78 G. LINDSTROM, ON THE SIMIIUAN GASTROPODA AND I'TICKorODA OF GOTLAND. 



|)('rior edge u( the dorsal side and lias no tubes. As to tliese B. tubulosiis comes near 

 to l>. elegaiitulus wliere the enclosed spaces ai-e more nari'ovv. 



7. Bellerophon squamosus n. 



ri. V ligs. 17—24. 



yiudl globular, somewhat compressed, the last wlioi'l much enlarged towards the 

 apei'ture. Whorls tour, rapidly increasing in size, ot' elliptical section, the last one 

 subcordate with dorsal keel. Outlines of aperture nearly circular, deepl}' indente<l in 

 the midst of the exterior li|;. Lateral and inferior borders smooth and gently curved. 

 Umbilicus (jpen and only partially concealed tlirough the inferior corners of the aper- 

 ture, which have grown down outside the same. The transverse lines of growth arc 

 imbricated and project as irregularly curved lamella', standing out much in relief with 

 their edges. These edges ai'e extremely thin, as may be gathered from a section drawn 

 figs. 23 — 24, pi. V, and, moreover, much irregularly 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- 

 mewhat 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 Lansa in Faro, Sandvik at FarO- 

 sund and du Kyrkberget in Wisby. 



8. Bellerophon Eiseni n. 



PI. VI ligs. 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 parallerwith 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 well 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 hard cry- 

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



