lf> 6 CEYLON PEARL OYSTER REPORT. 



this specimen is a matter of some doubt. A description of the specimen is therefore 

 given. 



The carapace has the rostral projection short and bluntly rounded. It is without 

 any trace of dorsal lobes on its hinder margin, which is slightly emarginate. 



The pleon has the sixth segment about one and a half times as long as the preceding 

 one, which shows no trace of a median posterior dorsal spine. 



The antennuiar peduncle, which is only slightly longer than that of the antenna, 

 has two small spines on the outer margin of the second joint. 



The antennal scale is very short, scarcely reaching beyond the distal end of the 

 basal joint of the antennuiar peduncle. Its outer margin is entire and terminates 

 in a very strong spine. The apex of the scale does not project beyond the tip of the 

 spine. 



The telaon is as long as the last segment of the pleon and cleft at its apex, the cleft, 

 as usual in this sub-family, being serrated. The lateral margins bear six long and 

 stout spines. 



The uropods are both slightly longer than the telson, the inner a very little longer 

 than the outer. The outer uropod has eleven strong spines on the outer margin, 

 while the inner bears five spines on its internal margin. 



Length, 5 millims. 



It is probable that the above specimen belongs to H, erythrcBus. As just described, 

 it differs from H. normani in the antennal scale, which has a stronger terminal spine 

 and the apex not produced beyond the spine, and also in having a much blunter 

 rostral projection. The males further differ from those of H. normani in having 

 the inner branch of the third pleopod in the male quite absent. 



H. erythrceus is only known from the Bed Sea, where both KOSSMANN'S types and 

 the above specimen were obtained. 



III. STOMATOPODA. 



FAMILY: SQUILLULE. 

 Squilla raphidea, FABRICIUS. 



Locality : South-west part of Palk Bay, oft' Adam's Bridge and Rame'swarani 

 Island, 7 to .9 fathoms. One male, 125 millims. 



This specimen differed from large examples of this. species which I examined in the 

 British Museum in having the lateral processes of the fifth thoracic somite obtuse 

 instead of acutely spinous. 



Distribution : S. raphidea has a general Indo-Pacific distribution, though not 

 previously recorded from the coast of Ceylon. 



Squilla nepa, LATREILLE. 



Locality : South-west of Palk Bay, off Adam's Bridge and Bdme'swaram Island, 

 7 to fathoms. One male, 42 millims. 



