KONGL. SV. VKT. AKADEMIENS UANDL. liANI). 19. N:0 6. 138 



Only two spucimeiis have heoii I'ouiid, one from tlie cririoidtil limestone of Stor 

 Wede in Follingbo and the other variety from a limestone ridge near the ehurch 

 of Burs. 



12. MurcMsonia imbricata n. 



PI. XIII fig. 7—12. 



Shell turriculate, elongate and slender, fig. 7, or short and terete, fig. 8; whorls 

 nine, broader than high. The slit band is prominent as a sharp edge, nearly on the 

 middle of all whorls or a little above. It is narrow, the erescents are long, protracted 

 and tube shaped, slender at their origin beneath the next preceding and slowly widening 

 till they form an erect, somewhat reflexed edge, fig. 11, 12. This form of the cre- 

 scents very much reminds of that in Pleurotomaria tubulosa, pi. IX f. 8, though the 

 crescents are more narrow and elongate in Murchisonia imbricata. The same sort of slit 

 band also distinguishes this species from the two nearly related, preceding ones. In 

 the two varieties, lig. 7, 8, the ornamentation of the surface is thus far dissimilar, that 

 it is finer in the elongated form, than in the other. Thei-e are in both transverse, 

 oblique stria;, somewhat elevated and lamellar at their edges and thence causing an 

 imbricated appearance. They are crossed by a low and narrow ridge above the slit 

 band on the body whorl and by a more prominent, sharp ridge on all whorls near 

 the suture, which is very deep. On the umbilical side the stria) are finer and closer. 

 The aperture is nearly circular and its columellar lip reflexed, though not so much as 

 to hide the narrow umbilicus. H. 5 millim. br. 2 mill. 



This little, beautiful shell occurs plentifully in the marly seams of the upper 

 limestone of Lotsbacken in Slite and a few specimens have also been found in the 

 limestone near Kalens Qvarn and both in the red and gray limestone of Sandarfve kulle. 



13. Murchisonia cancellata u. 



PI. XIII lig. 1. 



Shell turriculate, with eight transverse whorls of greater breadth than height, an- 

 gulated on the middle, where the slit band is situated. This baud is enclosed within 

 two longitudinal, sharply projecting lines on each side and these again have between 

 them a narrow concave belt, streaked with short, oblique lines. The slit band i)roper 

 is thus very narrow, concave, the crescents of so small a size as not to be distingui- 

 shable. The other shell surface is cancellated by transverse and longitudinal threads of 

 equal size, though somewhat unequally distuntiated. The aperture is nearly ovate, the 

 umbilicus is larger than in the others. Height of the most complete specimen 8 mill., 

 br. 4 mill. 



Some specimens have been found in the red limestone of Sandarfve kulle. From 

 this locality there is also a variety with more ventricose whorls, which seems to have 

 been larger. 



