256 Annals of the South African Museum. 



GEN. DIPLOMOCERAS, Hyatt. 



16. DIPLOMOCERAS ? iNDicuM, Forbes sp. 

 (PI. XXIII, fig. 5.) 



1895. Him/Hi'* (Aitifiorrras') mcZictts, Forbes. Kossmat. Siidind. Kreidef . 



Beitr. 'L. Pal. mid Geol. Ost.-Ung. etc., vol. ix, p. 145, pi. xix, 



lig. 4. 

 l',i)6. linn/Hi'* (Anisoceras) indicus,Woo<\s. Cret. Fauna of Pondoland, 



p. 340, pi. xliv, fig. -2. 



This form is represented in the collection by a fragment (No. 5465) 

 that corresponds with Kossmat's fig. 4a ; but the hooked portion 

 forms the smaller end, not the larger, as in Kossmat's figured example. 

 The last few suture-lines, shown on the hooked portion of the shell, 

 arc of the general outline of that of D. f indicum as figured by Kossmat, 

 but have a less minutely frilled edge. The costation is closer than 

 it is in the fragment figured by AVoods, but not so close as in Kossmat's 

 specimen or in D. ? rugatum (Forbes), Kossmat sp., the cross-section of 

 which latter species, also, is more elliptical. The costation is very 

 sharp and not septate, i. e. the ribs are as acute on the cast as they are on 

 the shell. One of the ribs is higher than the others (about 1'5 mm. 

 high, measured from the concavity at each side, at a whorl-diameter 

 of 9 mm.). Specimens of D. f large-sulcatum, Forbes sp., and D. f ruga- 

 turn, Forbes sp., in the British Museum show similar irregularities, as 

 does the Japanese form, figured as " Hamites sp.," by Jimbo* and 

 compared with D. ? large-sulcatum by Kossmat. f The costation is too 

 distant, however, in the latter species, as it is in the small fragment 

 of a " Hamites " from Umkwelane Hill figured by Etheridge.+ This 

 was compared with Griesbach's Atiisoceras ruyatum, Forbes sp., from 

 the Umtamvuua Beds (a form that was included by Woods in the 

 synonymy of D. 'f indicuin), but probably is nearer to D. / large-sulcatum, 

 Forbes sp. 



Such species as D. obstrictum Jimbo sp., and D. ellvpticum, 

 Anderson sp.,|| seem to form a connection with the typical gigantic 

 Dtplomoceras of the cylindricum and notabile group, but with increased 

 knowledge of these forms it will probably be necessary to separate 

 from the highly specialised Diplomoceras the Indian " Anisoceras" 



* Loc. cit. (1894), p. 40, pi. vii, fig. 7. 



t Loc. cit. (1895), p. 147. 



I Loc. cit. (Second Beport, 1904), p. 90, pi. iii, fig. 23. 



5 In Whiteaves, loc. cit., p. 334, pi. xliv, fig. 3. 



|| Loc. cit., 1902, p. 87, pi. iii, figs. 102-3. 



