1895.] A. Alcock — Carcinological Fauna of India. 185 



most of the appendages thickly setaceous, and densely encrusted with 

 sponges, zoophytes, algte, etc. Rostrum broad, extremely short, some- 

 what deflexed, slightly emarginate. 



Eye-stalks long, recurved, retractile to the sides of the carapace, 

 and towards a slender acute post-ocular spine. Owing to the imperfec- 

 tion of the rostrum the interantennulary spine is not developed, so that 

 both the antennules fold into a common chamber. 



The antennae, which are completely exposed from the base of the 

 2nd joint, have the basal joint long and slender, and the free joints of 

 the peduncle flat and densely setaceous. 



The hairy external maxillipeds have the an tero- internal angle of 

 the ischium produced into a long narrow lobe, parallel to the narrow 

 meropodite. 



The chelipeds in both sexes are slender and are about equal in 

 length to the carapace : in the male they are stouter than in the female, 

 and also differ in having the palms inflated : the fingers in both sexes 

 are closely apposable and are toothed throughout. 



The other trunk-legs increase in length from the 2nd pair (which 

 are a little longer than the chelipeds) to the 4th pair (which are twice 

 as long as the chelipeds) : the 5th pair, again, being only as long as the 

 3rd pair. 



The abdomen in the adults of both sexes is broad and sub-circular, 

 almost entirely covering the sternum, and consists of seven separate 

 segments. 



In the Museum collection are adult males and egg-laden females 

 from the Andamans, Oocos, Ceylon and Samoa — the last being from the 

 collection of the Museum Godeffroy. 



Alliance II. Inachoida. 



Inachoides, Edw. & Lucas. 



Inachoides, Milne-Edwards and Lucas, in D'Orbigny Voy. Amer. Merid., Crust, 

 pp. 4 & 5. 



Inachoides, Miers, Journ. Linn. Soc, ZooL, Vol. XIV. p. 646. 



Inachoides, A. Milne-Edwards, Miss. Sci. Mex., etc., Crust., etc., I. p. 19S. 



Carapace pyriform much narrowed in front, inflated behind, the 

 regions well delimited. Rostrum simple. Eyes not, or slightly, retrac- 

 tile towards the sides of the carapace; never, in any position, concealed. 

 Pre-ocular and post-ocular spines distinct — especially the latter. 



Basal antennal joint long and slender : its antero-external angle 

 visible from above, on either side of the rostrum, as an acute spine : 



