Carcinological Panva of India. %^ 



5-8. Botilla afinis., n. sp. 



Differs from D. sulcata, with specimens of which, from the Red 

 Sea, I have compared if, only in the follo\viii<^ characters : 



(1) there 18 no spine on the under surface of the arm, (2) the 

 fingers are not so long as the pahu, (3) there is a small tympanum on 

 tlie dorsal surface of the merus of the last pair of legs, whereas in 

 D. sulcata only the tympanum on the ventral surface is present. 



The carapace behind the gastric and inside the brancliial regions, 

 forms a smooth semicircular facet, but all ifs anterior and lateral 

 regions have a curiously convoluted sculpture, the convexities of the 

 convolutions being finely graimlar. 



The grooves that define these convolutions form, when viewed ns a 

 whole, a sort of five-rayed star, the anterior ray (wliich runs up 

 between the eyes on to the front) being the shortest, the anterolateral 

 rays (which run towards the outer angles of the orbit) being a little 

 longer, and the postero-lateral rays (which really are triple) being the 

 longest of all. 



The pterygostomian regions and neighbouring part of the side- 

 walls of the carapace, and the meropodites of the external maxillipeda 

 have the same curious convoluted sculpture. Tlie orbits are shallow 

 but aie perfectly defined. 



. The merus of the external maxillipeds is more than twice the size 

 of the ischium. 



Chelipeds (measured round their curve) not twice tlie leno-fh of 

 the carapace : no spine on any of their segments : fingers not so lon^ as 

 the palm. ° 



Legs slightly longer than the chelipeds, their meropodites not afc 

 all broadened but all having a " tympanum " : except in the case of the 

 last pair of legs— in which the dactjlus is remarkably long— the dactyli 

 are rather shorter than the propodites. 



No tympana on the sternum. 



In the Indian Museum are 4 specimens from Aden and the 

 Baluchistan coast. The carapace of the largest is 53 millim. lon^ and 



7"3 millim. broad. 



59. Dotilla intermedia, de Man. 



Dotilla intermedia, de Man, Journ. Linn. Soc, Zool., XXII. 1887-88 n 111 

 pi. ix. figs. 4-6 (1888,'. '' 



Carapace sculptured in much the same way as in D. affinis, only 

 the grooves are not .so deep and distinct, and there is an "additional 

 groove running parallel with the posterior margin. 



707 



