362 CEYLON PEARL OYSTER REPORT. 



cheliped length. Specimen (h), though female, has well-marked spinule on penultimate 

 abdominal tergum. Measurements taken as in M.fugax. 



Myra darnleyensis, Haswell, 1879 A.2, p. 207. 



Localities : Aripu coral reefs, Gulf of Manaar, four specimens ; pearl banks, three 

 specimens. 



Description : There are in all considerable traces of the " cruciform constellation" 

 of five enlarged granules on centre of dorsum of carapace. This is evidently not 

 confined to females and young males, as it occurs in an adult male from " pearl 

 banks." 



Leucosia obtusifrons, be Haan, 1841 A.2, p. 21G. 



Localities : Aripu coral reefs, Gulf of Manaar, tAvo specimens (a, b) ; off Kaltura, 

 one specimen (c). 



Description : (a) young J. (h) young <J. (<-) adult <$ . 



0.1 12-75 17-25 25-00 



Gb.T-C.1 0-90 0-91 0-92 



Oh.l.-f-O.l 1-10 L20 L45 



In addition to the two pairs of white gastric spots characteristic of the species 

 there is a third pair of quite small but otherwise similar ones, anteriorly. In 

 specimen (a) young male all these spots are faintly ringed and a pair of postero-lateral 

 orange spots is present also. 



Leucosia longifrons, de Haan, 1841 A.2, p. 217. 



Localities : Trincomalee, two specimens (a, b) ; pearl banks, Gulf of Manaar, one 

 specimen (d); Station I., off Negombo, one specimen (c); Aripu Reef, one specimen (e). 



Desertion : (a) young ? . (//) young <$ . (c) young ? . (<l) young ? . () adult ? . 



Gl 17-00 17-50 17-50 1775 26-00 



C.b.-=-C.l. . . 0-85 0-87 0-87 0"87 0"87 



Specimen (c) young female comes under var. pulcherrinia. Specimens (a) young 

 female and (b) young male show some tendency to vary in the direction of the same 

 variety (anterior half of carapace is slightly punctate) ; propodites of walking legs 

 carinate dorsally and tend to be so ventrally also, each of the posterior two of the six 

 spots of gastric shoe is surrounded by red rings. 



On the other hand, var. neocalidonica characters are hinted at in specimens (d) 

 young female and (e ) adult female, where in addition to dorsal and ventral carination 

 of propodites of the walking legs, common to pulcherrima and neocalidonica, the chelae 

 and walking legs have a tendency to the granulation of the latter variety. Thus in 

 (e) adult female the wrist has trace of the three granules, the meropodite of walking- 

 leg 1 has traces of one dorsal and one ventral row, and that of walking leg 2 has traces 

 of one dorsal row of granules. 



