38 CEYLON PEARL OYSTER REPORT. 



The second guathopods are less robust, the spines of the front margin more 

 developed, those of the hind margin more numerous, but for the most part not so 

 strong, the fifth joint not differing greatly in size and character from the fourth, the 

 finger not quite so long as the sixth joint, and its inner nail showing no serration. 



The fifth perseopod is the longest of the limbs, the process of the third joint by 

 successive reduction in prominence here almost disappearing, the fourth, fifth, and 

 sixth joints attaining their greatest elongation, and the finger being decidedly shorter 

 than the preceding joint. 



The first pleopods exhibit an interesting feature of the inner branch in that its 

 inner margin, instead of joining the outer either by a continuous straight line or a 

 convex curve, here makes a slightly concave sweep from the point where the fringe 

 of long, feathered seta? begins. The second pleopods, as already described and figured 

 by Mr. Whitelegge, are remarkable for the great length and corrugated appearance 

 of the male stilet. This in our specimen, as in that described by Mr. Whitelegge, 

 was stiffened into a strongly bent position. The three following pairs have the 

 covering branch sutured and lying very close to the branchial plate. In the fifth 

 pair the short, but broad, portion beyond the suture is bilobed, and from the junction 

 of the lobes rises a forward-pointing lappet, this, with the border of the inner lobe, 

 and two tubercles just in advance of the suture, being also closely beset with little 

 teeth or prickles in regular arrangement. 



The uropods have the short stout peduncle produced on the inner side to a short 

 thick process representing the inner ramus, of which the appearance varies consider- 

 ably with the point of view. The stout, blunt outer ramus has a tooth on the outer 

 margin at some distance from the apex, often obscure, and, according to Miers, 

 occasionally obsolete. 



Length, 11 millims. to 13 millims. From the tendency of the specimens to fold up, 

 the exact length is not very easily measured. 



Localities : South of Manaar ; Coral reef, Gulf of Manaar ; Pearl banks, Palk Bay. 

 One specimen was obtained at each station. 



Cilicsea latreillii, Leach, juv. Plate III. (B). 



This small specimen is remarkable for its coat. This may be described as thickly 

 beset with short, stiff, irregularly blunt setse covering all the dorsal surface, 

 except such parts as are adapted for sliding under neighbouring parts. In the 

 ' Zoology of H.M.S. "Alert,"' pp. 308-310, 1884, Mr. E. J. Miers makes Splwroma 

 pubescens, Milne-Edwards, 1840, doubtfully, a synonym of Ciliccea latreillii, and 

 Haswell's Cymodocea pubescens, 1881, with conviction, another synonym. His 

 remarks on the variations of this species according to age, sex, and individuality, 

 should be carefully studied by anyone interested in the subject. Haswell gives the 

 length of his longest specimen of Cymodocea pubescens as 1 inch. That the setose 

 covering should be worn down in large specimens might be easily explained, but it is 



