iQig.J vS. Kemp : Nu/es on Crustacea Decapoda. 331 



i-^:ji'-^ 7 Bombay and Karachi. A. O. Hume, F. Day and Four, Tvhes. 

 afga j " W. T. Blanford. 



af§'' Orau I., Bomb.ay. H.J. Walton ; April. May, Thirty. eiyht. 



i(.)iS. 



Not known from an}^ other locality. 



Dotilla intermedia, de Man. 



1888. Dotilla infeniiedi/i, de Man, Joiii'ii. LiiDi. Soc. ZooL, XXH, p. [^5. 



pi. ix, figs. 4.-6. 

 1900. Dotilla clepsydrodactyhts. Alcock, Joittni. Asiaf. Soc. Bengal I, XIX, 



p. 367, and Illitstr. Zool. Investigator, Crust., pi. Ixiii, figs. 2, 2a. 

 1915. Dotilla clepsvdrodactylns, Kemp, Mem. Ind. Miis. \' , p. 226. 



Examination of a very fine series of specimens, recently col- 

 lected by Dr. F. H. Gravely at Chandipur inOrissa, has convinced 

 me that D. clepsydrodaciylus is synonymous with D. intermedia. 

 I have seen the types of both forms and find that the configura- 

 tion of the grooves of the carapace is identical. D. intermedia 

 was described by de Man from a number of small specimens ^ in 

 which the characters of the adult male chela were not developed. 



Altogether I have examined 316 specimens of this species, of 

 which 235 (148 males and 87 females) were obtained by Dr. 

 Gravely at Chandipur on the Orissa coast. Among the males 

 from this locality two very distinct dimorphic forms occur, which 

 may be termed ' high " and '' low." 



In the " high " male, which is the type described by Alcock, 

 the first abdominal sternum bears a sharp transverse ridge on 

 either side of the trough formed to receive the terminal segment 

 of the abdomen and well behind its anterior limit. The fingers of 

 the chela each bear a large lobe or tooth near the middle of their 

 prehensile edge. The copulatory appendage is blunt at the tip 

 and furnished with numerous setae. 



In the " low " male the first abdominal sternum bears ante- 

 riorly a pair of large outstanding triangular teeth ; these are in 

 advance of the anterior limit of the abdominal trough and are 

 thus placed considerably further forwards than the ridges in the 

 " high" male. The dactylus of the chela bears a low rounded 

 lobe near the base of its prehensile edge (further back than in the 

 " high" male) and there is no lobe or large tooth on the fixed 

 finger. The copulatory appendage is more slender, strongly sinu- 

 ous, and terminates in a fine point which is turned inwards and 

 does not bear conspicuous setae. 



That these two types of male belong to the same species is, I 

 believe, incontestable. In the form and areolation of the carapace 

 they resemble each other exactly and they were, moreover, all found 

 in the same locality. 



' De Man described the species from 32 specimens, "all males." Of these 

 14 are in the collection of the Zoological Survey of India, labelled •' types " in de 

 Man's handwriting. De Man was mistaken as lo the sex ot his specimens, for 7 

 of those examined are females. 



