548 Memoirs of the Indian Museum. [Voi,. V, 



age was nearly half the length of the last joint of the peduncle. The correspond- 

 ing antenna of the other side was quite normal; it is shown in figure ga. 



Stebbing has united H. nilssonii Rathke with H. prevostii M.-Edw. (1906, p. 565), 

 but Chevreux (1911, p. 234) does not agree and retains H. nilssoni as a separate 

 species though he unites with it H. stebbingii Chevreux, which he had previously 

 described as a separate species. Chevreux says H. prevostii M.-E. is rather the same 

 as H. perieri IyUcas which is the commonest species of the genus in Western Medi- 

 terranean and accordingly he gives H. perieri as a synonym of H. prevostii M.-Edw. 

 Stebbing kept H. perieri as a distinct species. 



[A common bottom species in the main area. It also has the habit of congre- 

 gating in enormous numbers on the upper surface of masses of drifting weed (Pota- 

 mogeton pectinatus) , to which it clings by means of its peraeopods, as a rule lying on 

 one side. In this position it feeds on the minute algae, vorticellid Protozoa and 

 Polyzoa (Membranipora hippopus) with which the weed is usually covered. N.A.] 



Grandidierella megnae (Giles). 

 (Text-fig. 10.) 



Microdeutopus megnae Giles, 1888, p. 243, pi. 7, figs. 1-4. 

 Microdeutopus megnae Stebbing, 1906, p. 592. 

 Grandidierella mahafalensis Coutière, igo4 ; p. 173, with text-figs. 

 Grandidierella bonnieri Stebbing, 1908, p. 119, pi. vi. 



Localities : — 



Off Samal Island, 8-15 ft., 22-ix-i3. Several. 



Off Satpara, 4-5 ft., I7~ix-i3. Several, immature. 



Off Barkul, 3-4 ft., 21-VÜ-13. One, female. 



Off Barkul, at edge of lake, 21-VÜ-13. One male (form 1), one female, 2 



immature. 

 Barkul, i8-iv-o5. Several, male (form 1) and female, many immature. 

 Adyar River, outskirts of Madras. 3-4 ft. One male (form 1) and females. 

 East side of Rambha Bay. Three. 

 6 miles S. S.W. of Kalidai. Male (form 2) and female. 

 3-2 miles S.E. by E.|E. of Patsahanipur. Several. 

 5-7 miles E. by N. of Patsahanipur. Several. 



1 mile E. by N. of Patsahanipur. Several, male (form 2) and female. 

 2-6 miles E. by S.-§ S. of Patsahanipur. Several, male (form 2) and female. 

 4 miles N. E.|E. of Kalidai. Many, mostly immature. 



This species has given rise to much consideration. The first specimen that 

 dissected and examined was easily seen to agree closely with the description given 

 by Giles of Microdeutopus megnae, a species that Stebbing in 1906 retained under the 

 genus Microdeutopus.- This specimen was a male, somewhat immature, and the 

 stage appears to correspond pretty well with the one actually described by Giles. 

 In the first gnathopod the carpus bears on its posterior margin a small tooth which 

 was either absent from Giles' specimen or not observed by him. Giles had com- 





