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CEYLON PEARL OYSTER REPORT. 



are shorter than the palm and the gape may be very pronounced, or scarcely 

 noticeable. 



(6) A few long iridescent hairs occur on the carapace and abdomen. 



It might be thought that a variety could be established on these characters, but I 

 prefer to regard them as individual variations. This species is new to the Indian 

 Ocean, being only previously known from Japan. 



Munida alcocki, n. sp. Text-fig. 2. 



The rostrum is about one-third the length of the carapace, and has about three 

 regular and minute notches towards the apex. It is slightly sigmoid. The supra- 

 orbital spines are as long as the eye and half the length of the rostrum. A few setae 



Fig. 2. Munida alcocki, n. sp., x 4. 



overlap the cornea. The striae on the surface of the carapace are numerous and 

 pubescent. A few long iridescent hairs arise from the ridges of the thorax and 

 abdomen. There is a transverse row of ten spines at the base of the rostrum. The 

 median pair are situated a little in front of the rest, the second and fourth pairs being 

 a little longer than the third and fifth. Separated from these by the first ciliated line 

 is another pair of spines, situated laterally. Three additional pairs of lateral spines 

 are situated a little behind the cervical groove, making eighteen spines in all, The 

 lateral margin of the carapace is armed with seven spines. 



