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parallel to the outlines of the apertures, but these -last not infre- 

 quently have shallow, broad constrictions and slightly projecting or 

 trumpet-like lips in full-grown whorls. 



The specimens of T. ammonuis from the same locality may vary 

 from very broad-whorled forms to those with much narrower almost 

 cylindrical whorls, the former being slightly deeper umbilici and 

 the latter being shallower, as in T. circularise The venter and 

 sides are, however, almost invariably projecting and rounded, 

 unless angulated by compression, whereas in circularis there is a 

 distinct tendency towards truncation or flattening of the abdomen 

 and sides. 



The sutures in the ephebic stage may be nearly straight, but there 

 are in most specimens broad ventral lobes, saddles at the abdomi- 

 nal angles, lateral lobes and saddles on the umbilical zones and 

 lobes in the contact furrow. These inflections are, however, always 

 slight, and the sutures give the impression of being almost straight 

 in most specimens. 



The contact furrow is distinct but not deep in the ephebic stage 

 and continues to be present in the aperture of the whorl, which is 

 never free. 



Trocholites incongruus, Aug. et Lindst. 



Clym. incongrua, Eichw. {Leth Rossica., PI. 1, Fig. 7). 



Clym. incongrua, Schroder (^Ceph. d. Untersil., Pal. Abh., Dames 



et Kayser, v, heft 4, PL ii, Fig. 2-4). 

 Trocholites incongruus, Ang. et Lindst. (Fragm. Sil., PL ix, 



Figs. 15-18). 



This species is beautifully figured byAngelin and Lindstrom and 

 the living chamber and the lines of growth and sutures fully given. 

 It is obviously a smaller species than T. ammonias, with deeper um- 

 bilical whorls much broader proportionately, abdomen very broad, 

 but sides rounded as shown by Schroder. 



Trocholites hospes. 



Paleonautilus hospes, Remele {Zeitsch. deutsch. geol. Gesell., 



xxxiii, 1881, PL ii, Fig. 1). 

 Troch. hospes, Schroder (Ceph. d. UntersiL, Pal. Abh., Dames 



et Kayser, v, heft 4, PL i, Figs. 8, 9). 

 This species, supposed by Remele to be distinct generically from 

 Trocholites, is merely, as shown by Schroder, a species of Trocho- 



