36 Bernice P. Bishof' Museum — Bulletin 



Gonodactylus chiragra (Fabricius). 



Gonodactylus cliiiagra Kemp. Mem. Indian Museum, vol. 4, p. 155, pi. 9, fig. 

 107, 1913. 



The species is distributed throughout the Indian Ocean and ranges in 

 the Pacific Ocean from Austraha northward to Japan and eastward to 

 Tahiti. A single specimen whicli corresponds in its chief features with 

 the typical form of this species was collected at Palmyra Island by 

 C. Montague Cooke Jr. in 1913. 



The telson is narrow, its dorsal surface marked by five prominent 

 carinae ; median carina without a posterior spine but with well defined 

 anchor-flukes ; submedian carinae elongate, in line with the long carinae 

 supporting the submedian teeth of the posterior border; intermediate car- 

 inae continuous throughout the length of the telson; lateral margins 

 carinate. 



Submedian teeth of the posterior border broad and prominent, ternn- 

 nating in small movable spines ; intermediate teeth represented by rounded 

 points without spines at their tips; lateral notches distinct. The distal 

 extremity of the dactylus of the cheliped is strongly curved. Total length 

 of the specimen, measured from the tip of the rostral spine to the ter- 

 minating spines of the submedian teeth, is 30 millimeters. Figure 3, h. 

 represents the telson of the Palmyra Island specimen. 



Gonodactylus chiragra var. smithii Pocock. 



Gonodactylus smithii Pocock. Ann. M:ig. X;il. lli.-l. (0.). vol. 11. p. 475, pi. 20, 



B, fig. 1, 1893. 

 Gonodactylus chiragra var. smithii, Lanchester, Fauna and Geogr. Maldivc and 



Laccadive Archipelagoe.';, vol. 1, p. 447, pi. 23, fig. 4 and 4a, 1903. 



The localities in the Indian Ocean from which the var. smithii has 

 been recorded include Zanzibar, Salomon, Peros, the Maldive and Mergui 

 Archipelagoes, the Andamans and the coasts of Burma and Ceylon. 

 Previous records from the Pacific Ocean include a locality north of 

 Australia, the Loyalty Islands and Rotunia. 



Two specimens, females, having the characteristics of this variety 

 were collected at Palmyra Island. Both are very small, the larger being 

 30 mm. in length. In both specimens the median carina of the telson 

 terminates posteriorly in a spine and the anchor-flukes are distinct. Figure 

 3, g, represents the features of the telson of a Palmyra specimen. 



