84 MR. H. WOODS ON THE MOLLUSCA [Feb. 1 896,. 



Genus Cbiocekas, Leveille, 1836. 

 Ceioceeas elliptictjm (Mantell), 1822. (PI. III. tigs. 8-10.) 



1822. Samites elUpticus, G. A. Mantell, ' Foss. S. Downs/ p. 122, pi. xxiii. f. 9 ;; 

 1840. H. B. Geinitz, ' Charakt. d. Schichten u. Petrefacten d. sachsischen Kreidegeb.' 

 Heft 2, p. 41 ; 1841. F. A. Bonier, ' Verstein. d. norddeutsch. Kreidegeb.' p. 93,. 

 pi. xiv. f. 5 ; 1843. H. B. Geinitz, ' Die Verstein. von Kieslingswalda,' p. 9, pi. i. f. 7; 

 1846. H. B. Geinitz, ' Grnndr. der Verstein.' p. 304; 1852. C. G. Giebel, ' Fauna der 

 Vorwelt,' vol. iii. p. 302 ; 1854. ? J. Morris, ' Cat. Brit. Foss.' 2nd ed. p. 305. 



1822. Samites alternatus, G. A. Mantell, ' Foss. S. Downs,' p. 122, pi. xxiii. f. 10, 11;. 

 1840. H. B. Geinitz, ' Cbarakt. d. Scbicbten u. Petrefacten d. sachsischen Kreidegeb.' 

 Heft 2, p. 41 ; 1841. F. A. Bomer, ' Verstein. d. norddeutscb. Kreidegeb.' p. 93. 



1842. Samites alternans, H. B. Geinitz, ' Charakt. d. Scbicbten u. Petref. d, 

 sachsischen-bohm. Kreidegeb.' Heft 3, p. 68, pi. xvii. f. 36 ; 1861. F. J. Pictet and 

 J. Campiche, 'Foss. des Terr. Cret. de Ste.-Croix,' Pal. Suisse, ser. 3, pt. ii. p. 93. 



1850. Samites angustus, J. de C. Sowerby, in F. Dixon's ' Geology of Sussex,' 

 p. 346 (p. 385 of 2nd ed. 1878), pi. xxix. f. 12; 1876. C. Barrois, 'Becherches sur le 

 Terr. Cret. Sup. de l'Angleterre et de l'lrlande,' p. 29 (footnote 4). 



1850. Ancyloceras ellvpticus, A. d'Orbigny, ' Prodr. de Paleont.' vol. ii. p. 147 ; 

 1861. F. J. Pictet and G. Campiche, ' Foss. du Terr. Cret. de Ste.-Croix,' Pal. 

 Suisse, ser. 3, pt. ii. p. 41. 



1850. Samites Geinitzii, A. d'Orbignj r , ' Prodr. de Paleont.' vol. ii. p. 215 ; 1872. 

 ? A. Fritscb and U. Schlonbach, ' Cepb. bohm. Kreidefonnat.' p. 46, pi. xvi. f. 16. 



1852. Samites armatus, C. G. Giebel, ' Fauna der Vorwelt,' vol. iii. p. 297 (partim) ; 

 1854. var., J. Morris, ' Cat. Brit. Foss.' ed. 2, p. 305. 



1861. Anisoceras alternatus, F. J. Pictet and G. Campiche, 'Foss. des Ten-. Cret. 

 de Ste.-Croix,' Pal. Suisse, ser. 3, pt. ii. p. 71, pi. Ii. 



1872. Crioceras ellijoticum, C. Schluter, 'Ceph. oberen deutsch. Kreide,' p. 100, 

 pi. xxx. f. 11, 12, pi. xliii. f. 1, 2. 



1872. ?? Samites cf. angustus, C. Schluter, ibid. p. 106, pi. xxxii. f. 6, 7. 



1874. Samites ellijpticum, H. B. Geinitz, l Das Elbthalgebirge in Sachsen ' (Palae- 

 ontographica, vol. xx.), pt. ii. p. 194, pi. xxxv. f. 13-15, ? 16. 



Description. — Shell elliptical in section, ornamented with strong 

 ribs, which become less prominent on the inner margin, and are 

 slightly fiexuous in the older specimens. Each rib bears a pair of 

 tubercles, one on each side of the siphonal line; the pairs are 

 alternately large and small, but the relative size varies in different 

 specimens, in some the two sets are of nearly equal size, in others 

 one set is very much smaller ; occasionally the alternation in size is 

 somewhat irregular. 



Suture-line : siphonal lobe small, superior-lateral lobe deep, bifid r 

 not quite symmetrical, inferior-lateral lobe similar to the last, but 

 not so deep, internal lobe smaller, not quite symmetrical ; saddles 

 much broader than the lobes, siphonal saddle bipartite, larger than 

 the superior-lateral saddle, inferior-lateral saddle of about the same 

 width but not so deep as the superior-lateral. 



Remarks. — The type of Mantell's Hamites ellipticus (fig. 9) is in 

 the British Museum, but that of Hamites alternatus cannot be 

 traced. Both of Mantell's specimens came from the Chalk Marl of 

 Middleham. 



Distribution. — England : Lower and Middle Chalk. Chalk Rock 

 of Winchester, Cuckhamsley, Luton cutting, Hit chin, and Under- 

 wood Hall near Hullingham. France : zone of Terebratulina gracilis 

 east of the Paris basin. North-western Germany : confined to the 

 zone of Het. JReussianum, found at Heiningen, Windmiihlebergen 

 near Salzgitter, Neue Wallmoden, etc. Saxony : Planer-Kalk of 

 Strehlen and Weinbohla. 



