3Q6 Records of the Indian Museum. [Vol. XII, 



exactly with these tints, were obtained and a few specimens of a 

 bright red tone were also caught on occasions in which much red 

 alga was Vjrought up in the net. 



''"VJ"" Port Blair, Andamans. S. Kemp. Twenty-four. 



The type specimens bear the numbers 9255-6/10 in the Indian 

 Museum register. 



Genus Latreutes, Stimpson. 



Latreutes pygmaeus, Nobili. 



1914. Latreutes pygmaeus, Kemp, Rt'c Iini. Miis.. X, ]). gy, pi. ii, fi^s. 

 7, 8 ; pi. iii, figs. 1-7. 



The species was very common in the vicinity of Ross I., 

 living among weeds. Most of the females were ovigerous. 



s.^L&. Port Blair, Andamans. S. Kemp. Man\-. 



Latreutes planirostris (de Haan). 



1907. Latreutes planirostris, dc Man. Trans. Liuu. Soc, ZooL. (2). 



IX, p. 421. 

 1914. Latreutes planirostris, Balss, Abliafidl. math.-plivs. Klasse K. 



Bayer. Akad. Wiss., Suppl, Bd. II, abh. 10, p. 46. 



This species is represented in the Museum collection by two 

 female specimens, in both of which, as in those examined by Miss 

 Rathbun,' the median spine in the posterior third of the carapace, 

 figured by de Haan, is obsolete. 



Miss Rathbun cites L. mucronaUis as a synonym of L. plani- 

 rostris, but this view is not held by Balss. L. planirostris is a 

 larger species, with even more perfectly orbicular rostrum than in 

 any examples of L. mucronatus that I have seen; the carapace, 

 moreover, is carinate in the mid-dorsal line almost up to the pos- 

 terior margin. 



-f^ Sagami Bay, Japan. Munich Mus. One, 25 mm. 



"fo" Misaki, Japan. Kuma Aoki. One, 28 mm. 



Latreutes mucronatus (Stimpson). 



1914. Latreutes viucrouatus, Kemp, Rec. Ind. Mus., X, p. lui, pi. iii, 



figs. 8-15 ; pi. iv, figs. I, 2. 

 1914. Latreutes mucronatus. Balss, Abliandl. tnatli.-pliys. Klasse A. 



Bayer. Akad. Wiss., Suppl. Bd. II, abh. lu, p. 47, fig. 27. 



The additional specimens agree with those recorded from Kila- 

 karai and Pamban in vS. India, but are rather smaller ; the largest 

 is only I0"5 mm. long and one of the five ovigerous females is less 

 than 8 mm. in length. The remarkable sexual differences noted 

 in the case of the S. Indian specimens are clearly shown in the 

 Andaman series, the females have the carapace more strongly 

 arched and the rostrum more orbicular than in the males. Out of 

 a total of thirty individuals only five, all males, possess more than 

 a single tooth on the carapace behind the orbit ; in three specimens 



Rathbun, Proc. U.S. Nat. Mus., XX\'I, p. 46 (i9;)2). 



