214 



upper part of the Christiania Fjord. Owing to its small size, it is not easy to 

 detect the parasite when still attached to its host, and it was indeed only after 

 immersion of the starfishes in a feeble solution of alcohol that, by an ex- 

 amination of the bottom-residue of the bottle. I succeeded in getting sight 

 of the detached parasites. The greater number of the specimens thus secured 

 were of the male sex, and only very few female specimens were obtained, 

 among them a fully adult ovigerous one, that here figured. Mr. A. Scott has 

 procured this form by the same proceeding from starfishes collected of the 

 British coast. 



Distribution. British Isles (Scott), 



Page 172. Add the following species: 



Pseudanthessius dubius, G. O. Sars, n. sp. 



(PI. CX VII). 



Specific Characters. Female. Body moderately slender, with the an- 

 terior division comparatively broad and regularly oval in outline, greatest 

 width equalling about 2 / 3 of the length and occurring in the middle. Cephalic 

 segment very large, and scarcely exhibiting any transversal suture behind, front 

 narrowly rounded. Last trunkal segment very small. Tail slender, equalling 

 in length about 2 /s of the anterior division, and only composed of 3 segments, 

 the 1st of which (the genital segment) is, as usual, much the largest and sub- 

 fusiform in shape, being divided in the middle by a transversal suture into 2 

 parts, the anterior one somewhat bellshaped, the posterior rapidly tapered; the 

 2 succeeding segments sharply marked off from each other, both of narrow 

 cylindrical form, fully twice as long as they are broad. Caudal rami very 

 slender and narrow, being nearly as long as the last 2 segments combined, 

 and slightly divergent; seta of outer edge attached somewhat beyond the 

 middle; apical setae rather unequal, the 2 middle ones being, as usual, much 

 longer than the other 2, which are very small, especially that attached to the 

 outer corner. Anterior antennae slender and narrow, being composed of the 

 usual number of joints clothed with moderately long setae; 2nd joint the largest, 

 last joint very small. Posterior antennae likewise rather slender, though a little 

 shorter than the anterior ones; 2nd joint about as long as the last 2 com- 

 bined; terminal joint armed at the tip with a single well-developed claw 

 accompanied by 5 strong curved setae. Maxillae not examined. Anterior max- 

 illipeds with the terminal process only slightly curved. Posterior maxillipeds 

 with the propodal joint fully as large as the basal one, and provided inside 



