270 ZOOLOGY OF THE FAR EAST. 



more slender, with a proportionately longer dactylus, that of the third pair being 

 three quarters the length of the propodus. 



The specimens collected b}^ Dr. Annandale were obtained in February, 1914, in 

 brackish water at the mouth of the Prai River opposite Penang ; the species was 

 extremely abundant in very shallow water at the edge of mud flats and, when alive, 

 was whitish in colour without definite markings. 



Other examples in the Indian Museum are from Fisher Bay, Port Owen, Tavoy 

 I., Burma, obtained in November, 1911, by the- R.I. M.S. 'Investigator' and from 

 Bandra, near Bombay, collected in February igii by Mr. J. W. Gaunter, from Ennur 

 backwater near Madras, collected by myself in May 1918 in water of specific gravity 

 I •02625. There are ovigerous specimens from all the localities. 



Leandev semmelinki has been recorded from the roads of Makassar in Celebes 

 (de Man), from Luzon in the Philippines (Ortmann) and from Singapore (Nobili). 



Leander potamiscus, Kemp. 



1917. Leander potamiscus, Kemp, Rec. Ind. Mus., XIII, p. 225, text-fig. 7. 



This species, which has been described from material collected by Dr. Annandale, 

 differs from all known members of the genus with the exception of L. fluminicola, 

 Kemp, in the complete absence of the branchiostegal spine of the carapace. 



The type specimens were collected by Dr. Annandale in the Patani River, below 

 the town of Patani in the Siamese Malay States and the species was also found at 

 Telok Tikus on Penang I. Other specimens in the collection of the Zockgical Survey 

 of India are from Middle I., in the Andaman group and from the Sargucm and Tuari 

 Rivers in Portuguese India. All the specimens were found in fresh water, but 

 in places subject to tidal influence. 



Leander paucidens (de Haan). 



1907. Leander paucidens, de Man, Trans. Linn. Soc. Zool. (2), IX, p. 409. 

 1914. Leander paucidens, Balss, AbhandL math.-phys. Klasse K. Bayer. Ak.zd. Wiss., Suppl. 

 Bd. II, Abh. 10, p. 58. 



Of this Species, which is by far the commonest freshwater prawn in Japan, large 

 numbers of specimens were obtained by Dr. Annandale. There are long series from 

 Lake Biwa and from Ogura pond near Kyoto and other less numerous examples from 

 the Yodo R., i mile above Osaka, from Kasumi-ga-ura on the Pacific coast and from 

 Sapporo in Hokkaido : the specimens from the last locality were presented by the Otsu 

 laboratory. All were collected in fresh water and a number of the females bear 

 eggs. 



The species was found in all parts of Lake Biwa, but was most abundant near the 

 shore. Individuals were obtained in nets hauled in deepest part of the lake, at a 

 depth of 320 ft., and as the species appears to live exclusively on the bottom there is 

 every probability that they actually came from the depth indicated. Specimens from 

 over 200 ft. are all small, none exceeding 35 mm. in length ; nearer the shore larger 

 examples, up to 48 mm. in length, were obtained. The largest specimens in the collec- 



