GASTEROPODA. 17 



extremity ; the aperture is oblique, contracted at the base, sometimes slightly channelled, 

 in other instances entire and rounded ; the outer lip is much curved and thin. Young 

 specimens are less subulate, but the apex is delicately pointed, the volutions are more flat- 

 tened and narrow, the sutures being less strongly marked ; the latter two or three volu- 

 tions in adult specimens are more inflated, and they acquire at the base a rudimentary 

 umbilical groove. 



It is nearly allied to Fibula nudiformis, Piette ('Bull, de la Soc. Geol. Fr.,' 1857, 

 pi. C, figs. 4, 5), from the Great Oolite of Rumigny, Eparcy, Poix, But, &c. ; but, judging 

 from the figures of M. Piette, his species has a shorter spire, with less strongly impressed 

 sutures, and the last two volutions are more lengthened and cylindrical. Fibula = 

 Clii'mnitzia phasianoides, which has the spine similarly subulate, has the volutions more 

 flattened, and the sutures much less impressed ; other recognised species are more 

 lengthened, with flattened volutions. 



Geological Position and Localities. Fibula variata has occurred rarely in the Great 

 Oolite of Minchinhampton, and more commonly in the same formation at Kirklington, 

 Oxon., from which place Mr. Whiteaves has kindly forwarded specimens. Examples are 

 deposited in the British Museum, the Woodwardian Museum, Cambridge, in the collection 

 of Mr. Whiteaves, of Oxford, and in that of the author at Scarborough. 



FIBULA EDLIMOIDES, Whiteaves, sp. Tab. XXXI, fig. 5. 

 CUEMXITZIA EULIMOIDES, Whiteaves. MSS., 1859. 



Testa turriculata, elongata, spira apice acuto, anfractibus (circa 12) angmtis, convexis 

 superne vitta cingcnda, suturis valde constrictis, ultimo anfractu rolundo ; aperturd obliqud, 

 basi angusto subsinuato, columella itmbilico rudimento ; labro externo arcuato ; anfractibus 

 costis obliquis obscuris irregularibm. 



Shell turreted, elongated, acute ; spire with about 12 volutions, narrow, convex towards 

 their lower parts, and encircled with a narrow band at their upper borders ; the sutures 

 are deeply impressed ; the last volution moderately large and rounded ; the aperture is 

 lengthened, oblique, narrow, and sinuated at the base ; there is also a rudimentary um- 

 bilical groove ; the outer lip is much arched ; the surface has irregular, oblique, obscure 

 costse, which resemble lines of growth in the latter volutions. 



Compared with Fibula variata, this species is more subulate, with a shorter last volu- 

 tion ; the encircling band upon the upper border of each volution, the oblique costae, and 

 the convexity of the lower part of each volution, are also distinguishing features. Fibula 

 undulosa, Piette, is more nearly allied to it, but the volutions are less narrow and more 

 flattened or destitute of the swelling of the lower portions of the volutions which is a 

 conspicuous feature in F. culimoides. The height of each volution is equal to half of its 

 opposite diameter. 



3 



