458 



Records of the Indian Museum. [Vol. XXIV, 



Kilakarai, Gulf of Manaar, from weeds, 0-2 fathoms, Feb- 

 ruary, 1913. Two males and two females. 



'Investigator' St. 556:— 12 40' N., 98 26' 30" E., six 

 specimens. 



The largest specimen of either sex measured 5 mm. 



Distribution. — Hansen (1910 and 1912) has given a synopsis 

 of the known distribution of this species, which is known from the 

 tropical Atlantic, West Indies, Gulf of Siam, East Indian Archipe- 

 lago and the Hawaiian Islands. The only record subsequent to 

 Hansen's paper is that of a single male from the Caribbean Sea by 

 Colosi (1918 and 1920). Gough's record from the English Channel 

 (Publ. de Circonstance , No. 33, 1906, p. 105) is interesting but re- 

 quires confirmation. 



Anchialina grossa Hansen 

 Text-fig. 6. 



Anchialina grossa, Hansen, 1910, p. 54. pi. vii, figs. J,a-n, pi. viii, figs. 



la-d. 

 Anchialina grossa, Hansen, 1912, p. 196. 



,, frontalis, Zimmer, 1915 (3), p. 159, text-figs. 1-6. 



Locality.— Port Blair, Andaman Islands. 

 St. 3. Three specimens. 

 St. 8 Twenty-six specimens. 

 St. 19. Two specimens. 

 St. 21. Three specimens. 

 St. 32. Four males, five females. 



Altogether eighteen males and twenty-five females ; the larg- 

 est male 9 mm., largest female 6-5 mm. 



Remarks. — The specimens agree 

 closely with Hansen's description and 

 figures. A. frontalis, as described by 

 Zimmer, differs from A. grossa (r) in 

 the telson which is only two and a 

 half times as long as broad whereas 

 in A. grossa it is three times as long 

 as broad; (2) in the antennal scale, 

 which is twice as long as broad as 

 against two and a third in A . grossa ; 

 and (3) in the proportions of the an- 

 tennal peduncle. These differences 

 are very small and Zimmer was led 

 to institute his species mainly on the 

 structure of the third pleopod of the 

 male. I give herewith a figure of the 

 distal end of the outer branch of the 

 third pleopod of an immature male 

 of A . grossa measuring 8 mm. It dif- 

 fers remarkably from the fully grown 



Text-fig. 6. — Anchialina 

 grossa, Hansen. 



Distal end of the exopod of 

 the third pleopod of a young 

 male, X 200. 



