1914.] S. Kemp : Notes on Crustacea Decapoda. loi 



;^« Kilakarai Ramnad l),st., S. India. | g_ ^^ ^^ „^,^^_ 



H Pamban, Ramnad Dist., S. India. ) ' •' ^ 



Latreutes pygmaeus was common at both of the above 

 locahties living among weeds in a few feet of water ; in Hfe the 

 species bore a close general resemblance to the British Hippolyte 

 pyideauxiana. The collection, made in the month of February, 

 includes a large proportion of ovigerous females. 



The species has been recorded by Nobili from the S. E. 

 coast of Arabia and the Red Sea. 



Latreutes mucronatus (Stimpson ). 

 Plate III, figs. 8-15 ; plate IV, figs i, 2. 



18O1). Rhyiiclwcvcliis iiiiuToiuifiis, Stimpson, Proc. Acad. Sci. Phila- 

 delphia, p. 28. 



1902. Latreutes viitcrouatiis, Doflein, Abhandl. bayerisch. Akad. Wiss.. 

 XXI, p. 638, pi. V, fig. 6. 



1904. Latreutes gravieri, Nobili, Bull. Mus. Hist, nat., p. 231. 



1906. Latreutes gravieri, Nobili, Bull. sci. France et Belg., XL, p. ,^9, 

 pi. iii, figs. 4-44. 



1906. Latreutes gravieri, Nobili, Ann. Sci. nat. Zool. (9), IV, p. 41. 



igo6. Latreutes mucronatus var. niultidens. Nobili, ibuL p. 41, pi. ii, 

 %■ ,v 



Examination of a series of specimens from S. India suggests 

 that L. gravieri must be regarded as a synonym of L. mucronatus 

 and that there is no foundation for the retention of the varietal 

 name niultidens- 



The series comprises twenty-nine examples, and of these 

 eighteen were immediately separated from the rest on account of 

 their stout and gibbous form and more or less circular rostrum 

 (pi. Ill, figs. 8,9; pi. IV, fig. I). They were at once referred to 

 L. mucronattis and examination of their rostral formulae indicated 

 that the type specimen of L. mucronatus with a formula of f and 

 those referred by Nobili to his var. multidens, with formulae 



ranging from "g \^i\ are only terms in a series exhibiting con- 

 tinuous variation. The formulae which the S. Indian specimens 

 yield are as follows ' : — 



1)15 1)13 i)iz i)ii 1)10 i)ii_i i)g i)7_ 1)12 i]9 

 15 13 13 12 II 9 ^ ^7 7 



1)8 1J8 1)8 1)7 3)jo 3)Q i_)8_ 4j_i3 



7 7 7 7 ^^ <^ 6 4 



The remaining specimens characterized by their more slender 

 form and narrower rostrum (pi. Ill, figs. 10, 11 ; pi. IV, fig. 2) 

 afforded a more difficult problem. Not only did the rostrum 

 exhibit a most remarkable diversity of form, but the proportions 



' The figure on the left, separated by a bracket, represents the number 

 of teeth on the carapace in the media-n line. 



