80 a. LINDSTKOM, ON TIlK SlLUIilAN GASTKoTODA AND ITKUOrODA OF OOTI.AND. 



11. Bellerophon gemma n. 



PI. XIX fig. 12-14. 



Shell iijlohulai-, last whorl rather rai)idly expanding, in section broadly transverse 

 or elliptical, inclining to crescent shape. The umbilicus is narrow and open. The 

 ornatnentation, which cannot be plainly seen without a strong lens, consists of a large 

 slit band, covered by the same sort of densely crowded lines which decorate the sides 

 and join the slit band in an angle of (58°. They are longitudinally streaked with 

 elevated wrinkles, larger towards the opening and attenuated backwards. H. 5 mm., 

 breadth at the a])erture 6 mm. Only a single specimen has hitherto been found in tlie 

 shales of Wisby. Another specimen in good preservation from the red limestone of 

 Sandarfve kulle comes near to the preceding, but differs in the slit band not being 

 elevated, only at the same level with the other surfa(;e, and also in the ornamental 

 lines being more arched. 



12. Bellerophon pilula n. 



PI. VI figs. 29—30. 



Shell globular, aperture, as far as preserved, transverse, crescent shaped, more than 

 four times as broad as high. Umbilicus open. Surface covered by a hue network of 

 minute, elevated, longitudinal and transverse lines, which enclose regular, quadratic 

 spaces. The slit band indistinct. Height 3 millim., breadth 2 millim. 



Found ill the oldest shale at Djupvik in Eksta. 



13. Bellerophon trilobatus Sowerby p. p. 



PL IV iigs. 13—15. 



IJcllfrophoti trilo/iatiis. 1S39. SowKUBV in Sil. Syst., 60-1. j)!. 3 lig. 1(1. 



1840. D'OnHiONY II. Nat. Coplialop., iO!), pi. 7 lig. 24—27. Pi. 8 figs. 13 is also 

 cited, but in the eopy of the work, to which I iiavo had access tiicrc is no 

 |)l:itc 8. Perhaps it has never heen piililislied. 

 1850. D'OiUi. Prodr. I, 31. 



1854. Moiuiis Cat. Brit. Foss., 288. 



1855. Mac Ooy Brit. Pal. Foss., 311. 



1856. Sanuberger, Verstein. des Rhein. Scliiehtcnsyst., 177. pi. 22 I'., 1 — 3. 

 1867. Salter Silnria 3d Ed , 534, pi. 34 f. 9. 



1873. Id. Catal. Cambr. Mnseuni, 97, 192. 



Shell involute, with three or four broadly and tran.sversally flattened whorls, 

 which are elliptical in section, and their height contained nearly three times in 

 their breadtli. Tlie dorsal surface is divided in three different longitudinal (iclds 

 through two deep grooves near the sides. Tlie median field is at least of doubh^ the 

 size of the lateral ones. As the specimens exist only in ca.sts, there are no vestiges 

 of the shell itself and it is even doubtful whether it really belongs to this genus as 



