259 



5- Pinnotheres onychodactylus n. sp. PI. 17, Fig. 5. 



Stat. 172. Between Gisser and Ceram Laut. Depth iS m. On reef. 3 9 (ovig.). 



This species much resembles /-". rhombifer BUrger, which, perhaps, is nothing but 

 P. palaensis Burger, from which P . rhombifer is only distinguished by having the penultimate 

 pair of legs shorter than the last pair. In the "Siboga" specimens the carapace, the breadth of 

 which is ly., times its length, agrees with those of the two named species of Burger; it is very 

 much vaulted, with bulging hepatic and branchial regions, without sculpture, completely naked 

 and very thin. The front is thickened, not prominent, and the eyes are not visible from above. 



The merus-ischium of the external maxiUipeds is very broad, its outer (anterior) border 

 much curved, and the inner border .straight, passing with a distinct angle into the distal margin, 

 along which long hairs are implanted. The carpus (fig. 5^) is short, the propodus is much 

 longer, its breadth at the insertion of the dactylus is 2Y., times its length, the dactylus is 

 narrow, styliform , reaching very little beyond the rounded distal end of the 

 propodus. The palm of the chela is inflated, about lY^ times as long as the fingers; the 

 latter are thick, curved towards the tip, the fixed finger is hairy beneath and the dactylus has 

 the usual tooth, which is very small in this .species, near the base of the inner margin. 



The walking legs are slender and elongate, 2^ and 3*^ pair are the longe.st, twice the 

 length of the carapace, but the 2^ pair is slightly thicker, the 4"^ pair is somewhat more than 

 half the length of the preceding pair and much more slender. The distal end of the 

 sabre-shaped and elongate propodites, as well as the dactyli, are provided 

 with a few silky hairs. The dactyli of the first three pairs (fig. 5(5) are two-thirds the 

 length of the propodite, much flattened, broadest in the middle, where they nearly attain the 

 breadth of the preceding joint, ending in a fine, curved tip; the inner margin of the dactylus 

 is straight, the outer convex ; in the fourth pair (fig. 5 c) the dactyli are very slender, not 

 flattened, longer than the preceding propodites and also distinctly longer than those 

 of the third jaair, which latter are subequal to those oft he preceding pairs. 

 This character brings the species nearer to P . coarctatus Burger, P. tenuipes Burger, P. borra- 

 dailei Nobili etc.; it is especially to the latter species (= P. tenuipes Borradaile nee Burger) that 

 it bears a great resemblance, but in Borradaile's species the length of the carapace is nearly 

 equal to its breadth, the dactyli of the walking legs are apparently less broadened and the 

 dactylus of the external maxillipeds reaches exactly to the end of the propodus. 



The eggs are very numerous and small, measuring 0.285 mm. in diameter. 



Dimensions in mm. : 



Length of carapace 6.8 



Breadth of carapace 8.8 



Length of 3d pair of walking legs . 11.55 

 Length of 4'^ pair of walking legs. 6.35 



6. Pinnotheres latns Bijrger. 



Stat. 53. Nanganiessi Bay, Sumba. Depth up to 36 m. i 9 j"v. 

 Stat. 231. Ambon. Depth 40 m. i 9 ovig. 



Ill 



