178 Records of the Indian Museum. [Vol. V, 



is evidently very closely allied. The most distinctive character 

 which it possesses is the spoon-shaped portion which is directed 

 forwards from the middle of the distal margin of each lobe. 



Gennadas scutatus, Bouvier. 

 (Plate xiii, figs. 9, 10.) 



Gennadas scutatus, Bouvier, Res. Camp. Sci. Monaco, xxxiii, 

 1908, p. 42, pi. viii. 



Gennadas scutatus, Kemp, Proc. Zool. Soc. , 1909, p. 727, pi. 

 Ixxv, fig. 2. 



St. 108.— Off C. Comorin, 7° 4' N., 76° 34' 15" E., 1,043 fath- 

 oms. One male, about 29 mm. 



St. 109.— Off C. Comorin, y° 1' N., 78° 21' E., 738 fathoms. 

 One male, broken. 



With the exception of the petasma, these specimens agree 

 closely with the example obtained by the ' Challenger ' in the N. 

 Pacific (Kemp, loc. cit.). They differ from Bouvier's description 

 and figures in the following particulars : — 



The ultimate joint of the mandibular palp is fulh' as long as the 

 width of the basal joint. In the second maxilla (tig. 9) the anterior 

 lobe of the internal lacinia, though not wider at the apex than at 

 the base, is widety separated from the posterior lobe and is nar- 

 rower than the adjacent lobe of the external lacinia. The third 

 joint of the endopod of the second maxillipede is a trifle wider than 

 in Bouvier's figure. The chelae of the third pair of peraeopods 

 are longer ; in one specimen they are three-fifths the length of the 

 carpus, while in the other they are a trifle shorter, but still con- 

 siderably more than half the length of the carpus. 



The petasmata of the two specimens are as nearly as possible 

 identical and, considering the great uniformit}^ of outline which 

 these structures usually present, show a considerable amount of 

 divergence from the type. The principal points of difference, as 

 will be seen by comparing fig. 10 with Bouvier's text-figure,' con- 

 cern the development of the large median distal lobe. This is 

 truncate and furnished with a small pointed process on the out- 

 ward side in the type, while in the present specimens it is sharply 

 pointed and the .small process is entirely absent. 



Gennadas scutatus is now known from the Atlantic (Bouvier), 

 from the Pacific ('Challenger') and from the two localities men- 

 tioned above. When more extensive collections have been made, 

 it will be possible to determine whether, in these widely distant 

 localities, there really exist distinct races of this species, differ- 

 ing from one another in the form of the petasma, or whether 

 there is in this respect merely an exceptionally large range of 

 variation. 



I Bouvier, BttlL Mas. OcSanog, Monaco, No. 80, 1906, p. 11, fig. 13. 



