TO INDIAN CAECINOLOGY. 449 



Considerable variation is seen in the length of the telson, and in some specimens the 

 marginal spiuules are well developed, especially the subapical pair, while in others the 

 whole series is scarcely marked, or even altogether absent. 



Distribution. Indian Seas, Malay Archipelago. 



273. Pesleus Dobsoni, Miers. 



P. dobsoni, Miers, Proc. Zool. Soc. p. 302, pi. xvii. tig. 2 (1878). 



Madras ; a female specimen, probably from fresh water (J. R. H.). 



The surface of the body is slightly pubescent. The rostrum is styliform and slightly 



8 

 upturned distally, with the dental formula ^, the first tooth at some distance from the 



second, and the fourth above the orbital margin. The antennular flagella are about 

 equal in length to the peduncle. The first three pairs of legs are unispinose at the base. 

 The fifth pair of legs are rudimentary in the female, being represented merely by a basal 

 protuberance on each side (while in males they are normal, according to Miers). The 

 genital bursa or thelycum * in the female is trefoil-shaped, with a central depression. 

 The total length of the Madras specimen is 103 mm. 

 Distribution. Mangalore, Western India (Miers). 



274. Pen^tjs velutintts, Dana. 



P. velutinus (Dana), Bate, 'Challenger' Macrura, p. 253, pi. xxxiii. tig. 1 (1888). 



Gulf of Martaban, a series (Oates). 



The rostrum is straight, or rises slightly from the base to the apex, and scarcely 

 reaches the end of the antennular peduncles, while posteriorly it does not extend behind 



the middle of the carapace ; the dental formula is -g-, the lower margin with long cilia, 



and the first upper tooth separated by a wide interval from the second. The antennular 

 flagella are very short, being scarcely as long as the two terminal joints of the peduncle. 

 The entire surface of the body is pubescent. The eyes are of larger size than usual. 

 The last four abdominal segments are carinated, and the distal half of the telson is 

 armed with well-developed lateral spines. The petasma in the male is asymmetrical. 

 The largest Martaban example is 65 mm. long. 



Distribution. Red Sea (Miers) ; Mauritius (Richters) ; Singapore ( Walker) ; Malay 

 Archipelago (Date) ; N. Australia (Date) ; W. Australia (Miers) ; Loo-choo Is. (Stimp- 

 son) ; Japan (Stimpson, Date, Ortmann); Sandwich Is. (Dana). It occurs also in the 

 Atlantic region, on the coast of Senegambia (Miers), and in the West Indies is repre- 

 sented by the closely allied P. pubescens, Stm., which Miers regarded as scarcely 

 distinct. 



* Although good specific characters are probably to be obtained from this organ, and from the petasma in the 

 male, 1 have not attempted to describe them in the other species, owing to the difficulty of doing so without 

 reference to figures. 



