1864.] TATE CRETACEOUS EOCKS OF IRELAND. 37 



markedly more abruptly impressed ; the lobes also are more angular 

 and complex. 



From A. inomatus, D'Orb., to which species Portlock referred his 

 specimens of A. occlusus, it is distinguished by its closed umbilicus. 



Locality. — Rare in the White Limestone of Kilcorig, Lisburn. The 

 specimens in the Museum of Practical Geology were collected from 

 the Upper Chalk of Dungiven. 



2. Heltcoceras HiBERNicrM, spec. nov. PI. Ill, fig. 2. 



As the fragment figured is the largest portion of this species that 

 I have found, a description of the shell from such materials would 

 be imperfect ; but the sutiiral markings, which differ markedly from 

 those of any known species, afford a good specific distinction. 



Locality. — Kilcorig, Lisburn, in the White Limestone (Upper 

 Chalk) ; it is rare. 



3. Scaphites elegans, spec. nov. PI. III. fig. 3. 



Projecting part of the shell with flattened sides and convex back. 

 The sides with an inferior and superior row of spinous tubercles. 

 Three sets of curved costse decorate the shell : one set, few in num- 

 ber, arise on the inner margin and pass between the tubercles over 

 the back, while the other two sets arise from the tubercles and are 

 similarly continued over the back. 



Locality. — Rare at Lisburn. Several specimens are in the Irish 

 Collection deposited in the Museum of Practical Geology, from the 

 White Limestone (Upper Chalk) of Dungiven, co. Londonderry. 



4. PLETJKOTOilARIA ThOMSONI, SpCC. nOV. 



Turbo ? hicannatus, Sow., in Portlock's Geol. Rep. Londonderry, 

 &c., p. 421 ; not P. bicarinata (Trochus, Sow.), Morris, Cat. 

 p. 271. 



White Limestone (Upper Chalk), Lisburn ; Tamlaght, eo. Derry. 

 I dedicate this species to Mr. G. Thomson, who has largely aug- 

 mented the list of species of the Hibernian Greensand of Woodburn. 



5. TlJRRITELLA TJNICARINATA, Woodward, Sp. PI. III. fig. 7. 



Cerithium unicarinatum, Woodward, Geol. Norfolk, pi. 6. f. 21. 

 Turritella ztmcaWnato, Woodward ; Portlock, Geol. Rep. p. 421, 



{non Quenstedt). 

 Nerincea tmicat-inata, Woodward ; Morris, Cat. p. 264. 



Shell turreted, elongated, without an umbilicus, many-whorled ; 

 whorls convex, angular below ; upper surface ornamented with about 

 thirty fine, crenulated, longitudinal, equidistant ribs, with often 

 smaller ones interposed ; lower surface similarly ornamented. Inner 

 surface of the whorl with a medial longitudinal sulcus, which is not 

 impressed to the exterior as a band. Suture impressed. Cast smooth, 

 with a single medial longitudinal band on the upper part of each 

 whorl. 



