Prof. Rupert Jones — Tertiary Entomoatraca. \^o 



voisin, mais distinct, .auqucl doit Gtro attriljuu lo nom do Plagiolophus, 

 PomcL' 



The first volume of Pictot's " Piiluontologio " was published in 

 1853. Tho " Memoiro " from wliicU tlio extract just quoted is 

 given, appeared in 1855; so that if M. Pictot rectified tho character 

 of Paloplotheriiim in tho former year, ho rectified his rectification in 

 the latter. 



As the originator of tho error by wliich Pictot w^as misled now 

 admits (what was very well known before) that the genus Palop- 

 lotheriiim was founded upon a mistake, '^ of course it disappears from 

 zoological nomenclature, unless, indeed, it be retained for M. 

 Gaudy's P. codiciense, wliich is very different from Flayiolophus. 



March, 21, 1870. 



EXPLANATION OF PLATE VI. 

 The right ramus of the mandible of a young FalcBotheriam magnum, of the natural 

 size, with three milk molars. From the Eocene of Vaucluse. 



A. Viewed from the outer side. 



B. '1 he crown of the teeth seen from above. 



C. Viewed from the inner side. 



I 



IV. — Notes on the Tertiary Entomostraca of England. 

 By Prof. T. Rupert Jones, F.G.S., of the Royal Military College, Sandhurst. 



N the February number of the Geological Magazine is a revised 

 list of the Cretaceous Entomostraca, described and figured in 

 my Pal. Soc. Monograph of 1849 ; and I now propose to offer a 

 revision of the Tertiary Entomostraca published in my Pal. Soc. 

 Monograph of 1856. The general observations on the subject 

 offered in February will hold good in this instance also. A cor- 

 rected list of the generic and specific names is appended ; and to 

 this the numbers in the following notes refer. 



No. 1. Mr. G. S. Brady has pointed out (Monogr. Eecent Brit. 

 Ostrac, Trans. Linn. Soc, vol. xxvi., 1868, p. 382) that this must be 

 the same as Candona compressa, Koch, sp. 



No. 3. Mr. Brady (op. cit. p. 374) refers this to Miiller's Cypris 

 Icevis. 



No. 5. This is a Cypris according to Mr. Brady {op. cit. p. 370). 



Nos. 6 and 7. These were referred to Candona, on account of 

 their general agreement in shape and lucid spots with the foregoing 

 (No. 5) ; but, like it, they may really belong to Cypris. 



No. 9. Mr. Brady finds this living in the British Seas (op. cit. p. 

 408). 



No. 10. Mr. Brady has taken great trouble with this species. He 

 believes it to be a true Cytheridea ; and he regards the smooth form 

 (Monogr. Tert. Entom. pi. 2, fig. le) as belonging to a different 

 species {C. littoralis). There has been much confusion in the 

 nomenclature of this species, which, with some allies, has been found 

 in several localities ; but Mr. Brady has done much to clear up the 



^ Memoire sur les Animaux Vertebres trouves dans le Terrain siderilitique du 

 canton de Vaud (p. 36). 

 ' See the last number of the Geological Magazine, p. 143. 



