PHARUS. 27 
Family—SOLENIDA, Lamarck. 
Genus—Puarvus, Leach in J. H. Gray, 1847. 
(‘Synops. Brit. Mus.,’ ed. 42, 1840, p. 154; ‘Ann. Mag. Nat. Hist.,’ vol. xx, 1847, p. 272; 
and ‘ Proc. Zool. Soc.,’ 1847, p. 189.) 
Puarus Warsurtont (Forbes), 1845. Plate XXXV, figs. 1—3. 
1845. Sonecurtus Warsurtoni, HL. Forbes. Quart. Journ. Geol. Soe., vol. 1, 
p. 287, pl. ui, fig. 1. 
1850. — — A. @Orbigny. Prodr. de Pal., vol. ii, p. 117. 
1854. — — J. Morris. Cat. Brit. Foss., ed. 2, p. 224. 
1864. — = F. J. Pictet and G. Campiche. Foss. Terr. 
Crét. Ste. Croix (Mater. Pal. 
Suisse, ser. 4), p. 30. 
1879. — — F. Stoliczka. Paleeont. Indica, Cret. Fauna S. 
India, vol. 111, p. 99. 
Description.—Shell elongate-oblong, compressed, shghtly inequilateral, gaping 
at the ends, the posterior higher than the anterior part. Dorsal margin 
almost straight. Ventral margin slightly flexuous, and slightly oblique to the 
dorsal margin. Anterior margin rounded. Posterior margin slightly truncate, 
rounded. Umbones small, inconspicuous, sub-median. Ornamentation consists of 
growth-rings, and on the anterior part of the shell, of numerous, very small, rather 
irregular, radial ribs. 
Measurements : 
(1) (2) (3) (4) 
Length . 67 6055": 59 : 44. mm. 
Height . 17 ; 16 2 15 : 2: 
(1—4) Crackers, Atherfield. 
Affinities —This species, as was pointed out by Stoliczka, closely resembles in 
form living examples of the genus Pharus ; but the hinge appears to be unknown, 
for although the species is well represented in collections, and the specimens are 
in an excellent state of preservation, none of them shows the interior of the shell. 
A single valve resembling P. Warburtoni, but relatively higher, has been described 
by Dr. Kitchin! from the Uitenhage Series. Dr. Harbort? states that his Solecurtus 
longovatus is similar to our species, but is relatively higher and shorter. 
1 «Ann, 8. African Mus.,’ vol. vii (1908), p. 155, fig. 1. 
2 «Die Fauna d. Schaumburg-Lippe’schen Kreidemulde’ (1905), p. 71, pl. viii, fig. 6. An 
imperfect internal cast found in the Upper Greensand of Devizes shows some resemblance to this 
species. 
IQ 
ade 
