not necessary to repeat here what has been already noted on the 

 affinity of the Crustacean fauna of this subregion or district with 

 that of the West Indies f. 



List of the Species, showing their Geographical Range, 



[N.B. The species and varieties distinguished by an asterisk are those which 

 I believe to be now recorded for the first time from the Mascarene subregion 

 and the Eastern coast of Africa. The term " Oriental Eegioli " denotes that 

 the species ranges from the African coast or islands adjacent eastward at 

 least to one of the island-groups of the Pacific Ocean. At the end of this 

 Eeport a table is appended, snowing the distribution of the species on the 

 East-African coast and the islands belonging to the same geographical sub- 

 region.] 



PODOPHTHALMIA. 

 Decapod A. 



BftACHTUEA. 



*Ach<Bm liBviocuUa, sp. n. Seychelles. 

 Camposcia retusa, Latreille. Mozambique ; Oriental Region. 



* Prof. P. W. Hutton, in a recent article on Zoological Q-eography, adopts 

 the terms ProTince and District for marine geographical diviaions in contra- 

 distinction to the terms Eegion and Subregion, which he restricts to the land 

 divisions {vide ' New Zealand Journal of Science,' i. p. 199, footnote, 1882). 



t Proc. Zool. Soo. p. 539 (1882). ' 



