KONGL SV. VET. AKADEMIENS IIANDL. BAND. 19. N:0 6. 97 



A dozen specimens have been found in the red limestone of Saridarfve kulle 

 and a few also in Linde klint. Throiigh its ornamentation and its slit band it is nearcst 

 allied to Pl. oradata from the satne localities. 



4. Pleurotomaria voluta n. 



Pl. XIX (ig. 25—29. 



Shell discoid, tumid, with slightly prominent spire. Whoi'ls eight, of regular 

 increase. The shell is on both the apical and umbilical side decorated with sharp, 

 sigmoid transverse lines curved towards the aperture near the suture and backvvards 

 near the slit band. They are crossed by finer, longitudinal lines, forraing minute tn- 

 bercles where they meet. The section of the whorls is nearly ovate, high, arched 

 above, flattened below. The belt of the slit band is situated much beneath the raiddle 

 line of the body Avhorl and divides the flattened surface of the shell from the more 

 tumid. It is relatively large and is crossed by some longitudinal lines. The slit band 

 itself cannot be discerned through the bad preservation of exactly this part. 



Through its general form and as far as can be judged in the conformation of 

 the zone of the slit band this species comes near to the preceding, from which it, 

 however, is sufficiently, distinct by its greater tumidity, its ornamentation and wider 

 umbilicus. Height 4 raill., br. 11 raill., diameter of umbilicus 6 niill. 



Two specimens have been found in the red and gray limestone beds of Sand- 

 arfve kulle. 



5. Pleurotomaria claustrata n. 



Pl. VII f. 31— .36. 



Shell conical, trochoid, whorls seven or eight, gently convex, forraing an acute 

 angle at the oblique slit band, which is placed sornewhat above the median line of the 

 whorls. Its surface is almost flat, sloping inward, towards the columellar axis of the 

 shell, larger than in any other species of its group, bordered by two outstanding la- 

 meliar edges, as seen in sections, fig. 32 and .36. The crescents are large, distantiated 

 and intersected by at least ten longitudinal lines. On the surface of the shell there 

 are fine, transverse, backwards directed strife, with interstices nearly five times as large 

 as them, and partitioned off by small strife, distantiated, parallel with the slit band, 

 causing a likeness with a ladder, as they are enclosed within their interstices and not 

 connected with each other in continuous longitudinal lines. If seen with a lens they, 

 at least in some parts of the shell, continue uninterrupted över the transverse lines, 

 fig. 35. The aperture is transverse, the columellar lip reflexed around the narrow, 

 but open and funnel shaped umbilicus. 



Height 15 millim., br. 18 raillim. Apical angle 85°. Specimens have been found 

 at Likkershamn, Samsugn, Follingbo, Kyrkbei'get in Wisby and Snäckgärdet near that town. 



K. Vot. Akad. Ilanill. Rand 13. N:o <i. 13 



