42G CRETACEOUS LAMELLIBRANCHIA. 



AsTAUTK (Eku'Iiyi.a) concikna, Sourvh)/, 183G. Plate XVII, fig. 7 (soc p. 



llG-118). 



Wlion dcscril)in!4- the species of A.^fartr the only specimen of A. covcinva 

 known Avas the type, and I regarded it as probably only an individual variation of 

 A. Kfriafa. Dr. Kitchin' has since fonnd several specimens in the Sandgate Beds 

 of a pit-sinking at Dover which agree with .1. coiiniina, and he considers that 

 this should be regarded as a distinct species. Dr. Kitchin also obtained -I. {Krijilii/hi) 

 shiiilii, tSowerby, from the same place. 



ClIASSA'J'ELLlTES, SJ). [Omitted from Vol II, p. 130.] 



Internal casts of a short subqnadrate shell, probably belonging to the genus 

 Cfdi^xiif'-lUtes, occur in the Chloritic Marl of Maiden Bradley and Devizes. 



Ckassatelijtes ? EQUisuLCATUS {Wno,]s), 1807. Plate LXT, figs. 20, 21 . Plate LXII, 



fig. 1 . 



[Omitted from Vol. II, p. 130.] 



1897. Aectica? equistjlcata, H. Woods. Quart. Jouru. Geol. Soc, vol liii, 



p. 391, pi. x.Kviii, figs. 6 — 8. 



Description. — Shell convex, subqnadrate, oblique, very inequilateral. Undjones 

 anterior, pointed, with slight forward curvature. Greatest convexity between 

 the umbones and the postero-ventral extremity ; postero-dorsal part compressed. 

 Adductor inq)ressions di.stinct, the posterior one deep. Shell i-ither thick, 

 ornamented with numerous concentric ribs, separated l)y nai'ivw grooves. 



licmarloi. — The systematic position of this species is uncertain; it appears to 

 be closely allied to the form from the Chloritic Marl mentioned above. 



Type.— In the Sedgwick Museum. 



Disfrihntion. — Chalk Rock of Cuckhamsley, Berkshire. 



Anthonya, sp. [Vol. II, p. 130.] 



A portion of a left valve of AntJiouiia closely resembling A. nnitidud has been 

 found in the Upper Greensand (zone of I't'dm anper) of Kingskerswell, Devon 

 (Museum of Practical Geology, Jermyn Street, No. 997.) 



1 Lamplugli aud Kitchin, ' Mesozoic Eocks in the Coal Explorations in Kent" (iKll), p. 103. 



