Vol. 57.] FROM THE ISLAND OF AREAN. 231 



Ammonites (JEgoceras) angulatus, Schlotheim. (PL IX, fig. 1.) 



1820. ' Die Petrefactenkunde ' p. 70. 



1870. Tate, ' Irish Liassic Fossils ' Rep. Belfast Nat. Field Club, App. i, p. 9. 

 1878-86. Wright, ' British Lias Ammonites ' Monogr. Pal. Soc. p. 318 & pi. xiv, 

 figs. 5-6. 



Several more or less fragmentary casts of small shells, and one or 

 two pieces of larger ones (about 80 mm. in diameter), are un- 

 doubtedly representatives of this species, which is the only form of 

 ammonite recognized among these Arran fossils, and alone serves 

 to indicate the horizon as that of the Ammonites angulaius-heds. 

 Tate records this species as of rare occurrence in both Ammonitts 

 angulatus- and Ammonites planorhisAiadiS in the Belfast area. 



Amberleta acuminata (Chapuis & Dewalque). (PL IX, fig. 2.) 



1854. TrocJiiis acuminatus, ' Descr. des Foss. des Terrains second, du Luxem- 

 boiirg ' Mem. cour. Acad. Koy. Belg. vol. xxv, p. 82 & pi. xii, fig. 3. 



1876. Eucyclus acuminatus, Tate & Blake, 'Yorkshire Lias ' p. 346 & pi. x, fig. 20. 



Specimens from the Ammonites anc/ulatus-heds of Redcar were 

 referred to this species by Messrs. Tate & Blake. One Arran 

 specimen, which has the markings well preserved, agrees with the 

 examples of this species in the Tate Collection, preserved in the 

 Museum of Practical Geology. A portion of another specimen may 

 belong here, or may perhaps be a piece of Amherleya imhricata. 



Cerithium Semele (?) Martin. (PL IX, fig. 3.) 



I860. ' Paleont. de I'lnfra-Lias de la Cote-d'Or ' Mem. Soc. Geol. France, ser. 2, 

 vol. vii, p. 75 & pi. ii, figs. 8-10. 



1870. Tate, ' Irish Liassic Fossils ' Rep. Belfast Nat. Field Club, App. i, p. 10. 

 1876. Tate & Blake, ' Yorkshire Lias ' p. 350. 



A specimen showing parts of three whorls agrees so nearly wibh 

 Martin's figure of this species that it is referred to the same. The 

 whorls are rounded, but there is a prominent, longitudinal, crenu- 

 lated ridge along the middle : below this ridge are three, and above 

 it two, less distinctly marked lines. The whole shell seems to have 

 been ornamented by fine but distinct lines in the direction of the 

 growth-lines. This species was recorded by Jules Martin from 

 the lowermost Lias and Avicida contorta-zone of the Cote d'Or. 

 Prof. Tate mentions it from the Ammonites amjulatus- and Amm. 

 Bucklandi-heds near Belfast, while he & Prof. Blake have fouud it 

 at the same two horizons at Eedcar. 



Cerithium sp. (of. C. Falsani, Dumortier). 



A badly-preserved impression of a Cerithium about 14 mm. long 

 and 4 mm. wide shows twelve whorls strongly angulated and 

 nodular in the middle ; there seem to be two fine longitudinal lines 

 above, and two below, the angle. Indications of ridges in the 

 direction of the lines of growth are to be traced on both the upper 

 and under parts of each whorl. The ornamentation of this shell 

 agrees most nearly with that of C. Falsani of Dumortier^ which 



^ 'Etudes paleont. sur les Depots Jurass. du Bassin du Rhone,' vol. i 

 (I864)p. 141 &pl. xxiii, fig. 7. 



