237 



according to Buchholz, pale carneous. Length of adult female reaching to 8 mm. 

 Parasitic on Balanus balanoides Lin. 



Remarks. — As above stated, this form was first recorded by Sp. Bate as 

 a species of the genus Liriope of Rathke. About the identity of Buchholz's 

 Hemioniscus balani with Sp. Bate's species, there cannot, in my opinion, be any 

 doubt. It is the only species of the geniis found in northern latitudes. 



Occurrence. — I have not myself found this form; but its occurrence in 

 Norway is stated by Dr. Buchholz, who found it at Christiansand on the com- 

 mon littoral barnacle (Balanus balanoides). In all probability it is distributed 

 along the greater part of the Norwegian coast, as is the barnacle on which it 

 lives as a parasite. The figures here given are from a specimen kindly sent me 

 by Dr. Buchholz. 



Distribution. — British Isles (Sp. Bate). 



den. 3. ASCOniSCUS, G. 0. Sars, n. 



Generic Characters. — Body of adult female constituting a simple pouch, 

 without any traces of segmentation or projecting lobes, affixed to the host only 

 by the aid of the shed larval skin still adhering to the pouch. Male (and last 

 larval stage of female) resembling in outward appearance that of the 2 preceding 

 genera, but differing in the fact that the basal expansion of the antennulse and 

 the coxal plates are not pectinate, as also in the fuller development of the outer 

 ramus of the uropoda. Parasitic in the incubatory pouch of deep-water Mysidse. 



Remarks. — This new genus is founded upon an Epicarid, the retrograde 

 development of which has attained its maximum, the adult female being reduced 

 to a quite simple soft pouch containing the generative organs. The male, how- 

 ever, exhibits on the whole the usual structure, though differing in some particu- 

 lars rather pronouncedly from that of the 2 preceding genera. In any case 

 there cannot be any doubt that the present genus ought to be placed within the 

 family Cryptoniscidos. 



