PLESIOCHELFIDJE. 195 



Hylseochelys (?) lata (Owen T ). 

 Syn. Plastremys lata, Owen 2 . 



Very imperfectly known and at present not admitting of exact 

 definition ; anal shield of plastron confined to xiphiplastral. 

 Hab. Europe (England). 



R. 48. The imperfect shell ; from the Upper Greensand of the Tsle 

 of Wight. Noticed by Owen, in the ' Quart. Journ. Geol. 

 Soc' vol. xxxvii. p. 370, as Plastremys, of which it is the 

 type, but without sufficient description. The greater part 

 of the right side of the plastron and the dorsal aspect of 

 two costals are seen. The latter show that the vertebral 

 shields were of the extreme width characteristic of this 

 genus ; the wide inframarginals are also shown, while the 

 absence of a mesoplastral is likewise indicated. 



Purchased, 1880. 



Genus PARACHELYS, Meyer 3 . 



Imperfectly known, but probably identical with Plesiochelys, in 

 which case the present name should stand, and the family name 

 Parachelyidce replace that of Plesiochelyidce. Number of phalan- 

 geals of manus as in Idiochelys. 



It was pointed out by Riitimeyer 4 that the maims of this genus 

 resembles that of Idiochelys. Zittel 5 identified Parachelys with 

 Eury sternum, considering the number of phalangeals abnormally 

 reduced. 



Parachelys eichstsedtensis, Meyer 6 . 



Syn. Parachelys eichstattensis , Meyer 7 . 



The type species. 



Hah. Europe (Bavaria). 



The following specimens are the types, and were obtained from 

 the Lower Kimeridgian lithographic limestones of Eichstadt, Bavaria. 

 They form a part of the Yan Breda Collection. Purchased, 1871. 



42888. Slab showing fragments of the carapace and plastron. 



(Fig.) Figured by Meyer in the ' Palssontographica,' vol. xi. 

 pi. xlv. fig. 1. The portion of the carapace is seen from 

 the dorsal aspect, and comprises part of the left side of 

 the anterior extremity, showing part of the nuchal, the 



1 Quart. Journ. Geol. Soc. vol. xxxvii. p. 370 (1881). — Plastremys. 



2 Loc. cit. 3 Palaeontographica, vol. xi. art. 6, p. 289 (3864), 



4 N. Denkschr. schw. Ges. Nat. vol. xxv. art. 2, p. 140. 



5 Palseontographiea, vol. xxv. p. 182. & Loc. cit. 7 Loc. cit. 



o2 



