Chelipeds in the cf moderately long, but by far not so much elongate as in the adult 

 cf of G. rhomboides, in which the meropodite exceeds the length of the carapace. In both 

 species the upper border of the meropodite presents a tooth or an obsolete tubercle, a little 

 beyond the middle of the border, and all three borders are rounded, but in the Indian species 

 the outer border bears a subdistal spine, the inner angle of the wrist is sharply produced, 

 depressed, and there is also a small, but distinct spine on the outer border, which spine is not 

 obsolete in my specimens as in that of Miers; the chelae are a little unequal, the right being 

 the larger, the palm is low and as long as the fingers, smooth, rounded below and somewhat 

 keeled above ; the fingers are closely fitting, greatly compressed, the fixed finger is sharply 

 keeled below, retaining its height at the base for nearly two-thirds of its length, then tapering 

 rapidly towards the very short, scarcely curved-up tip, the movable finger is regularly curved 

 in its distal half, more finely crenulate at its inner margin, at least in the case of the larger 

 chela, than its antagonist, near the base, however, it shows one large, obtuse tooth, directed 

 backward, which tooth is absent in the left chela. 



The ambulatory legs are slender; as in G. rhomboides\ the meropodites, save those of 

 the last pair, exhibit a subdistal spine at the anterior margin, and all are considerably narrowed 

 distally ; the dactyli are conical, very thin and finely pointed. 



The whole animal, which is of an ivory-white colour, is almost perfectly hairless, only 

 the walking legs bear some few short, widely-scattered hairs, even on the dactyli. In G. rhom- 

 boides the dactyli, which are flattened like those of Ocypoda, are fringed with dense, short hairs, 

 especially in the case of the first and second pair. 



Miers regarded his unique specimen as probably not being fully adult, on account of 

 its small size (length of carapace little more than 7 mm., breadth about 9.5 mm.). None of 

 the 10 "Siboga" specimens even attains this size and it may well be possible, that indeed the 

 species does not grow larger. 



Dimensions in mm : 



Greatest breadth of carapace (distance between external orbital angles) . 



Length of carapace 



Breadth of front at anterior margin 



The "Siboga" examples were got at exactly the same locality, whence the "Challenger" 

 obtained the hitherto only specimen. 



2. Goneplax maldivensis Rathbun. PI. 9, Fig. 1. 



1902. Goneplax maldivensis Rathbun. Bull. Mus. comp. Zool. Harvard Coll., v. 39, p. 124, 

 figs. 3—5. 



Stat. 204. Between Wowoni and Buton Island, south-east of Celebes. Depth 75 — 94 m. 2 cf juv. 



The carapace of this minute species is almost straight transversely and longitudinally, 

 but curved in its anterior part towards the front, which latter is perpendicularly deflexed ; the 

 surface is smooth, finely punctate anteriorly (I did not observe the "finer wrinkles" mentioned 

 by Miss Rathbun) ; there are faint traces of two epigastric lobes ; the gastric region as a whole 



35 



