GRAPSOIDEA. 327 



nates in a short point, very slightly elongated. The anterior surface 

 of the fifth joint in the second and third pairs of legs has two dense 

 lines of short hairs j on the second pair the smallest line is below the 

 medial one, and on the third pair it is above. In other respects, the 

 specimens are essentially identical. 



Variety longicornuta. Plate 20, fig. 4 a, male, natural size ; b, 

 abdomen and sternum ; c, larger hand, natural size ; d, extremity of 

 leg of third pair ; e, outer maxilliped. 



Tongatabu, Pacific ; also, from Singapore. 



This variety has the long horn of the ceratopldlialma (0. cursor), but 

 the carpus has a regularly convex surface, as in the brevicornis. In 

 nearly all its characters excepting the horn of the eye, it agrees with 

 the brevicomis. But the basal joint of the inner antennas appears to 

 be more globular and less oblong. 



Tongatabu specimen, a male. Length of carapax, seventeen lines; 

 greatest breadth, nineteen and two-thirds lines ; ratio, 1 : 1"15. The ante- 

 rior angle of the carapax is a right angle ; it does not project forward of 

 the upper orbital margin adjoining it. The breadth of the body is as 

 great in front as over the third pair of legs. The horn of the eye is 

 cylindrical, and as long as the eye to its basal articulation. The third 

 joint of the outer maxillipeds is somewhat oblong, and near either 

 margin granulous. The large hand is coarse granulous, somewhat 

 spinous above, and short spini-dentate below. The hand anterior 

 to the fingers is nine and a half lines broad, and the same in length, 

 measuring the length to the posterior margin above the articulation. 

 Inner surface of hand granulous below and above, and dense hairy in 

 an oblique line near the articulation. Carpus similarly granulous. 

 Arm unevenly spini-dentate on anterior margin. Eight posterior 

 legs without hairs on the margins, surface granuloso-rugate ; anterior 

 surface of fifth joint of second and third pairs with two or three dense 

 rows of short hairs j tarsus widened towards extremity. Abdomen of 

 male with penult joint not narrower at middle than at base, last joint 

 triangular, slightly oblong. 



Specimen from Singapore, a female. Length of carapax, six- 

 teen lines j breadth, eighteen and a half lines j ratio, 1 : 1*16. In 



