89 



insertions of the 1st pair of legs, and does not exhibit any trace of a transverse 

 striation. Maxillae with the inner lobe considerably produced and tapered distally, 

 the apical setae being likewise unusually slender; outer lobe very small. Max- 

 illipeds rather powerfully developed; claw of the anterior ones strong and much 

 elongated, with the end evenly curved and the concave edge finely ciliated through- 

 out. Natatory legs of normal structure. Last pair of legs nearly as in 

 A. Lilljeborgi. 



Male, as usual, smaller than female, and moreover easily recognisable 

 by the distinctly hinged anterior antennae and by the structure of the tail. 



Colour not yet ascertained. 



Length of adult female about 0.90 mm., of male 0.75 mm. 



Remarks. Brady erroneously considered this form to be identical with 

 .A. Lilljeborgi Thorell, and the change of the specific name was merely made to 

 distinguish it from Asterocheres Lilljeborgi of Boeck. The species is however in 

 reality quite distinct from both of those forms, though nearest allied to A. 

 Lilljeborgi Thorell, from which it is distinguished by the much shorter siphon. 



Occurrence. A solitary female specimen of this form was taken, many 

 years ago, at Bukken, SW coast of Norway, from some dredged material, and a 

 few additional specimens were picked up recently from the bottom-residue of a 

 large collecting-bottle containing a number of different invertebrate animals taken 

 at Rau0, west coast of Norway. I am of course unable to decide from what 

 hosts the specimens were derived nor is any information upon this point given 

 by Brady. 



Distribution. British Isles (Brady), ? Gulf of Naples (Giesbrecht). 



52. Ascomyzon simulans, Scott. 



(PI. LV). 



Ascomyzon simulans, Scott, Sixteenth Ann. Eep. of the Fisheries Board for Scotland, Part III, 

 p. 270, PI. XIII, figs. 19, PI. XIV, fig. 22. 



Specific Characters. Female. Anterior division of body less broad than 

 in the preceding species, the greatest width being much smaller than the length. 

 Cephalic segment of moderate size and evenly rounded in front. Lateral parts 

 of the 2 succeeding segments obtusely rounded, those of the last 2 segments 

 slightly angular. Tail very short, scarcely l / s the length of the anterior division; 

 genital segment considerably dilated, being even somewhat broader than it is 

 long; anal segment about the length of the preceding one and somewhat con 

 tracted behind. Caudal rami exceedingly small, being broader than they are 



12 Crustacea. 



