22 ZOOLOGISCHE MEDEDEELTNGEN — DEEL IL 



The characteristics of the true Pallenojms-sipecies are: 



1°. Body slender, distinctly segmented, lateral processes separated. 



2°. Feet long and thin. 



3°. Male ovigers strong, ten-jointed. 



4°. Female ovigers much shorter and weaker, ten-jointed. 



5°. Eyes as a rule small ; sometimes rudimentary or wanting. 



6°. Auxiliary claws small (at the utmost nearly half of main claw), 



minute or wanting. 

 7°. Scape of chelifores two-jointed. . 

 8°. Mostly found in deep water; some species occurring also in 



shallow water. 



The sub-genus Rigona is distinguished by the following points: 



1°. Body short, the segments grown together, lateral processes not 

 separated, often coalesced. 



2°. Feet short, thick-set and robust. , 



3°. Male ovigers normal, ten-jointed, strong. 



4°. Female ovigers reduced, much feebler, at the most nine-jointed; 

 segments more or less coalesced. 



5°. Large eyes; ocular tubercle clumsy. 



6°. Auxiliary claws long, from over half the main claw to five- 

 sixths of it. 



7°. Division of immovable scape of chelifores indistinctly or scarcely 

 visible. 



8°. Found in shallow water. 



Besides Pctllenopsis fluminensis of different authors 13. P. spicata 

 Hodgson, 16. P. sibogae Loman and 31. the Japanese species of the 

 Sagami-Bay do not square with this scheme. Their holotypes need renewed 

 and closer inquiry before we can judge of them. 



Pallenopsis (Rigona) aculeata n. sp. 



Occurrence. Dunedin, New-Zealand, 4 9- Depth? Collection Leiden 

 Museum. K. Suter. 



Trunk indistinctly segmented (Fig. A), the somites grown together. 

 Lateral processes likewise coalesced, with two or three very small conical 

 tubercles distally. First segment equal in length to the two following, 



