1922.] S. Kemp : Notes on Crustacea Decaboda. 251 



mal portion. It is extremely slender, the basal breadth being only 

 about half that of the distal end of the propodus. 



The apex of the telson (text-fig. Sid) is generally armed with 

 six spines. The two forming the median pair are more slender 

 than the intermediates ; the outermost are very short and incon- 

 spicuous and are occasionally missing. The dorsal spines are very 

 small and are sometimes absent. When present the anterior pair 

 is placed behind the middle of the telson; with the posterior pair 

 midway between the first pair and the apex. 



An exceptionally large female is about 39 mm. in length ; the 

 majority of the specimens examined do not exceed 26 mm. 



Living specimens vary in colour from pale straw to bright 

 orange yellow. In females the entire body and legs are covered 

 v\ith minute white dots and the eggs are pale straw, yellow, orange 

 or brown. Males are semitransparent and lack the white dots 

 found in the female. 



Dr. W. T. Caiman has been kind enough to compare certain 

 specimens which I sent him with the holotype of Miers ' Harpilius 

 inermis. He writes that the type " agrees exactly with your Indian 

 specimens in the form of the chela of the first leg and in the dorsal 

 spinules of the telson (these are very small, near the decurved 

 lateral edge, and easy to overlook), as well as in all other characters 

 that I can see. I think there can be no doubt that your specimens 

 belong to Miers' species." 



Tattersall is doubtless right in his suggestion that Ortmann's 

 Pontonia pinnae 1 is synon5unous with this species. The only point 

 of difference concerns the proportionate length of the palm and 

 fingers of the second peraeopod as shown in the figure. On this no 

 reliance can be placed, as Ortmann's figures are usually inaccurate. 

 I have examined specimens belonging to the Paris Museum which 

 were obtained at the same locality in the Persian Gulf as those 

 which Nobili recorded as Pontonia pinnae and find that they are 

 typical A. inermis. 



( 415/1- Port Blair, Andamans. S. Kemp, Feb., Thirty-four. 



March, 1921. 

 C -(41 1. Andamans. A. R. S. Anderson. Nine. 



(' 442 1. Pavvay I.. Mergui Archi- 'Investigator,' Feb., Two. 



pelago. 1914 



C 416 1. Chevai Paar. Ceylon, 6 T. Southwell, Jan.. Four. 



fins. F"eb., 191 1. 



C 458. 1. Pamban, G of Manaar. S. Kemp, Feb., Five 



•9'3- 



I have also seen specimens belonging to the Paris Museum 

 from the Pearl banks S.W. of Arzana I. in the Persian Gulf, 

 obtained in Pinna (Bonnier and Perez coll.) and from Vanikoro, 

 in the Santa Cruz group, Polynesia. 



The specimens from Port Blair were all obtained in the mantle- 

 cavity of species of Pinna, a mollusc which occurs in abundance 

 at low water at Brigade Creek and on the shore south of Viper I. 



1 The specific name used byOrtmann was preoccupied by Lockington in 1879 

 (see Addendum, p. 287). 



