408 CRETACEOUS GASTROPODA 
13. Bulla Orbignyi, Guéranger, Album. pal. 1867, pl. 14, fig. 35, is also probably an Acteonina. 
14. Cylindrites brevis, Gabb (Paleont. Calif., I, p. 115, non zdem Morr. and Lye.) is the only 
cretaceous species described under that generic name, though I do not think that it belongs to the 
genus Cylindrites ; itis more like an Act@on, or it may be an imperfect Cynulia. If the shell has 
no thickened lip and is smooth it must form the type of a new genus. We possess from our South 
Indian cretaceous rocks an imperfect specimen of a shell, which much resembles this supposed 
Cylindrites ; traces of the shell-surface show that the structure was thin, and there are only striz 
of growth perceptible. The termination of the columella is twisted, and above it, nearly at the 
middle of the inner lip, there is a distinct fold; the lip itself not being remarkably thickened. In 
consequence of the imperfectness of the only specimen which is from a brownish, siliceous sandstone 
west of Kurribiem, I am compelled to leave this interesting fossil undetermined, until better materials 
have been procured, 
Bullina, Fér. 
15-16. Bullina (Tornatina) Jaccardi and Urgonensis, Pictet et Camp. (Paléont. Suisse, ITI Ser., 
pp. 176-177). 
17. Butlina tenuistriata, Cotteau, Moll. foss. de ?Yonne, p. 47. 
17a. Conus cylindraceus, Gemitz, appears to be a Bullina, judging from the figure given by 
Reuss in his Bohm. Kreidef., 1846, I, pl. 11, fig. 19. The Volvaria tenuis, Reuss (ibid., p. 50) is 
probably the same or a very closely allied species. Reuss questions the existence of three colum- 
ellar folds. 
18. Bulla Archiaci, Bosq. (Foss. fauna en flora van Limburg, in Staring’s Bodem van Neder- 
land, II deel) is, from specimens received through Mr. Bosquet himself, a true Budlina. 
19-20. Bullina alternata and ecretacea will be described from our South Indian cretaceous 
deposits ; they both have an immersed, but distinct spire. 
Of the genus Acteon, including Solidula or the biplicated forms, 24 species from European 
cretaceous deposits are quoted by Pictet and Campiche (1. cit., pp. 193-195). 
21. Acteon marginata, Desh., sp., is the only known cretaceous species which partially resembles 
the form named by A. Adams Iyonia, but it may be an imperfect Cinulia. 
22. A. marullensis, VOrb. (A. affinis, in Pal. franc.) is a Ringinella with slightly thickened 
outer lip; if specimens are not fully grown the lip is only obtuse. 
23. A. albensis, VOrb., is also a Ringinella with a slightly thickened lip. 
24. A. ringens, VOrb., a species with the aperture anteriorly truncated, the inner lip thick 
with one anterior and three posterior folds ; this probably represents a distinct type of a genus or at 
least of a sub-genus. 
25-26. A. sealaris and brevis, @’Orb., are almost only known by name. 
27. A, Astieriana, VOrb., probably a true Acteon, 
28. . Moutoniana, VOrb., a very short form. 
29. . Lorbesiana, d’Orb., is a true Acteon. 
31. dA. Vibreyana, V@Orb., belongs to the same type as A. ringens. 
32. A. affinis, Sow., is a Ringinella, allied to R. lacryma. 
33. Lornatella elongata, Sow., is probably also a Ringinella. 
34, A. elongata, Coquand, is an elongated species with five folds, probably of the same type 
as A. ringens and Vibreyana of dOrbigny. 
35. 4. ovwm, Dujardin, sp., is most likely a young shell of a Cinulia (as restricted) or an 
Huptycha. 
A 
A 
A 
30. A. subalbensis, Orb. (A. albensis apud Forbes), is doubtful. 
A 
A 
36. A. subsulcatus, VOrb. (Auric. suleata, Dujardin) appears to be only an imperfect specimen 
of an Avellana. 
