92 MB. H. WOODS 03ST THE MOLLTJSCA. [Feb. 1 896, 



Distribution. — England : Chalk Rock of Cuckhamsley, and Under- 

 wood Hall near Dullingham ; Saxony.-. Planer-Kalk of Strehlen, 

 Planer-Mergel of Walkmiihle near Pirna, etc. ; Bohemia : through- 

 out the Turonian and in the Priesen and Korycan Beds of numerous 

 localities ; Bavaria : Grossberg Beds. 



Family Cerithiidse (Ferussac), Menke. 

 Genus Ceeithium, Adanson, 1757. 

 Oeeithium ctjckhamsliense, sp. nov. (PI. IV. fig. 11.) 



Description. — Shell elongate, composed of about twelve whorls. 

 Spiral angle 21°. Whorls flat or very slightly convex, with a 

 narrow anterior part sloping steeply to the suture ; surface smooth 

 or with growth-lines. Aperture imperfectly known. Length (ap- 

 proximative) 38 mm., width 14 mm. 



Affinities. — This species resembles C. excavatum of Brongniart, 1 

 from the Gault, but in that form the whorls are more concave, and 

 the sutures are bordered by two ridges. 



Distribution. — Chalk Bock of Cuckhamsley and Luton. 



Ceeithium Saundeesi, sp. nov. (PI. IY. fig. 12.) 



Description. — Shell elongate, turrited, composed of twelve whorls. 

 Spiral angle 18°-19°. Whorls nearly flat ; sutures fairly distinct. 

 Ornamentation consists of round tubercles having a transverse and 

 longitudinal arrangement ; there are four longitudinal rows of equal 

 size, and about sixteen transverse rows on each whorl. The longi- 

 tudinal rows are separated by less than the diameter of a tubercle ; 

 the transverse are more distant. Between the longitudinal rows 

 there are three or four fine ribs. Immediately posterior to the suture 

 is a fifth row of smaller and more numerous tubercles. Base with 

 spiral stria?. Aperture not well seen. Length (approximative) 

 37 mm., width 11 mm. 



Affinities. — This species is easily distinguished from 0. pustu- 

 losum, Sowerby 2 (Gosau Beds), by its smaller spiral angle and fewer 

 tubercles. C. pustulosum of d'Orbigny 3 (non Sowerby) is near to 

 C. Saundersi, but the sutures are much deeper. 



C. pseudoclathratum, d'Orbigny, 4 differs from this by its greater 

 sutural angle, and by the posterior rows of tubercles being smaller 

 than the anterior. 



Distribution.— Chalk Bock of Cuckhamsley and Hitchin. 



1 ■ Envir. de Paris/ in Cuvier's ' Oss. Foss.' vol. ii. (1822) p. 614, pi. ix. f. 10 ; 

 d'Orbigny, 'Pal. Fran?. Terr. Cret.' vol. ii. (1843) p. 371, pi. ccxxx. f. 12; 

 Pictet and Eoux, < Moll. Foss. d. Gres Verts des Env. de Geneve ' (1849), p. 279, 

 pi. xxvii. f. 7 a-c. 



2 Sowerby, Trans. Geol. Soc. ser. 2, vol. iii. (1835) pi. xxxix. f. 19. See also 

 Zekeli, ' Die Gasterop. d. Gosaugeb.' Abb. der k. k. geol. Eeichsanst. vol. i. 

 (1852) p. 100, pi. xix:f. 4,5. 



3 'Paleont. Fran 9 . Terr. Cret.' vol. ii. (1843) p. 381, pi. ccxxxiii. f. 4. 



4 Geinitz, ' Das Elbtbalgeb. in Sachsen ' (Palaeontograpbica, vol. xx.), pt. ii. 

 (1874) p. 175, pi. xxxi. f. 5. 



