I9i7'.l ^' Kemp : Notes on Crustacea Decapoda. 227 



A few of the largest, however, probably adult males, had several 

 longitudinal black lines on each side of the carapace which con- 

 verged forwards slightly. They had also a small black spot on 

 the side of each abdominal somite. The fingers of the second legs 

 were scarlet and the palms of the chelae opaque shining white ; 

 there were also opaque shining white spots on the other segments 

 of the chelae. 



The specimens collected by Dr. Annandale were caught in 

 February 19 16, in the Patani River, below the town of Patani in 

 the Siamese Malay States and at Telok Tikus on Penang Island in 

 a small stream near the sea. A number of other examples ' are in 

 the Indian Museum, obtained by Col. C. G. Rogers in a small creek 

 at the south-eastern corner of Middle I. in the Andamans. The 

 largest of these specimens is 38 mm. in length, the collection, which 

 was made iu April 1911 not comprising any ovigerous females. 

 In all three localities the specimens were found in fresh water, the 

 situation in which they were taken being, however, subject to tidal 

 influence. 



The type specimens, from the Patani River, bear the number 

 9552/10 in the register of the Zoological Survey. 



Palaemon mirabilis, sp. nov. 

 (Plate X.) 



A very remarkable Palaemonid, represented in the Indian Mu- 

 seum by a number of specimens from the Rangoon and Moulmein 

 Rivers and from various localities in the Gangetic delta, apparently 

 belongs to a species hitherto undescribed. In the peculiar form of 

 the rostrum and the extreme slenderness of the legs the species 

 differs widely from typical members of the genus Palaemon and 

 bears a curious and perhaps significant resemblance to Leander 

 styliferus. 



The rostrum is short and does not quite reach the end of the 

 antennular peduncle. On the upper side of the lateral carina it 

 consists of a thin lamella — in height greatly exceeding that of any 

 other species of Palaemon known to me —with a strongly convex 



' Since the above account was written I have obtained about thirty-five addi- 

 tional specimens of L. potamisctis in Portuguese India. A number were found in 

 the Sanguem R. at Sanvordem and one, presented by Capt. F. de Vasconcellos, 

 was taken in the Tuari R. near Cortalim. These records, being from the west 

 coast of India, indicate a considerable extension in the known range of the species. 

 The specimens agree closely with the types, but possess on the whole fewer rostral 

 teeth ; on the upper margin "at the base there are 7 or 8 , rarely 9, and on. the lower 

 margin only 6 or 7. In the single individual from the Tuari R. the basal crest is 

 composed of 6 teeth, while there are 8 on the lower margin. The specimens differ 

 from L. fiiirninicola in all the points noted above. When living thay were semi- 

 transparent, with a few very small chromatophores scattered on the body ; the 

 rostrum in front of the basal crest was deeply pigmented. The colouration thus 

 differs conspicuously from that noted by Dr. Annandale in the case of large Patani 

 R. examples. As in the case of the other records, the specimens from Portuguese 

 India were found in fresh water, but in places subject to tidal influence. .\ number 

 of individuals harbour Bopyrid parasites. 



