166 



1. Semicassis transenna, spec. nov. Plate viii., fig, 2, 



Shell thin, ovate, ventricose, contracted at the base ; spire 

 moderately produced, broadly conical, ending in a very small 

 pullus of two and a half smooth, narrow, con^^ex whorls. 



Whorls four, excluding the pullus, subangulated in the pos- 

 terior-third, slightly margined in front of the suture, with raised 

 spiral threads cancellated by fine transverse equidistant threads.. 

 The spiral threads are about twelve on the penultimate whorl,, 

 the one on the angulation being the most prominent, those on 

 the posterior sloj^e (about five or six) being more slender than, 

 the anterior ones. The cancellation is obscure on the median 

 portion of the last whorl, and the base is spirally flatly ridged 

 only. 



Aperture oval-oblong, obtuse behind, rounded in front ; outer 

 lip thickened, hardly ascending on the penultimate whorl ; mar- 

 gin plain or obscurely dentately ridged. Columella-expansion 

 erect, smooth ; pillar twisted wdth a few^ slender oblique plaits. 



Dimensions. — Length, 28; breadth, 17 ; length of aperture, 19. 



Localities. — Lower beds at Muddy Creek ; blue clays at 

 SchnaiDper Point; calciferous sandstones. River Murray Cliffs 

 near Morgan (R. T.) ; Table Cape (R. 21. Johnston/). 



This highly sculptured shell has no analogue in living creation ; 

 it is very common at Muddy Creek, and exhibits very slight 

 Tariability. 



2. Semicassis subgranosa, spec nov. Plate vii., fig. 10. 



Shell ovate, somewhat contracted at the base ; spire acuminate^, 

 moderately elevated, ending in a conical pullus of three smooth 

 convex whorls. 



Whorls four, excluding pullus, moderately convex, margined at 

 the anterior suture and bounded by an ante-sutural, concavely 

 dei^ressed, narrow zone. The first Avhorl finely lirate ; the second 

 and third encircled with about seven rows of granules which are 

 on slightly oblique transverse folds ; penultimate whorl with 

 close-set oblique rounded cost?e which are cut into gTanulose- 

 crenatures by seven or eight encircling sulci. 



Last whorl somewhat ventricose, sculptured with oblique costae,. 

 which fade away at less than half way to the base, and encircling 

 sulci which produce granulose-crenatures on the costse, more 

 conspicuously so on the first two costa? anterior to the sutural 

 depression ; the marginal band obscurely granulose. Aperture 

 concealed in the only known specimen. 



Dimensions. — Length, 55 ; breadth, 34; lengih of aperture, 37. 



Locality. — Hard raggy-limestones, Edithburgh, Yorke's Pen- 

 insula. 



This species has the shape of S. semigranosa, but differs by the 



