392 



CEYLON PEARL OYSTER REPORT. 



Cryptopodia pan, n. sp. Plate I., fig. 6, and text-fig. 4. 



Localities : Coral reefs, Gulf of Manaar, one specimen (adult ? = a) ; west ot 

 Periya Paar, 17 to 24 fathoms, two specimens (young ? = 6 ; young 3 = c). 



Description of female (a) : C.I. (rostrum included) = 22 '5. Carapace broadly 

 triangular ; antero-lateral margin slightly sinuous, smooth in its anterior third and 

 lacinated in its posterior two-thirds ; the posterior and postero-lateral margins form a 

 single strong curve, the edge of which shows faint traces of crenulation ; the surface of 

 the carapace is fairly smooth to the naked eye, but some obsolescent granules crown the 

 prominences, and there are a few also scattered on the posterior slope ; there are some 



Fig. 4. Cryptopodia pan, n. sp. 



pits, obvious to the naked eye, on the cardiac prominence and on the prominence on 

 either side of it ; the whole surface (as also that of the chelipeds) is dull, which is seen 

 under lens to be due to a fine pitting which covers it ; the triangular depression is 

 shallow ; the oblique branchial ridge of either side is much swollen and rounded ; the 

 rostrum is prominent, obtusely pointed, rather longer than broad, and has the anterior 

 part of the edge faintly crenulate. The carapace is produced beyond the abdomen 

 posteriorly for a distance equal to 0'08 the carapace length. C.b. -s-C.l. = 1'43. 



The third pair of maxillipeds form together a striking bulge. This is due in part to 

 curvature of the appendage, but the most important factor is an actual thickening of 

 the substance of the ischium. The exposed surface of the ischium is glazed, its outer 

 two-thirds particularly are thickened, its inner one-third is ornamented with a double 

 row of granules. The merus is granular on its proximal portion ; distally it is smooth 

 beneath a pubescence. The exopodite is, for the most part, concealed in ventral view 

 by the ischial bulge. 



The chelipeds are much as in Cryptopodia fornicata (see A.I, p. 282), but the 

 surface is dull, not glazed ; the armature is not so sharp ; the outer border of the 

 wrist has no tooth, but its blunt outer angle is well developed, so that its outer border 

 is made up of two borders of approximately equal length set at right angles to each 

 other. The meropodites of all the walking legs have their upper border, and those of 



