﻿CIRRUS. 



307 



and ornamented with about five rows of granulated spirals, more or less decussated 

 by axial lines, thus producing a structure partly granular and partly reticulate. 



Body-whorl subventricose with a rounded base, produced anteriorly, and orna- 

 mented by close and finely granulated spirals ; the narrow umbilicus has a dis- 

 tinct row of granules encircling its edge; aperture round. 



Relations and Distribution. — We may regard Cirrus Etheridgii as a somewhat 

 aberrant form of the Leachi-growp. It is, as far as I know, peculiar to the 

 Cotteswolds. The only two specimens to which I have had access are said to 

 come from the Gryphite-grit of Rodborough Hill, which is about the horizon of 

 the concavb '.v-zone at Bradford Abbas. 



241. Cirrus, species or variety. Plate XXIV, fig. 16. 



Attention may here be drawn to a very fine specimen of Cirrus belonging to 

 Mr. Monk, which comes from Stoford or Bradford Abbas. It is not unlike 

 C. Etheridgii just described, except in being a little broader and more ventricose, 

 and in having the system of ornamentation more espaced and reticulate. The 

 umbilicus also is larger. This form also is a member of the Leach i- group, though 

 it differs in several important characters from that demoid species. 



So fine a specimen as the one figured is unique ; but here and there in the 

 North-Dorset beds one finds fossils which are difficult to refer to Cirrus Leachi t 

 and which have a certain resemblance to this one. These I distinguish tempo- 

 rarily as Cirrus " reticulata. The fossil noticed by Mr. J. Buckman (' Proc. 

 Dorset N. H. Club,' p. 139, pi., fig. 5) as Cirrus pyramidalis, Tawney, an 

 altogether erroneous identification, bears some resemblance to the forms I call 

 Cirrus " reticulatus." 



242. Cirrus gradatus, sp. nov. Plate XXIV, fig. 17. 



But cf. as possibly an immature specimen — 

 Cieeus iNTEEMEDius, J. Buckman. Proc. Dorset N. H. Field Club, p. 13S, 



pi., fig- 1. 



Description 



Length . . . . .48 mm. 



Height of body-whorl to total length . . 35 : 100. 



Spiral angle .... 46°. 



Shell sinistral, conical, turrited, deeply umbilicated. Spire acute ; spiral 

 angle moderately concave. The extreme apical conditions are unknown. Xum- 



