PROTOCARDIA. 197 



from Haldon, wliicli resemble in sliape the higher forms of P. ffpliseroidea, but the 

 umbones are narrower and more curved, and tlie carina is more distinct. 

 Better specimens are needed before a satisfactory comparison can be made. The 

 occurrence of F. sphseroidea in the Upper G-reensand (zone of Pecten asper) of 

 Wihshire has been recorded by Mr. Jukes-Browne. 



Protogaudia, sp. Ph^te XXXI, fig. 5 a, b. 



Description. — Shell globose, witli rounded outline, slightly inequilateral, height 

 and length nearly eipial. Umbones low, curved anteriorly. The posterior 

 part of the shell (except near the postero-dorsal margin) is ornamented with from 

 ten to twelve strong radinl ribs; the remainder of the shell bears numerous, small 

 concentric ribs. 



Ajfinitie.i. — This species resembles P. peregrinorsa (d'Orbigny),^ but the area 

 with radial ribs is relatively larger, and the concentric ribs are finer. 



Remarkx. — The only specimens seen are two iu the Museum of Practical 

 Geology and two in Mr. Lamplugh's collection. 



Dititriliiiiinn. — Speeton Clay (zone of Pelemnites latendi.i, D, 4) of Speeton.- 



PuoTOCAiiDiA Hii.LANA {Soioerbij), 1813. Plate XXXI, figs. G a—c ; Plate XXXII, 



fig. 1—0. 



1813. Cakdium Hillanum, J. Sowerly. Miu. Couch., vol. i, p. 41, pi. xiv 



(upper figure). 

 1819. — — Lamarrk. Hist. u;it. Auiiii. sans Vert., vol. vi, p. 20. 



1837. — —A. Goldfuss. Petret. Germ., vol. ii, p. 220, pi. exliv, 



fig. 4. 

 — — — F. Dujardin. Mum. Soc. gcol. de France, vol ii 



p. 224. 



1840. — — H. B. Geliiitz. Char. d. Schicht. u. Petrcf. des 



siichs. Kreidegeb., pt. 2, p. 53. 



1841. — - F. A. Riimer. Die Verstein. d. nord-deutsch. 



Kreidegel)., p. 71. 



1842. — ]\KtiUKNiAisui\], r. Matlnron. Catal. Foss. du Depart, des 



Bouches-du-Rhone, p. 157, 

 pi. xviii, fig. 6. 



' 'Pal. Fran^. Terr. Cret.,' vol. iii (1844), p. 1(!, pi. cixxxix, figs. 1 — 3; Pictet and Campiche, 

 • Terr. Cret. Ste. Croix ' (' Mater. Pal. Suisse,' ser. 4, 1866), p. 254, pi. cxxi, figs. 1, 2. 



- Internal easts of a globose and nearly e(|uilater:il " Canlium" (perhaps ProtocanUn), from the 

 Spilsby Sandstone ot Douniugton, are in the Sedgwick Museum. 



2G 



