IQIS-] Fauna of tJie Chilka Lake : Crustacea Decapoda. 251 



Clibanarius olivaceus, Henderson. 



1915. Clibanarius olivaceus, Henderson, Rec. Ind. Mus., XI, p. 26. 



This species, described by Dr. Henderson from material obtained in the Chilka 

 Lake and readily distinguished from the two preceding forms by the absence of the 

 conspicuous stripes on the second and third legs, is represented in our collection by 

 seven specimens. 



They were all obtained at the south end of the lake: on the rocks at the base of 

 Ganta Sila in Febuary 1914, in water of specific gravity loio, and in vSeptember of 

 the same year, in water of specific gravity 1-0065 on the landing stage at Barkuda 

 I. At the former locality they were found in company with C. padavensis, at the 

 latter with C. longitarsis, in both cases inhabiting shells of Tliais carinifcya. 



Henderson also records specimens from the Adyar River and, in January 1915, 

 Dr. Annandale obtained a single individual in the Ennur backwater, both localities 

 being situated near Madras. 



Genus DIOGENES, Dana. 

 Diogenes avarus, Heller. 



1915. Diogenes avarus, Henderson, Rec. Ind. Mus., XI, p. 28. 



This species is very abundant in the outer channel of the Chilka Lake and in 

 the salt-water season penetrates to Nalbano. It is not a permanent inhabitant of the 

 main area. 



Specimens were found in shells of Potamides and Nassa and were particularly 

 abundant in the outer channel in September, living in water that was quite fresh : 

 every time the Q-net was hauled over the clean sandy ground opposite Manikpatna 

 hundreds of examples were caught. Ovigerous females were found only in March, in 

 water as salt as that of the Bay of Bengal in the vicinity of the lake-mouth. The 

 hydroid Clavactinia gaUensis was onl}^ found on shells occupied by this species. 



Nobili ' considers D. avarus a synonym of D. pugilator (Roux) and D.varians 

 (Costa), the former name having priority. The species, as recognised by Alcock, 

 has a distribution reaching from E. xAfrica to the Torres Straits and, if Nobili's 

 synonymy be correct, has a much wider range, extending to the Mediterranean. 



Family COENOBITIDAE. 



Genus COENOBITA, Latreille. 



With one exception all the specimens of this genus in our collection are very 

 small and it is improbable that either of the species we obtained ever breeds in the 

 lake. Examples of both forms were found in shells of Natica, a gastropod that does 

 not occur in a living condition in any part of the lake-system. We regard the species 

 as casual visitors rather than as permanent inhabitants. 



' Nobili, Ann. Set. nat., Zool. (9), IV, p. iig (1906) 



