201 



long as those of preceding pairs, in the 3'' pair the dactyli are provided with very 

 short, microscopical hairs, curved backward, in the 4"^ pair with longer hairs, directed towards 

 the tip. It is also remarkable that the first two pairs of walking legs ofmy 

 specimen are more robiist and their meropodites are longer than in the 

 much weaker following pairs. 

 Dimensions in mm. : 



Fronto-orbital distance 1.43 



Length of carapace 3.95 



Breadth of carapace 4.5- 



l of ist and 2<i pair of walking legs . 0.45 

 Length of dactyli l r ^ , .u ■ r 



•^ j of 3a and 4th pair of walking legs . 0.9 



8. Pinnotheres quadrahis Rathbun. PI. 17, Fig. 2. 



Stat. 34. Labuan Pandan, east coast of Lombok. Depth iS m. i cf. In Ar ca. 



Stat. 152. Wunoh Bay, north-vvest coast of Waigeu Island. Depth 32 m. i 9 o^ig. In Ar ca. 



This species is certainly closely related to the preceding, as regards the shape of the 

 carapace and the relative length of the dactyli of the walking legs, but differs by the dactylus 

 of the external maxillipeds being very minute. The carapace is subcircular, but the anterior 

 angles are pronounced ; as usual, the carapace of the 9 is more vaulted, the front less prominent 

 and the chelae are less inflated than is the case in the cf • In the former sex there is a triangular 

 depression on the cardiac region, which depression is not observed in the cT, but here the 

 whole surface is covered with an elegant reticulation of pigment. Length and breadth of carapace 

 are subequal and its posterior margin is regularly convex in the ^ , but concave in the 9- 



The merus-ischium of the external maxillipeds is a broad plate, with the inner (posterior) 

 margin slightly concave and the antero-internal angle pronounced-, the propodus is elongate 

 and broad, reaching beyond the antero-internal angle of the merus, as in Miss Rathbun's 

 specimen ; the dactylus is very minute and (in the cf) does not even reach to the antero-internal 

 angle of the merus, as it does in the 9- 



The 3'^ pair of walking legs is slightly the longest, and the 4'"^ the smallest (Miss 

 Rathbun, however, states that the last pair is longer than the 2'^ and i^' pair); propodites 

 hairless, dactyli of first two pairs equal in length, strongly hooked, those of 3'' and 4''' pair 

 about twice as long, hairy and slender, regularly curved. 



The abdomen of the c? seems to be broader than is the usual case in the genus, so 

 that the breadth at the base of the terminal segment distinctly surpasses its length. 



This very small species is recorded by Miss R.athbun from the Gulf of Siam. 



Dimensions in mm. : 



Fronto-orbital distance 



Length of carapace 



Breadth of carapace ; . . . 



l of ist and 2d pair of walking legs . 

 Length of dactyli i , , , , . ^ 



( of 30 and 4"! pair of walking legs 



113 



SIBOGA-EXPEDITIE XXXlXi'. 34 



