OS BOSMINID.35, MACEOTHKICIDJD, ETC. 393 



16. Lynceus uncinatus, (Baird). PL XVIII, fig. 9; and 

 PI. XXI, fig. 13. 



1850. Pleuroxus uncinatus, Baird. Brit. Entom., p. 135. PI. 

 XVII, fig. 4. 



1860. Lynceus uncinatus, Leydig. Naturgeschichte der Daph- 

 niden, p. 228. 



1860. Lynceus personatus, Leydig. Naturges. der Daphniden, 

 p. 227. PL IX, fig. 70. 



1862. Rliypophilus glaber, Schoedler. Die Lynceiden u. Poly- 



phemiden der Umgegend von Berlin, p. 26. 



1863. Rhypophilus glaber, p. 55. PL III, figs. 54-56; Rhi- 



pophihcs uncinatus and personatus, p. 56, Schoedler. 

 Neue Beitrage zur Naturgeschichte der Cladoceren. 



In most respects as the last, bnt the dorsal margin is more 

 boldly arched, and the infero-posteal angle has three or four 

 large (instead of minute) teeth; the surface of the valves is 

 either smooth or reticulated, the reticulations being pentagons, 

 hexagons, or heptagons ; and the marginal spines of the abdomen 

 are very much larger and fewer in number. The character how- 

 ever which at once distinguishes it from all our known Lyncei 

 is, that the extremity of the long acute rostrum is bent upwards 

 and backwards, and thus assumes a hook-like form. Length, 

 iVnd of an inch. 



" Pond between Han well and Southall, Middlesex," Dr. Baird; 

 Green Lee Lough, Northumberland, A. M. N. ; East Belsay and 

 Wallington Lakes, Northumberland ; Oakermoor Loch, South 

 and North Shaws Lochs, Selkirkshire ; Lochmaben, Dumfries- 

 shire, G. S. B. ; Paisley Canal, near Glasgow, Mr. D. Robertson. 

 Abroad it has been found in Prussia and Norway. 



It is not without hesitation that we have adopted the name of 

 uncinatus for the species which we have described, which is cer- 

 tainly the personatus of Leydig, and in another state the glaber 

 of Schoedler. All the specimens that we have seen are either 

 reticulated or devoid of sculpture. We have never met with 

 any obliquely striated as represented in Dr. Baird's figure ; and 



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