1898-1902. No. 18.] CRUSTACEA. 21 



Remarks. - This form is very nearly related to P. longicauda 

 PHILIPPI (= Scutellidium thisboides Glaus), but is of rather larger size 

 and differs slightly in the general shape of the body, as also in the 

 structure of the last pair of legs. The form recorded by TH. SCOTT 

 from Franz Josef Land as Scutelldium thisboides CLS. is in all pro- 

 bability the present species and not that of GLAUS. 



Occurrence. - - A single fully adult female specimen and some 

 immature ones of this form were found in a bottle of specimens taken 

 on July 12, 1908, in the bay at Land's End. 



Distribution. Northern part of the Pacific together with Zaus 

 Aurelii (POPPE); Franz Josef Land (SCOTT). 



87. Machairopus minutus, G. 0. SARS. 



Some specimens of this form, described by the present author from 

 the Norwegian coast, were found in 3 of the bottles. 



88. Idysea 1 fur cat a (BAIRD). 



Found rather abundantly in several of the bottles. 



89. Idysea ensifera (FISCHER). 



Several specimens of this form were also found in the bottles. 



90. Idyasa gracilis, SCOTT. 



Only a few specimens of this form were found in one of the bottles 

 containing specimens taken on July 12, 1900, in the bay at Land's End. 



91. Idyasa finmarchica, G. 0. SARS. 



Of this species, described by the present author from the Finmark 

 coast, a solitary female specimen was found in the same bottle as 

 the preceding species. 



92. Idysea in flat a, G. 0. SARS, n. sp. 



(PI. III). 



Specific Characters. Female. Body comparatively short 



and stout, sub-pyriform in outline, with the anterior division greatly in- 

 flated in its anterior part. Cephalic segment large and broad, obtusely 

 rounded in front, with the rostral projection very slight. Epimeral parts 



1 By this slight change (the interposition of an ce) I think that the Philippian 

 genus may be retained. The name Idya had been previously given by 

 BLAINVILLE to a genus of Acalephae. 



