252 Annals of tJic South African Museum. 



On the other hand, there is a superficial resemblance to certain Albiau 

 Turrilites, e. g., T. circumtaeniatus, Kossmat,* or T. catenatus 

 (d'0rbiguy),t but not to Cenomaniau species. The suture-line, however, 

 is placed differently in these true Turrilites, and in the writer's 

 opinion the Nostoceratidae cannot be considered to be descendants 

 of the earlier TttrriHtiilae. The grouping- of the uncoiled forms of 

 the Seuoniau may be provisional and more or less unsatisfactory in 

 the present state of our knowledge ; but we must reject Nowak's 

 opinion that the Senonian " Heteroceras " (" Helicoceras " is a strictly 

 Albiau development), can, with the Aptian true Heteroceras, be con- 

 sidered to belong to one branch of uncoiled Parahoplitids. 



Locality. Umfolozi Valley, East of Railway. Coll. Mr. Illingworth. 



GEN. BOSTRYCHOCERAS, Hyatt. 



14. BOSTKYCHOCERAS ? Sp. 11OV. 



1906. Heteroceras sp. Woods : " Cret. Fauna of Pondoland." Ann. 

 S. Afr. Mus., vol. iv, part vii ; No. 12, p. 339, pi. xlii, fig. 5 a, I. 



This form is represented in the collection by several fragments. 

 One of these (No. 5477) about 35 mm. in length, with almost circular 

 cross-section (long and short diameters 12mm. and 1T5 mm. respec- 

 tively) corresponds with the figured example ; another larger fragment 

 of 1(5 mm. diameter and about 40 mm. length (No. 5476), like the 

 impression of a third and still larger example (No. 5477A), appear to 

 have some of the ribs more pronounced than others, so that it would 

 seem as though, at a larger diameter, this form develops costation 

 like that of the Bostryclioceras sp. ind. next described and compared 

 with certain flared Japanese forms. The ribbing of the examples 

 under discussion, however, is of quite a peculiar character. The 

 inner shell, like the cast of the interior, only shows very indistinct 

 costation. The second layer forms a broad and flat septum at the 

 base of each rib and slight concavities in between these septa. The 



s Loc. cit. (1895), p. 141, pi. xviii, figs. 4 and 5. Kossmat renamed Stoliczka's 

 Turrilites lirazoensis, since it does not agree with Eoemer's type, which Kossmat 

 considered to be Lower Senonian. Whether Kossmat's example (p. 142 (46), 

 pi. xx, fig. 4), agrees with the quadrituberctilate Texas species may be doubtful, 

 but Turrilites Irazoensis is a true Cenomanian Turrilites, occiirring in the Upper 

 Denison Beds (Grayson Formation), about 200-300 ft. above the horizon of 

 Sulschloenbachia leonensis, probably of rostrata (s.l.) date. (E. T. Hill, "Geogr. 

 and Geol. Black and Grand Prairies, Texas," ' 21st Ann. Rep. U.S. Geol. S.' 

 (1901), p. 247). 



t ' Pal. Franc., Ter. Cret.,' vol. i, pi. cxl, figs. 1-3. 



| Loc. cit. (1913), p. 379. 



