37 



6. Notodelphys elegans, Thorell. 



(PI. XVIII, 2). 



Notodelphys elegans. Thorell, 1. c. p. 39, PI. IV, o. 



Specific Characters. Female. Body less slender than in any of the 

 preceding species, with the cephalic segment comparatively large, considerably 

 exceeding the length of the 2 succeeding segments combined. Incubatory pouch 

 nearly of equal width throughout and obtusely truncated behind. Caudal rami 

 shorter and broader than in N. tenera, only 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 occurring at a short 

 distance from the apex. Antennae comparatively far less slender than in the 

 said species, the posterior ones being in particular distinguished by the unusu- 

 ally short and stout terminal joint. Last pair of legs very unlike those in 

 N. tenera, the proximal joint being nearly quadrate in form and finely denti- 

 culate inside, with the digitiform process extending straight backwards; distal 

 joint broadly oval in form and scarcely at all constricted at the base, spine 

 of inner edge rather strong. 



Body of the living animal, according to Thorell, of a pale yellowish hue, 

 with the ripe ova fuscous green. 



Lenght of adult female about 3 mm. 



Remarks. This species may be easily distinguished from the preceding 

 ones by the less slender form of the body and the shape of the incubatory 

 pouch. The structure of the posterior antennae, and more particularly that of 

 the last pair of legs, is also rather peculiar. Moreover the caudal rami, as 

 usual, exhibit some well marked distinguishing characters. 



Occurrence. Two or 3 female specimens only of this form have as yet 

 come under my notice. They were selected from some material collected on 

 the south coast of Norway, the exact locality not being noted. Thorell found 

 this species within the branchial cavity of Styela intestinalis. 



Distribution. Coast of Bohuslan (Thorell), coast of France (Canu). 



7. Notodelphys prasina, Thorell. 



(PI. XVIII, 3). 



Notodelphys prasina, Thorell, 1. c. p. 41, PI. V, 7. 

 Syn : Notodelphys pusilla, Buchholtz. 



Specific Characters. Female. Body comparatively short and stout, con- 

 siderably dilated in its anterior part. Cephalic segment rather large, and 

 conically produced in front. Incubatory pouch subquadrangular in outline, 



