f 6 
Tate — List of Irish Liassic Fossils, 
faint concentric striae. The aperture is not exposed ; but I have no hesitation 
in referring the shell to the genus Chemnitzia. 
Geological Position — Zone of “A. angulatus,” Island Magee, Co. Antrim 
(S. A. Stewart ), 
6. Chemnitzia Berthaudi, Dumortier, Etudes Pal. sur les Depots 
Jurassiques du Bassin du Rhone, p. I74> tab. xiv, fig. 2, .1867. 
Chemnitzia Tylori , Tate, Quart. Jour, Geol. Soc., Vol. xx, p. 3 1 3 (1867)- 
Shell turreted, elongated, consisting of ten whorls separated by a deep 
suture, concave, and ornamented by about twenty very prominent curved 
smooth ribs ; the sulci faintly striated ; base slightly carinated, smooth or faintly 
radiated. Total length 3 inch, breadth of last whorl -07 inch. 
Affinities and Differences. — By its ornamentation closely allied to C. costifera, 
Piette, and Cerithium Henrici , Martin, but differs from the former apparently 
in the proportion of its dimensions, and in the less arched outline of the costae ; 
and from the latter in being only about half the length of that shell, which is pro- 
vided with only eight whorls. I have no hesitation in referring the shell I had 
described as C. Tylori to C. Berthaudi , Dumortier, which has priority by some- 
months. 
Geological Position. — C. Berthaudi vs, a common shell in the zone of “ A. 
angulatus” Island Magee, Co. Antrim. The type of the species is unique, 
and was obtained from the zone of “A. Bucklandi ” at Peronne, Rhone. 
7. Solarium Thomsoni, now spec ., Plate I. fig. 9, 
Shell orbicular, a little wider than high, spire slightly raised, composed of 
lour whorls, smooth, or ornamented with about 6 raised lines ; last whorl 
rounded, smooth ; aperture quadrate ; base flat, with fine strice of growth 
umbilicus narrow and slightly crenulated on its border. Height, ‘075 i nc h \ 
diameter, ‘085 inch. 
Remarks. —S. Thomsoni is allied to S, lenticular e , Terq., but differs in its 
more embracing whorls and Rotella-like appearance, in its smaller umbilicus, 
and its more conical form. 
Geological Position—. Zone of “ A. angulatus , ” Glenarm ; (rare, R. T). 
The species is dedicated to Professor Wyville Thomson, F. R. S-., President 
of the Natural History Society, Belfast. 
8. Crypt^enia Brycei. Tate, Quart. Jour. GeoL Soc., Vol, xxiii., p, 
413 (1867). Plate I. fig. 13. 
Shell subdiscoid, depressed ; test thin, whorls four, nearly flat or slightly 
concave ; bluntly carinated ; upper surface of the whorls transversely striated ; 
base convex, smooth ; callosity large, circumscribed by a sulcus, slightly exca- 
vated near the columella lip ; siphonal band narrow, rather above than below 
the keel ; aperture, sub-triangular. 
