On some South-African Phyllopoda. 



these eggs were at once hatched But, although the aquaria 

 at times literally swarmed with larvæ belonging to this 2nd 

 generation, none of them reached maturity, apparently owing 

 to the superabundance of their enemies (especially Cypridids) 

 at that time in all the aquaria. It appeared also that the 

 larvæ were to a great extent devoured by their own parents, 

 being involuntarily, by the swinging motions of the branchial 

 legs of the latter, whirled in between them, and together 

 with other small particles carried within the reach of the 

 oral parts. 



4. Estheria Elizabethæ, G. O. Sars, n. sp. 



(PI. IV). 



Specific Characters. — Shell of female moderately 

 tumid and, seen laterally, of broadly oval form, with the 

 greatest height somewhat exceeding 2 /3 of the length, um- 

 bones distinctly prominent, and occurring far in front of 

 the middle, dorsal edge behind the umbones nearly straight, 

 and terminating in a slight angle, ventral margin evenly 

 curved, anterior extremity obtusely rounded, posterior 

 obliquely expanded.— Shell of male somewhat less tumid, 

 and, seen laterally, considerably narrower, posterior angle 

 of dorsal edge obsolete, ventral margin less curved, being 

 nearly straight in the middle, anterior extremity obtusely 

 truncated, posterior considerably produced, and narrowly 

 rounded at the tip. Valves in fully grown specimens with 

 from 20 to 24 very distinct, ridge-like concentric ribs, placed 

 at rather regular intervals, and fringed in their posterior 

 part with short, flattened bristles, especially very distinct 



3 — Archiv for Math, og Naturv. B. XX. Nr. 4. 



Trykt den 16cle Februar 1898. 



