38 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [NoV. 9, 



This species has hitherto been known only from a cast, and has 

 been referred to three genera, of which I would retain that of Tur- 

 rltella. The mouth of the shell, though somewhat angoilar below, is 

 neither notched nor produced into a canal, and cannot therefore be 

 either a Cerithium or a Nerincea. The band on the mould is the cast 

 of the internal sulcus, and has no relation to the plaits of a Nerincea. 



Dimensions. — Total length 3 inches; height of last whorl | inch. 



Locality. — It is one of the most ubiquitous species in the White 

 Limestone (Upper Chalk) of Ireland. I have also found it, though 

 rarely, in the Spongarian Zone (Upper Chalk) at Woodburn. Speci- 

 mens with the test preserved are very rare, and the same is true 

 of the majority of the Mollusca. 



Casts of T. unicarinata occur in the Upper Chalk of Norwich. 



6. SCALARIA ALB^-CEET^, SpCC. UOV. PI. III. fig. 6. 



Shell turreted; whorls about ten, contiguous, separated by a linear 

 suture ; ornamented transversely by oblique, flexuous, bluntly cari- 

 nated ribs ; interspaces with narrov/ sulci coincident with the curva- 

 ture of the ribs. Mouth circular ; umbilicus minute. Body- whorl 

 with an anterior keel, furnished with fifteen ribs. 



Dimensions. — Length 1^ inch ; height of last whorl 5 inch. 



Affinities and Differences. — S. alhce-cretce bears a close resemblance 

 to S. canaliculata, D'Orb., and S. albiensis, D'Orb., both from Neoco- 

 mian strata ; but it differs from them more particularly in the almost 

 entire obliteration of the sutures and in the less obtuse character of 

 the ribs. 



Locality. — A few specimens were obtained from the " flinty flag " 

 at Kileorig, Lisburn. White Limestone (Upper Chalk). 



7. CALYPXKiEA Geayana, spec. uov. PI. III. figs. 8rt, 86. 



Shell oval, conical, elevated; summit slightly recurved. Orna- 

 mented by numerous angular raised ribs, decussated by flexuous 

 and inequidistant lines of growth. 



Dimensions (of largest specimen). — Height -^^ inch ; diameters -^ 

 and i^ inch. 



Locality. — Pare in the White Limestone (Upper Chalk) of Kilcorig, 

 Lisburn. 



I dedicate this species to my friend Mr. W. Gray. 



8. CiNTJLiA catenata, spec. nov. PI. III. figs. 4 a.-4 c. 



Shell oval, ventricose, very globose, thick ; spire composed of four 

 whorls, of which the last is higher than broad, and occupies nearly 

 the total length. It is ornamented with about thirty longitudinal, 

 smooth, flat ribs, which increase in breadth from the base to the 

 suture of the body-whorl. The narroAv sulci betAveen the ribs are 

 occupied by elHptical, somewhat confluent punctations in chain-like 

 rows. Mouth large ; lip thick and reflected, provided with numerous 

 equal denticulations ; columella with a single plait inferiorly. 



Affinities and Differences. — This species is allied by its form to 



