282 DUBLIN UNIVERSITY 



" Loxonema (Phillips, Pal. Foss., Cornwall, p. 98). — Spiral, turricu- 

 lated, whorls convex, their upper edges addressed against the next 

 above, without spiral band, mouth oblong, attenuated above, effused 

 below, with a sigmoidal edge to the right lip ; no umbilicus, surface 

 covered by longitudinal threads or ridges, generally arched." 



This genus now includes many Palaeozoic shells, formerly called 

 Melania, Turritella, Scalaria, Rissoa, and Terebra. 



I. "Loxonema sulculosa {Melania sulculosa), (Phil., Geol. Yorksh., 

 PL xvi., Fig. 1, a)." 



Some fine specimens of this species were found by Mr. Wright at the 

 Windmill Quarry, near Cork. (PI. xxi., Figs. 1 and 1.) 



II. " Loxonema rugif era (Melania rug if era, Phillips, Geol. Yorksh., 

 PI. xvi., Fig. 26)." 



This beautiful species was found, for the first time in Ireland, by 

 Mr. "Wright, at the Windmill Quarry, near Cork. (PL xxi., Figs. 2 

 and 2.) 



III. "Loxonema constricta (Z. pulcherrima, M'Coy, Carb. Foss., 

 PL vii., Fig. 7). Loxonema sinuosa (Phil., PaL Foss., Cornwall, 

 PL xxxviii., Fig. 182)." 



From the neighbourhood of Clonmel. It is not an nnfrequent fossil 

 in the Carboniferous Limestone of Ireland, 



IV. •' Machrocheilus acutus (Sow.). — Windmill Quarry, near Cork. 

 (PL xxi., Figs. 3 and 3)." 



These specimens would be referred by some to M. curvilineus, but the 

 truth is, that the species of this genus are very arbitrary ; and it appears 

 better for the present to consider them to belong to the well-known form 

 M. acutus, to which they are evidently closely allied. 



V. " Cerithioides telescopium (new) Generic characters : same as 



those of Cerithium, with the exception of the mouth, which is unknown. 

 Sp. character : Elongated, conical, whorls numerous (12), slightly con- 

 vex, smooth, with a faint subcentral band ; base of shell provided with 

 five or six well-marked longitudinal concentric grooves, extending from 

 the columella nearly to the outer border." 



From the Windmill Quarry, near Cork. (PL xx., Figs. 2, 3, 4.) 



VI. " Cerithiodes (n. sp.). Carrigtuohill, near Cork. This is a spe- 

 cies distinct from the former, but not sufficiently well marked in the 

 specimens I have seen to admit of description. It has a narrow band on 

 the bottom of each whorl. It differs little from some specimens of Tur- 



