Cretaceous Gastropoda, and Pelecypoda from Zididand. 23 
umbilical region. It is not to be confused with Mr. Etheridge's 
Solarmm sp. indet. from the Umkwelane Hill deposits of Zululand 
(Anderson's " Second Eeport Geol. Surv. Natal and Zululand," 1904, 
pi. 2, figs. 35-37, p. 88), because of the absence of a median depres- 
sion in the whorls ; nor with that author's more lately described 
form of >S'. hedleyi from the Umsinene Eiver beds of the same 
country (Anderson's " Third Eeport, Geol. Surv. Natal and Zululand," 
1907, pi. 5, figs. 10-12, p. 85), which has a sharper and more angu- 
late contour and no indication of the isolated basal groove, being 
instead ornamented beneath by numerous revolving rows of granules. 
The new shell is also distinct from north African Cretaceous 
species, such as S. cf. granosum, Orbigny (see Peron : Desc. Moll. 
Cr^taces, Explor. Scientif. Tunisie, 1890, p. 44), which M, Peron 
has described from the Cenomanian of Tunis, being of less discoidal 
shape and without a granulate surface ; moreover, it seems to share 
no relationship with any of the European forms found in the various 
stages of the Cretaceous period, and further, it may be stated, that 
rocks of similar age in India have yielded no species which would 
suggest any close affinities with the present shell. The name ArcM- 
tectonica of Bolten having priority of Lamarck's Solarium is adopted 
on this occasion, thus following the views of 11. and A. Adams (The 
Genera of Eecent Mollusca, 1853, vol. i., p. 241), and later authors. 
Locality. — North end of False Bay. 
Architectonica kossmati, n. sp. 
Plate VIII., fig?. 11, 12. 
Description. — Shell small, elevated, broadly conical, composed of 
five or six depressed, medianly concave whorls obtusely angulate at 
margins, and separated by a narrow and well-defined suture ; base 
convex, nearly circular, furnished with a deep funnel-shaped umbilicus 
bordered by a sub-angulate periphery with a crenulated structure ; 
sculpture of upper surface consisting of numerous, fine, equidistant 
spiral lines (about 14 on the last volution), crossed by delicate, 
slightly oblique, and numerous lines of growth (sometimes producing 
minute granulations), which continue over the margin to the basal 
surface, where a similar ornamentation exists ; the surface of the 
umbilical cavity is strongly striated both spirally and longitudinally ; 
aperture sub- quadrate. 
Dimensions. — 
Height 10 mm. 
Diameter (maximum) 12 ,, 
Observations. — The foregoing characters are drawn up from an 
only specimen found in Mr. Anderson's collection, which is in a fair 
