458 Transactions. 



Acteon subovalis n. sp. (Plate XXXVI, fig. 37.) 



Shell small, 9 mm. by 4 mm., narrowly oval. Sculpture consisting of 

 several rounded spiral bands ; interstices narrow except on the body-whorl, 

 where they are as broad as the bands ; 5 bands on the penultimate and 20 

 on the body whorl. The interstices between the spiral bands on the body- 

 whorl are marked by exceedingly small cross-lines : these are somewhat 

 oblique above, but are rectangular to the spiral bands in the middle of the 

 whorl. Spire with 5 whorls. Suture deeply impressed or canaliculated. 

 Columella with a prominent fold near the top. 



Three specimens, in an indifferent state of preservation. Type in the 

 Otago Museum. 



Nucleopsis major n. sp. (Plate XXXVI, fig. 38.) 



Shell small, 10 mm. by 7 mm., shortly oval or subturbinate. Sculpture, 

 flat spiral bands with narrow interstices : there are 9 of these on the pen- 

 ultimate and 28 on the body whorl. No transverse striae can be seen in 

 the narrow grooves. Spire short, turriculate, consisting of 5 whorls, each 

 strongly shouldered. Suture canaliculate. Aperture oval ; inner lip some- 

 what thickened, but no fold on the columella. Umbilicus large. 



One specimen, in a good state of preservation. Type in the Otago 

 Museum. 



This genus has few representatives. This species is placed in it because 

 there are no folds on the columella and the umbilicus is distinct. The 

 genus appears to be restricted to the Eocene. Another shell recently found 

 in this bed belonged to Tornatellaea. 



Haminea cingulata n. sp. > (Plate XXXVI, fig. 39.) 



Shell of moderate size, nearly oval, 18 mm. high, 7 mm. wide. Sculpture 

 consisting of flat grooves ; spiral grooves about one-quarter of the width 

 of the intervening flat ridges ; the ridges are arranged spirally, about 30 

 to 35 in number, and are crossed by numerous growth-lines ; the grooves 

 become narrower towards the base ; there are minor narrow grooves on the 

 flat ridges — 3 on the anterior, but decreasing to 1 only on the posterior 

 ridges. Vertex imperforate ; lip reflexed. Body-whorl oval, broadly 

 rounded above, convex in the middle, and narrowly rounded below. Aper- 

 ture as high as the shell, broad above and produced considerably above the 

 vertex, but narrowed somewhat below. Outer lip thin, but thickened near 

 the vertex. Middle nearly straight, slightly convex below. 



The genus does not occur in strata below the Miocene. 



The genus was kindly identified for me by Mr. Suter. The shell is 

 certainly very similar to that of Bulla, and I am by no means satisfied 

 that it is correctly placed. 



Several specimens. Type in the Otago Museum. 



Malletia elongata n. sp. (Plate XXXVI, fig. 41.) 



Shell of moderate size, 28 mm. by 13 mm. Form elongated oval with a 

 posterior extension ; anterior end shorter than the posterior ; dorsal sur- 

 face slowly descending, then regularly rounded ; basal margin rounded ; 

 posterior and anterior and dorsal margins of the valvea form a moderate 

 keel. Sculpture consisting of about 40 equidistant rounded concentric ribs ; 

 the ribs are close together near the umbones, but farther down they become 

 narrower than the intervening grooves. 



