﻿214 DEVONIAN FAUNA. 



extending beyond the inner margin of the mouth. Spire increasing with extreme 

 rapidity, consisting of less than a volution, not very convex, and spreading out 

 rapidly to the mouth on every side. Spiral contour of the back only slightly convex. 

 Mouth broadly heart-shaped. Surface indistinct. 



Size. — Height 17 mm., width 19 mm., distance of apex from plane of mouth 

 5 mm. 



Locality. — There is a specimen, probably from Lummaton, in the Torquay 

 Museum, and another from the same locality in my Collection. 



Remarks. — The materials for identifying this species are exceedingly scanty, 

 and it is therefore very difficult to speak with any certainty about it. All that 

 can be said is that it seems so unlike any of the accompanying forms that it must 

 be regarded as most probably distinct. The distinguishing points seem to be its 

 large ovate mouth, its small, advanced, and horizontally straight umbo, and its 

 low flattened contour. Gapulus cordatus differs in having a free and less curved 

 and more central apex ; and G. squamosus, Trenkner ?, in having its apex 

 more advanced and decidedly curved upwards, and in being horizontally more 

 elongated. 



As far as can be judged from our imperfect specimen, it seems to agree with 

 the C. uncinatus of F. A. Romer, 1 at least as interpreted by Giebel, 2 and Kayser, 3 

 except in having no spiral folds upon the body-whorl. 



10. Capulus columbinus, Whidborne sp. PI. XXI, figs. 4, 4a, 4 6, 5, ha. 



1889. Acbocclia columbina, Whidborne. Geol. Mag., dec. 3, vol. vi, p. 30. 



Description. — Shell rather large, depressed, globose. Spire very small, 

 rapidly increasing, closely recurved. Apex minute, facing upwards. Body- 

 whorl subcircular in section, more convex above, probably flat on the inner side, 

 rather produced below ; horizontally very convex, with decreasing curvature. 

 Mouth large. Peristome occasionally sinuous. Surface covered with very nume- 

 rous, fine, distinct, undulating growth-lines, crossed by very indistinct micro- 

 scopical ridges, and sometimes with strong spiral grooves, at which the growth- 

 lines become strongly flounced. 



Size. — Width 32 mm., breadth 19 mm., height 29 mm. 



Localities. — From Wolborough there is a specimen in Mr. Vicary's Collection ; 

 and from Lummaton there are two specimens in my Collection. 



1 1852, P. A. Bomer, ' Beitr.,' pt. 2, p. 101, pi. xv, fig. 15. 



2 1858, Giebel, ' Sil. Faun. IJnterharz.,' p. 20, pi. iii, figs. (16), 19, 20. 



3 1878, Kavser, ' Abhandl. Geol. Specialk. Preuss.,' Baud ii, pt. 4, p. 92, pi. xv, figs. 1—3, 4?, 5. 



