INOCERAMUS. 293 



Uoimii-s. — This variety, wliicli is uncommon and of small size, is distinguished 

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

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

 the anterior flattened area and of tlie posterior ear. 



Tijpes. — The type, from the zone of Mlcnisfer cor-inKjniitinn of Soutlierani, 

 Lewes, is in the British Museum, No. 47G8 (Plate LI, fig. 5). Tiie specimen 

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

 Heytesbury is also in the British Museum, No. 4o267. 



Distribution. — Zone of Holaster 2)la)ius of Stonelmll siding near Dover, and 

 Swaffham, Norfolk. Zone of Micraster cor-angninum of Southeram. Upper 

 Chalk (probably zone of Holaster idanus), Heytesliury. 



Jnoceijamls ixcoxsTANs (;((/'. sAiJLMKXsis, cur. nor. Plate LIL tio-s. 2, o. 



A variety found in tlie zone of Actinorama.r (juiolratus of East llarnham 

 (Salisbury), Mottisfont, and "West Meon (Hampshire), is distinguished bv tlie 

 uml)ones being more prominent and not terminal, by tlie regular convexity and 

 equal size of the valves, the absence of tlie 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 earh' part of 

 the shell is less convex and possesses di-stinct folds, but the nmbones are not quite 

 terminal and tlie anterior flattened area is not present. J. inconstans var. 

 narumensls appears to resendile T. Brancoi, "Wegner," of which good figures have 

 not yet been luiblished. 



Lnoceramds liAi/ricus, lidhm, 1907. Text-figs. -jI — ')■}. 



183(5. Inoceramus Cripsii, A. C^''</<(/'«^•(?. Petref. Gt-rm., vol. ii, \i. 116, pi. cxii, 



fig. 46. (Nou I. Crippsi, Mantell, 1822). 



1870. — — var. SULCATA, i''. i?.i;»f)-. Geol. v. Oberschles., p. 35<). 



p!. .\xxi.\, fig. 9. 



1907. — BALTicus, /. Bi'ihm. Zfitsclir. il. deutscli. geol. Gesellscli., 



vol. lix, Mouatsber., p. 113. 



1909. — — /?.;/(<*(. Sublu'ivvn. Kroidfiiiul.le (Alihan.ll. .1. k. 



]ir«.'Uss. geol. Laiulesaust ; n.f. 5G), p. 47, 

 pi. xi, fig. 2a, pi. xii, fig. 1<(. 



1910. — - .1. Noii-iih. J{iill. Intemat. Acad. Soi. Cracovie 



(1909), p. 875. 



' ' Zt'itsclir. d. deutsch. geol. Gesellsch.,' vol. Ivii (1905), p. 159, fig. 4. 



39 



