INOCERAMUS. 293 



Reworks. — This variety, which is uncommon and of small size, is distinguished 

 by the strongly inflated valves, the large angle between the hinge-line and the 

 anterior border, the absence of folds, and the absence or indistinct character of 

 the anterior flattened area and of the posterior ear. 



Types. — The type, from the zone of Micraster cor-anguinum of Sontheram, 

 Lewes, is in the British Museum, No. 4768 (Plate LI, fig. 5). The specimen 

 figured by Sowerby from the Upper Chalk (probably zone of Holaster planus) of 

 Heytesbury is also in the British Museum, No. 43267. 



Distribution. — Zone of Holaster planus of Stonehall siding near Dover, and 

 Swaffham, Norfolk. Zone of Micraster cor-anguinum of Sontheram. Upper 

 Chalk (probably zone of Holaster planus), Heytesbury. 



Inoceramus jnconstans var. sarumknsis, var. nov. Plate LII, figs. 2, 3. 



A variety found in the zone of Actinocama.r, quadratus of East Harnham 

 (Salisbury), Mottisfont, and West Meon (Hampshire), is distinguished by the 

 umbones being more prominent and not terminal, by the regular convexity and 

 equal size of the valves, the absence of the anterior flattened area, and the absence 

 or indistinct character of the concentric folds. This variety is connected with 

 typical forms of the species by some examples (Fig. 49) in which the early part of 

 the shell is less convex and possesses distinct folds, but the umbones are not quite 

 terminal and the anterior flattened area is not present. 1. inconstans var. 

 sarumensis appears to resemble /. Brancoi, AVegner, 1 of which good figures have 

 not yet been published. 



Inocekamus balticus, 1'ohm, 1907. Text-figs. 51 — 53. 



1886. Inoceeamus Cripsii, A. Golclfuss. Petref. Germ., vol. ii, p. 116, pi. cxii, 



fig. 4b. (Non J. Crippsi, Maiitell, 1822). 



1870. — var. sulcata, F. Homer. Geol. v. Oberschles., p. 356, 



pi. xxxix, fig. 9. 



1907. — balticus, J. B'olim. Zeitschr. d. deutsch. geol. Gesellsch., 



vol. lix, Monatsber., p. 113. 



1909. — — Bokm. Subhercvii. Kreidemukle (Abliandl. d. k. 



preuss. geol. Landesanst ; n.p. 56), p. 47, 

 pi. xi, fig. 2a, pi. xii, fig. la. 



1910. — — /. Nowak. Bull. Internal:. Acad. Sci. Cracovie 



(1909), p. 875. 



1 ' Zeitschr. d. deutsch. geol. Gesellsch.,' vol. lvii (1905), p. 159, fig. 4. 



39 



