406 CEYLON PEARL OYSTER REPORT. 



Chlorodopsis pilumuoides (White, 1847) A. 3, p. 167. 



Localities : Coral reefs, Gulf of Manaar, six specimens ; Navakaddu Paar, four 

 specimens ; Jokkenpiddi Paar, two specimens ; Muttuvaratu Paar, six specimens. 



Description : The above include six adult males, one young male, three ovigerous 

 females, six adult non-ovigerous females, and two young females. C.l.ovig. ? = 9"5. 



Pilodius pugil, Dana, 1852 ('U.S. Expl. Exp., 'Crust., I., 1852, p. 219, pi. xii., fig. 8.) 



Locality : Gulf of Manaar, one specimen. 

 Description: An adult male. C.l. = 10*0. 



Cymo andreossyi (Aubouin), 1826 A. 3, p. 173. 



Locality : Gulf of Manaar, one specimen. 

 Description : Adult male, C.l. = 6'50. 



Calmania, n. gen. 



Carapace subcircular, its length and breadth about equal ; it is convex antero- 

 posterior^, less so from side to side ; the only region distinctly indicated is the cardiac, 

 which is delimited anteriorly and antero-laterally by an obvious groove. The antero- 

 lateral border is indistinctly four-lobed. 



Fronto-orbital breadth about two-thirds the greatest carapace breadth. Frontal 

 breadth about one-third the greatest carapace breadth. The front is rounded 

 anteriorly, continuing the general antero-lateral curve of the carapace; it is very 

 distinctly bilobed ; the lobe of either side is not separated by notch or groove from the 

 orbital border. One of the two supra-orbital grooves is present, the other indicated 

 merely. Eyes on short thick stalks. 



The fold of the antennules is longitudinally oblique, making an angle of a little less 

 than 45 with a perpendicular line. 



The basal antennal segment falls short of the orbital hiatus, into which its outer 

 angle is not produced. The antennal flagellum slender and naked ; it is about ^ C.l. 



No ridges define efferent branchial channel in anterior portion of buccal cavern. 



The merus of the external maxillipeds is broader than long. The ischium is slightly 

 longer than broad. The oiiter angle of the merus is rounded. 



Chelipeds equal (a non-ovigerous, but quite probably mature, female only known), 

 not long, but very massive, the fingers remarkably large, gaping proximally, their 

 tips pointed ; the upper border of the hand bears two prominences the distal of the 

 two is particularly enlarged. The walking legs are approximately the same length as 

 the cheliped ; they are fringed with silky hair. 



It is a little difficult to find relatives for the new genus. I place it among the 

 Xanthidaj, as having the anterior epistomial margin of the buccal cavity well defined 

 and not overlapped by the external maxillipeds, and the antennal flagellum slender ; 

 it differs, however, from the usual Xanthid form in the greater length of its antennal 



