ACT^ONINA. 477 



426. AcTiEONiNA ANTiQUA, Lijceft, 1857. Plate XLIII, fig. 6. 



1859. AcTiEONiNA ANTiQTJA, Lycett. Cotteswold Hills, p. 125, pi. iv, fig. 9.^ 



Description. — The height of the figured specimen is 38 mm. Shell oblong, thin, 

 with an obtuse apex and short spire of about four or five volutions ; the spire is from 

 one sixth to one seventh of the total height ; whorls rounded upon their upper 

 borders. Aperture elongate, narrow above and expanded anteriorly ; columella 

 curved and emarginated at its base. 



The above is a slight modification of Ljcett's original diagnosis. 



Relations and Distribution. — The proportions bear some resemblance to those 

 of Actaeonina glabra, though in this case the spire is shorter and the figure of the 

 body- whorl is somewhat different. The type is from the Sjjinosa-stage of Rod- 

 borough Hill, and is the only specimen of that size which has come under my notice. 

 Smaller specimens, when compared with Actseonina glabra, exhibit a shorter spire 

 than that si3ecies. 



427. AcTiEONiNA (?) coNVOLUTA, Ljjcett, 1857. Plate XLIII, fig. 7. 



1857. AcT^ONiNA coNVOLUTA, Lycett. Cotteswold Hills, p. 125, pi. iv, fig. 8. 



Description. — The height of the figured specimen is 35 mm. " Shell oblong, 

 rather compressed at the sides ; spire depressed, scarcely produced, consisting of 

 five volutions, which embrace each other and rise but little above the body- whorl; 

 apex obtuse ; aperture lengthened, very narrow above, more expanded towards 

 the base; columella curved at the base, emarginated and slightly twisted." 



Relations and Distribution. — ^The tendency of Actseonina in the direction of the 

 Bullidge seems to reach a maximum in this curious form. As pointed out by 

 Lycett, it differs from Bulla primseva, Deslongchamps, in its more cylindrical 

 figure and in the fact that the spire is slightly prominent, and not sunk in an 

 apical cavity. 



The type is from the SjAnosa-stage of Rodborough Hill. I have a character- 

 istic specimen from the Cli/peus-grit of Aston Farm, and a smaller one from the 

 Rag of Cleeve Hill, all in the Parhinsoni-zone. In these specimens the outer lip is 

 straighter than in the figured specimen, which in this respect is rather mis- 

 leadinsf. 



O" 



1 Tu Lycett's plate the numbers referring to Actieonina antiqua and Act. convoluta have been 

 transposed. 



63 



