128 G. LIND.STROM, ON THE SILURIAN GA.STKOl'ODA AND PTEKOPODA OF GOTLAND. 



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

 Height of aperture 19 mill., width of the same 15 mill. Apical angle 86°. 



The original specimen of Hisinger, now figured anew, pi. 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 

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

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

 difference as to the relative size of the whorls. 



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

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

 shape, have been found in the hard shale of Petesvik in Ha1)blingbo. 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 Nils. 



2. Murchisonia cava n. 



PL XII lig. 4. 



Shell cylindrical, turreted, whorls, only six left in the fragmentary 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 deepl)' 

 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, Horsne and the lime- 

 stone near Wisby. 



3. Murchisonia moniliformis n. 



PL XII tig. 5-C. 



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

 globose, with deep suture, rapidly increrising 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 border. Umbilicus hidden through 

 the reflexion of the columellar lip. 



Length 36 milliin., breadth 11 mill., apical angle 22°. 



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



4. Murcliisoma olbtusangula n. 



PL XII fig. 7, 11, 12. 



Shell turreted, inodoratelj^ tapering, with twelve ventricose whorls widened on 

 (he middle in an obtuse angle, where the elevated slit, band is situated. The aperture 

 ovate. The umbilicus is hidden through a fold of the ('oluirielhir li[). Ornamentntion 

 in this and the two j>r('ceding species almost the same; as in M. cingulata. 



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



