250 Memoirs of the Indian Museum. [Vol. V, 



Clibanarius padavensis, de Man. 



1915. Clibanarius padavensis , Henderson, Rec. Ind. Mus., XI, p. 25. 



This species, which has frequently been recorded from brackish water, is abun- 

 dant at the south end of the lake, where it may be found crawling on the rocks at the 

 base of Ganta Sila and on Breakfast I. It is also common in the outer channel, 

 from Satpara at least as far as Manikpatna. 



As is the case with all the Pagurids found in the lake, the species seems unable to 

 exist on the soft mud of which the bottom is composed over the greater part of the 

 main area. At the southern end it lives only on rocky or stony ground and in the 

 outer channel on a foreshore of muddy sand or sand. The species appears to be 

 wholly absent from Barkul Point and Patsahanipur. The shores in these localities 

 seem as suitable as at the southern end of the lake, but gastropod shells of any size 

 do not occur. 



In the main area very young specimens are to be found in shells of Pot amides 

 fluviatilis, while the larger individuals inhabit Thais carinifera. In the outer chan- 

 nel adults make use of Telescopium fuscum, while young examples are found in Pota- 

 mides, Natica and Nassa labecula. 



C. padavensis is to be found in the lake at all seasons of the year and occurs 

 in water that is fresh, brackish, or as salt as that of the open sea in the vicinity. 

 Ovigerous females were obtained in March, both in the main area and in the outer 

 channel, in water of specific gravity varying from 1010 to 1-0265. Young specimens 

 belonging to this genus are extremely scarce in the main area. 



The species has a wide Indo-pacific distribution, extending from the western 

 coasts of India to Australia and New Caledonia. 



Clibanarius longitarsis (de Haan). 



1887. Clibanarius longitarsis, de Man, Arch. f. Naturgesch., LUI, i, p. 441. 

 1915. Clibanarius longitarsis, Henderson, Rec. Ind. Mus., XI, p. 25. 



Henderson notes that this species, which is not included in Alcock's Catalogue 

 of the hermit-crabs in the Indian Museum, is the commonest brackish-water Pagurid 

 on the Coromandel coast. It is apparently scarce in the Chilka Lake and is almost 

 certainly absent from the Gangetic delta. 



The two specimens in our collection were found in company with C. olivaceus, 

 crawling on submerged stones at the sides of the landing stage on Barkuda I. They 

 were obtained in September 1914, when the water was very slightly brackish (sp. gr. 

 1-0065) living in shells of Thais carinifera. The species probably occurs at the southern 

 end of the lake throughout the year in water of specific gravity varying from 1-006 to 

 1-015. 



The specimens are both very small ; the length of the carapace in the larger is 

 only 11 mm., whereas in an individual recently obtained by Dr. Annandale in the 

 Ennur backwater near Madras it is fully 30 mm. 



C. longitarsis is known to have a distribution extending from E. Africa to Japan. 



