34_ 



Body, according to Thorell, in the living animal pellucid, of a whitish 

 grey colour, with the ovarial tubes and the ripe ova pale reddish. 



Length of adult female attaining 4.20 mm. 



Remarks. The present form is so closely allied to N. Allmani, that I 

 have had much trouble in finding any more reliable character to distinguish 

 it from that species. It is however of somewhat smaller size, and, on a closer 

 comparison, the caudal rami are found to differ somewhat in their relativ 

 length, and more particularly in the position of the outer-edge bristle, which 

 is conspicuously more remote from the apex than in N. Allmani. Moreover 

 the shape of the incubatory pouch is rather different, and, according to Thorell, 

 also the colour of the ovarial tubes and the ripe ova in the living animal. 



Occurrence. A few female specimens of this form were selected from 

 some material collected many years ago off the south coast of Norway. From 

 what species of Ascidia they were derived, I am unable to ascertain. Thorell 

 found it in A. scabra Mull, and Aurivillius in Phallnsia obliqva Alder. 



Distribution. Coast of Bohuslan (Thorell, Aurivillius). 



3. Notodelphys caerulea, Thorell. 



(PI. XVII, 2). 

 Notodelphys ccernlea, Thorell, 1. c. p. 37, PI. Ill & IV, 4. 



Specific Characters. Female. Body conspicuously more slender than in 

 the 2 preceding species, with the anterior division narrower and the posterior 

 more produced. Incubatory pouch oval in outline, with the greatest width 

 somewhat in front of the middle, posterior extremity evenly rounded. Caudal 

 rami rather shorter and broader than in the 2 preceding species, only very 

 slightly exceeding in length the anal segment, and scarcely more than 3 times 

 as long as they are broad; apical setae comparatively short, bristle of outer 

 edge considerably remote from the apex, being attached nearly in the middle 

 of the edge. Antennae, oral parts, and natatory legs not exhibiting any marked 

 difference from those appendages in the preceding species. Last pair of legs, 

 however, rather different in shape, the proximal joint being not nearly so 

 broad, with the inner corner less prominent; distal joint rounded in shape and 

 less conspicuously constricted at the base. 



Body in the living animal whitish pellucid, with the ovarial tubes and 

 the ripe ova of a bright bluish colour. 



Length of adult female attaining 4.30 mm. 



