113 
ined, that the specimen from the ,,Tjalfe" is mot. H. californiensis, 
and moreover I have no male. But the circumstance, that the host 
belongs to quite another genus /H. calif. lives on Pasiphæa pacifica), 
and that the locality besides is W. of America, seems to me to 
prove, that the specimen from the ,, Tjalfe" is a new species. 
The form is ovate and somewhat skew, the left side being a 
little longer than the right. The cephalon cannot be seen from 
below; it is very small and has a little longitudinal furrow, but is 
Fig. 15. 
Holophryxus Acanthephyræ. Dorsal, ventral and lateral view. 
not really bilobated; at each side of the cephalon there is a little 
Tounded prominence. On the dorsal surface of the thorax just be- 
hind the cephalon 2 transversal furrows are visible; otherwise 
there is no trace of "segmentation of the thorax (seen dorsally) 
exclusive of the existence of 4 longitudinal streaks on the dorsal 
surface, somewhat recalling the segmentation of the abdomen in the 
Paguridæ. The abdomen projects from the thorax as in the other 
Species. The coxal plates are the sole true trace of segmentation. 
There are 5 pairs of coxal plates corresponding with the 5 pairs of 
Pereiopods; the 4 first pairs are separated from the thorax by a seam, 
and the two plates of the first pair are connected by a frontal 
margin lying under the céphalon and forming the anterior boundary 
Vidensk. Meddel. fra den naturh. Foren. Bd. 64 8 
