78 o. LINDSTRÖM, ON TlIE SILUKIAN GAHTKOruDA AND TTEROPODA OF ODTLAND. 



perior etlgo of the dorsal side and ha« nu tiibus. As to tliusc B. f ubuloisiis coiiies iieur 

 to B. elcgiuitiilus wliero thu ciiclu.scd sptices are iiiorc iiarrow. 



7. Belleroplion squamosus n. 



Pl. v ligs. 17—24. 



Shell globular, soiucwhat compressed, tlie last wlioi-1 uiucli enlarged tovvards tlie 

 apt;i'ture. Whorls four, rapidly iiicreasiiig in size, of elliptical section, tlie last one 

 subcordate with dorsal keel. Outlines of aperture iiearly circular, decply indcntcd in 

 the midst of the exteriör lip. Lateral and inferior borders sinooth and gently curved. 

 Umbilicus open and only partially concealed through the inferior corners of the aper- 

 ture, which have grovvn down outside the same. The transverse lines of growth are 

 inibricated and project as irregularly curved lamella^, standing out much in relief with 

 their edges. These edges are extremely thin, as may be gathered from a section drawn 

 ligs. 23 — 24, pl. V, and, moreover, much ii'regularly grown in many curvatures. At 

 the base they regularly join the slit band in an angle of 58°. The interstices are finely 

 striated by minute ornamental lines, parallel to the lines of growth and longitudinally 

 grooved. The spaces between the equidistant grooves are gently arched. Where the 

 grooves meet the transverse lamina}, they are a little indented and hence form a wavy 

 line. The slit band is narrow, but distinct, situated between two elevated lines, so- 

 inewhat sinuous and more prominent on the last whorl than elsewhere. Height 45 

 millim., breadth and height of aperture 38 millim. 



Found in several specimens at Lutterhorn and Länsa in Fårö, Sandvik at Fårö- 

 sund and on Kyrkberget in Wisby. 



8. Belleroplion Eiseni n. 



Pl. VI tigs. 19—21. 



Shell globular with enlarged aperture, as far as visible without laterally bent 

 margins. Sculpture of the shell very characteristic, consisting of some eight to ten 

 shallow, longitudinal grooves on both sides of the slit band and parallel with it, form- 

 ing, as it were, a broad median zone, occupying nearly a third of the dorsal surface. 

 On both sides of it there are no traces at all of any longitudinal sculpture. These 

 lines are crossed by fine and closely set transverse lines, which occupy the whole sur- 

 face and meet the slit band almost rectangularly, being only very slightly curved 

 towards the aperture. The umbilicus seems to have been open. The slit band which 

 is not w^ell preserved has probably formed an elevated keel on the body whorl. Height 

 20 millim., breadth 36 millim., the umbilicus nearly 5 millim. 



Only one fragmentary specimen was discovered by Dr G. Eisen in the bard cry- 

 stalline limestone at Wialmsudd near Fårösund in the parish of Bunge. 



