02 ORDOVICIAN AND SILURIAN BKLLEROPHONTAOEA. 



unusually low transverse whorls, the width being four or five times the height, 

 which is very small. The dorsum is broadly rounded and there is no trace of 

 angulation. Unfortunately the shell itself is not preserved, but in B. latevittatus, 

 Lindstr., 1 and B. pilula, Lindstr., 2 it is stated to possess revolving as well as 

 transverse strias. In shape and external characters, so far as preserved, our shell 

 may be compared with these species. Lindstrom (op. cit , p. 74), on the strength 

 of the ornamentation, refers these Swedish shells to the genus Bn.ca.nia of Waagen 

 and De Koninck, but Ulrich and Scofield 3 refer B. latevittatus to the genus 

 Bucaniopsis. 



Dimensions: i n 



Height of shell .... 20 mm. . 23 mm. 



Width of shell at umbilicus . 1<> ,, . 18 ,, 



Horizon. — Wenlock Limestone. 



Locality. — Dudley. 



5. Bucaniopsis ? sp. 



Specific Characters. — -Shell of few whorls, outer whorl very rapidly expanding 

 in size, especially in width ; dorsum broadly rounded ; umbilicus deep, open ; 

 umbilical edge subangular, umbilical slope steep. Whorls transverse, wider than 

 high. Mouth very large and broad, transversely subcordate, with lateral and 

 lower lips suddenly expanded at right angles to plane of spiral ; lower lip 

 impressed by early part of outer whorl but descending below it and somewhat 

 reflexed; outer lip not reflexed, with large open V-shaped sinus and rounded 

 apertural lobes. 



Dimensions. — Height of mouth including lips, c. 32 mm.; width of mouth 

 including lips, c. 50 nun.; height of shell without lips, c. 17 mm. ; width of 

 distal end of outer whorl, c. 15 nun. ; height of distal end of outer whorl, c. 9 mm. 



Horizon. — Llandovery Beds D. 



Locality. — The Frolic, Haverfordwest. 



Remarks. — There is one fair internal east and one imperfect apertural view 

 of another specimen in the Sedgwick Museum referable to a species which is 

 undoubtedly distinct from other British forms. It is not possible to make out the 

 characters of the surface or slit, but the broadly expanded mouth, the rapidly 

 increasing size of the outer whorl and the deep open umbilicus with subangular 

 edges resemble It. mohri, Miller, 1 from the Richmond Beds of Indiana and 



1 Lindstrom, op. cit., p. 79, pi. vi, figs. 26 — 28. 



2 Ibid , p. 80, pi. vi, figs. 29, 30. 



3 Ulrich and Scofield, op. cit., p. 853. 



1 Miller, ' Cincinnati Quart. Journ. Sri.,' vol. i (1874), p. 306, fig. 30 ; Ulrich and Scofield. op. cit., 

 p. 920, pi. lxiv, figs. 44, 45. 



