166 CEYLON PEARL OYSTER REPORT. 



A minute granule is set in the centre of each pit, and between the pits are scattered 

 here and there small tubercular elevations. 



The first legs (fig. 32) have the basis narrower than in the last species, and the 

 sj tines on its lower surface more numerous. The dactylus is only half the length of 

 the preceding segment. 



The second legs (fig. 33) have the basis very short, only one-third of the whole 

 length of the limb. The spine on the ischium only reaches to the end ot the 

 succeeding segment. 



The uropods (fig. 34) are nearly twice as long as the terminal somite, the peduncle 

 nearly one-third of the length of the rami. The inner edges of peduncle and endopod 

 clothed with setae, among which are one or two spinules. The outer and inner 

 edges of the exopod each bear a number of setse. 



Locality. The Cheval Paar, in the Gulf of Manaar, depth 7 fathoms. Two 

 specimens. 



Eocuma sarsii (Kossmann) Plate II., figs. 35 to 38. 



Cyclaspis sarsii, Kossmann, 'Zool. Ergeb. einer Reise in die Kiistengebiete des rothen 

 Meeres,' II., ltc Lief., III., Malacostraca (2. Theil; Anomura), pp. 88 to 90, Plate IV., 



fig. 3, 1880. 



A single immature specimen, 4 millims. in length, probably female, which I refer 

 to this species, has the following characters : Carapace hardly depressed, about five- 

 sixteenths of total length, with very stout curved lateral cornua, behind which the 

 lateral margin is marked by a low irregularly serrate ridge. The breadth across the 

 cornua is four-fifths of the length. The cornua reach forward as far as the level of 

 the pseudorostrum, which is broad and squarely truncate, as seen from above. 

 External to the pseudorostrum on each side is an almost rectangular tooth, the 

 anterior edge of which is serrate. This tooth is separated from the lateral cornu by 

 a deep semicircular excavation. The dorsal surface is raised into a median keel 

 anteriorly, where also there is a slight elevation on each side of the cephalic lobe. 

 At its anterior end the median keel bifurcates on the ocular lobe to separate from 

 each other the three not very distinct corneal areas. About the middle of the length 

 of the carapace the median keel dies out and is replaced by a pair of longitudinal 

 ridges some distance apart. The hinder margin of the carapace is elevated in the 

 middle line into a rounded tubercle. The ocular lobe is nearly twice as broad as 

 long, and there is no ocular pigment. The pseudorostral plates meet in front for a 

 distance about equal to the length of the ocular lobe. Seen from the side, the 

 pseudorostrum is obliquely truncated. The surface of the carapace (and, less 

 distinctly, the rest of the exoskeleton) is covered with shallow circular pits, in the 

 centre of each of which is a minute granule. The surface between the pits forms a 

 raised network, which shows more or less distinctly the primary reticular texture of 



