BELOIfGING TO DAPHNIA AND OTH£E ALLIED GENEEA. 237- 



1874, ? Daphnia vitrea and Daphnia apicata, Kurz., Dodekas 



neuer Cladoceren nebst iner Kurzen Ilbersicht der 



Cladocerenfauna Bohmens (LXX. Bande der Sitzb. 



derK.Akad.derWissensch.),pp.lO, ll,pl.I.,fig3.2,3. 



- 1877. ? Daphnia galeata, Hellich, Die Cladoceren Bohmens, 



p. 36, fig. 10. 



; 1877. „ cMCM^^fliffl!, Hellich, Die Cladoceren Bohmens, 



: _ p. 37. 



1886. ,, cMcz<^/fl^ifa, Eylmann, Beitrag zur Systematik 



der europaischens Daphniden (Berichte der 



l^aturforsch. Gesellsch. zu Freiburg), p. 40, 



t. lY., fig. 2. 

 1890. Hyalo daphnia Jardinii, Gr. 0. Sars, Oversigt af I^orges 

 Crustaceer II. (Christiania Yidens.-Selksk. For- 

 handl. 1890, IS'o. 1), pp. 10, 34. 

 (IS'ot D. Jardinii, Brady, Intellectual Observer, vol. XII., p. 419). 

 • Female. — Seen from the side the outline is narrow and elon- 

 gated, slightly higher behind the middle than in front ; the head 

 is conical in outline, occupies nearly half of the whole area of 

 the body and is only slightly narrower than the trunk ; in front 

 it is very obtusely pointed, its ventral margin curved in front, 

 but behind the middle almost rectilinear as far as the very obtase, 

 slightly rounded, and backwardly-produced beak : the dorsal 

 margin of the body is evenly curved throughout the region of 

 the head, behind which there is a slight depression, followed by 

 a gentle convexity as far as the base of the long spine which 

 springs from the middle of the posterior extremity and is bent 

 upwards with a gentle curve, its length being about equal to 

 that of the body exclusive of the head : ventral margin behind 

 the head evenly convex. The caudal laminae (fig. 13) have slender 

 and unarmed terminal ungues, the marginal teeth six to eight 

 in number and gradually decreasing in length from behind for- 

 wards ; dorsal abdominal processes short and confluent at their 

 bases. Eye very small, about one-eighth of the length of the 

 head. The shell is in no part distinctly reticulated, though 

 sometimes an indistinct reticulation may be made out over small 

 areas : for the most part it has a dotted or granulated appear- 

 ance. Length, exclusive of the spine, 1*5 mm. ; height, '65 mm. 



