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, Rés. Camp. Sct. Monaco, xxxiii, 
1908, p. 42, pl. vil. 
Gennadas scutatus, Kemp, Proc. Zool. Soc., 1909, p. 727, pl. 
Iexy: ie 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,,7° 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, Joc. cit.). They differ from Bouvier’s description 
and figures in the following particulars :— 
The ultimate joint of the mandibular palp is fully as long as the 
width of the basal joint. In the second maxilla (fig. 9) the anterior 
lobe of the internal lacinia, though not wider at the apex than at 
the base, is widely separated from the posterior lobe and 1s 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 uniformity 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. 
| Bouvier, Bull. Mus. Océanog, Monaco, No. 80, 1906, p. 11, fig. 13. 
