292 CEYLON PEARL OYSTEE REPORT. 



Jassa, Leach, 1813 (= Podocerus, Auct.). 

 Jassa falcata (Montagu) (?). Plate VIL, fig. 47. 



Muttuvaratu Paar, L9th November, 1902. One female without ova; length 

 4 millims. 



In the absence of a male it is impossible to be sure of the species, but in its 

 principal features this agrees with the above. Tlie limbs and antennae are more 

 robust; the flagellum of the upper antenna is 6-jointed, about as long and half as 

 wide as the last joint of the peduncle, the 1st joint as long as the next 3 ; appendage 

 1 -jointed, about one-third of the 1st joint of the flagellum. The terminal joint of the 

 palp of the maxillipeds is oblong, not pointed. The 2nd gnathopods are very robust, 

 but of much the same form as in ./. falcata. The 1st joint is about half as long as 

 the hand ; the separation of the 2nd and 3rd joints is not very distinct, and the 

 wrist appears to be entirely coalesced with the band. The dactylus is apparently 

 encased in a sort of sheath to within a short distance of the point, tbe lower margin 

 being studded with minute equidistant denticles. 



Erichthonius, Milne Edwards, 1830. 

 Erichthonius abditus (Templeton). 

 Abundant from a basket hung to a buoy in Galle Harbour, 9th May, 1902 ; also 

 from other localities along the coast. 

 Length of female with ova, 7 millims. 



Ericbtlionius macrodactylus (Dana). -Plate VIL, figs. 48. 



Pyctilus macrodactylus, Dana, 'U.S. Exploring Exp.,' p. 974, plate 67. 



Station LIIL, north part of Gulf of Manaar ; a ffw specimens. 



Head as long as the first 2 segments, of which the 1st is very short, the remainder 

 subequal. Ocular lobe moderately produced. Eve medium sized, dark, roundish-oval. 



Upper antenna' reaching the middle of the flagellum of the lower; the 1st joint 

 little more than half the length of the 2nd, which is rather longer than the 3rd ; 

 flagellum 13-jointed, subequal to the last 2 joints of the peduncle. 



Lower antenna? : peduncle longer than that of the upper, the 2nd joint shorter 

 than the 3rd, a red blotch upon both; flagellum rather longer than these two 

 together. 



Month organs normal except the palp of the mandible, which, both in this species 

 and in E. abditus, differs from the European form of the latter in having the 3rd 

 joint rather narrower than the 2nd and less expanded towards the tip (fig. 48. m.). 



Maxillipeds normal. 



First gnathopods as in E. abditus. 



Second gnathopods as in E. abditus in tbe female. In the male it is very near to 

 E. difformis, M. Edw., but the thumb-like process of the wrist has the outer margin 



