82 me. m woods on the mollusca [Feb. 1 896, 



1861. F. J. Pictet and G. Campiche, 'Descript. des Foss. du Terr. Cret. des Envir. 

 de Sainte-Croix,' Paleont. Suisse, ser. 3, pt. ii. p. 21; 1865. F. A. Homer, 'Die 

 Quadraten-Kreide des Submerberges bei Goslar,' Palaeontographica, vol. xiii. p. 198 ; 

 1866. C. Schliiter, Zeitscbr. d. deutsch. geol. Gesellsch. vol. xviii. p. 73 ; 1868. C. G. 

 Giimbel, ' Geogn. Bescbreib. des Konigreichs Baj^ern,' vol. ii. p. 764 ; 1870. F. Romer, 

 'Geol. von Oberschlesien,' p. 320, pi. xxxv. f. 6; 1872. C. Scbbiter, ' Ceph. d. 

 ober. deutscb. Kreide,' p. 75, pi. xxiii. f. 12-22, pi. xxvii. f. 9 ; 1872. A. Fritsch 

 and U. Schlonbach, ' Ceph. bohm. Kreideformat.' p. 42, pi. xiii. f. 7, 8, 10, 12, pi. xiv. 

 f. 11 ; 1874. H. B. Geinitz, ' Das Elbtbalgebirge in Sacbsen ' (Palaeontographica, 

 vol. xx.), part ii. p. 191, pi. xxxv. f. 1-4 ; 1877. A. Fritsch, ' Stud, im Gebiete der 

 bohm. Kreideformat. II. Die Weissenberger und Malnitzer Schichten,' p. 102 ; 1883. 

 Fritsch, ibid. ' III. Die Iserschichten,' p. 92, f. 53 ; 1889. Fritsch, ibid. ' IV. Die 

 Teplitzer Schichten,' p. 71, f. 43; 1893. Fritsch, ibid. 'V. Die Priesener Schichten,' 

 p.76 ; 1895. J. J. Jahn, Jahrb. der k. k. geol. Reichsanst. vol. xlv. p. 133, pi. viii. f. 3. 



1855. Ammonites wiltonensis, D. Sharpe, ' Foss. Moll, in the Chalk of England,' 

 (Ceph.) pt. i. p. 53, pi. xxiii. f. 10 a-c. 



1865. Scaphites striatus, F. A. Romer, 'Die Quadraten-Kreide des Submerberges 

 bei Goslar,' Palaeontographica, vol. xiii. p. 198. 



1868. Scaphites Cottai, C. G. Giimbel, 'Geogn. Beschreib. des Konigreichs 

 Bayern,' vol. ii. p. 764. 



Description. — Shell flattened, or sometimes rather convex; 

 siphonal margin rounded. The greatest width is attained in the 

 straight part of the shell, midway between the involute part and 

 the recurved portion ; the inner margin of this part is nearly 

 straight, the siphonal margin is regularly convex. The surface of 

 the shell is ornamented with numerous ribs which are continuous 

 across the siphonal margin ; the number and proximity of these 

 vary somewhat in different specimens. On the involute portion 

 of the shell there are between two and three times as many on the 

 siphonal area as on the lateral area ; this is due partly to the fact 

 that the ribs in many cases bifurcate before the siphonal area is 

 reached, and partly to the intercalation of new ribs. On the 

 lateral area of the e volute part, and slightly nearer the siphonal 

 than the internal margin, is a row of from seven to nine rather 

 blunt tubercles, which commences at about the middle of the 

 straight part and ends before the aperture is reached. Each 

 tubercle gives rise on the inner side to a single rib, and on the 

 siphonal side to a pair of ribs, and between these pairs one, or some- 

 times more, ribs are intercalated. Between the last tubercle and 

 the aperture of the shell, the ribs originate from the inner margin 

 of the whorl, sometimes bifurcating, sometimes remaining single. 

 In a few specimens the row of tubercles is rather indistinct. 



In one small specimen the aperture of the shell has a projecting 

 lip. The body-chamber commences where the shell becomes evolute. 

 Suture-line: saddles much broader than the lobes. Siphonal 

 lobe large and deep, about twice the size of the superior-lateral 

 lobe, which is bifid, inferior-lateral lobe small, trifurcate. Siphonal 

 saddle broad, bipartite, the outer division larger than the inner. 

 Superior-lateral saddle about half the size of the siphonal saddle, 

 bipartite and not quite symmetrical. Inferior-lateral saddle smaller, 

 slightly bifid. 



Remarks. — The largest example that I have seen has a length of 

 45 mm. There are two forms of this species, a thick and a thin 

 one, and these can be distinguished in individuals of all sizes ; it is 

 possible that the difference may be due to sex. 



This form was first described by Geinitz, who, however, referred 



