128 G. LINDSTRÖM, ON THE SILURIAN GASTKOPODA AND PTEUOPODA OF GOTLAND. 



Height 63 mill., width of body whorl 28 mill., width of smallest whorl 7 mill. 

 Height of aperture 19 mill., width of the same 15 mill. Apical angle 36°. 



The original specimen of Hisinger, now iigured anew, pl. XII f. 9, has been 

 found by him in a detached stone near the church of Gothem. The rock is a 

 variety of oolite, peculiar to a quarry at the base of Bara backe and consequently 

 there cannot be any doubt of its being derived from that place. Quite similar 

 spccimens have been found in the gritty limestone near Gothems hammar. Those 

 from neighbouring quarries in Hörsne are also nearly allied, though there is some little 

 difiference as to the relative size of the whorls. 



Fragments of a fine specimen have been obtained from the canal near Westöös 

 in Hall. Nuclei which in all probability belong to this species to judge from their 

 shape, have been found in the härd shale of Petesvik in Habblingbo. They are larger 

 than those from Gothem measuring as much as 35 mill. in width of the body whorl. 

 The Museum of Copenhagen has specimens from Näs. 



2. Murcliisonia cava n. 



Pl. XII fig. 4. 



Shell cylindrical, turreted, whorls, only six left in the fragraentary specimens, 

 ventricose, rather angular near the slit band. This is narrow, situated exactly on the 

 middle of the body whorl and near the upper suture in the other whorls, more deeply 

 excavated than in any other species of its group, the crescents oblique, distantiated. 

 Aperture ovate. Dimensions of specimen from Djupvik in Eksta: h. 51 mm., br. 28 mm. 

 Specimens have been obtained, from Martebo, Djupvik in Eksta, Hörsne and the lime- 

 stone near Wisby. 



3. Murcliisonia moniliformis n. 



Pl. XII fig. 5-6. 



Shell tapering, turreted, narrow in proportion to its length. Whorls eleven, 

 globose, with deep suture, rapidly increasing in size. Slit band nearly in the middle 

 of the whorls or a little above it, slightly concave. Aperture ovate, with lips much 

 reflexed both near the columella and in the superior börder. Umbilicus hidden through 

 the reflexion of the columellar lip. 



Length 36 milliru., breadth 11 mill., apical augie 22°. 



From the sandstone and the oolite of Bursvik, Avhere it is common. 



4. Murcliisonia obtusangula n. 



Pl. XII fig. 7, 11, 12. 



Shell turreted, moderately tapering, with twelve ventricose whorls widened on 

 the middle in an obtuse angle, where the elevated slit hand is situated. The aperture 

 ovate. The umbilicus is hidden through a fold of the columellar lip. Ornamentation 

 in this and the two preceding species almost the same as in M. cingulata. 



Height 30 mill., br. 10 mill. Apical angle 29 °. 



