Tate — List of Irish Liassic Fossils. 17 



Remarks. — C. Brycei is somewhat intermediate between C. caepa, Desl., 

 and C. expansa, Sow. ; it is related to the latter by the concave and carinated 

 whorls, by the band being above the keel, and by the large callus, but differs 

 in its more regularly conoidal form, without the ventricosity of the under sur- 

 face, and by the absence of the raised border to the posterior suture. 



Geological Position. — Zone of " A. angulatus," Island Magee ; (rare, 

 Gray & Tale) ; Garron Point, Co. Antrim ( R. T). 



9. Tornatella Robinsoni, iiov. spec., Plate I. fig. 7. 



Shell ovate-oblong ; spire produced, apex acute ; whorls scalariform, a 

 little obtuse, and with an elevated margin ; the whole surface ornamented with 

 fine longitudinal striae, whilst from the posterior suture fine curved lines pro- 

 ceed to a little beyond the shoulder of the whorl ; aperture ovate, acute ; 

 columella with a single plait. 



Geological Position. — Zone of " Belemnites aculus," Ballintoy ; very rare 

 (Coll. Belfast Museum). 



Dedicated to Mr. Hugh Robinson, one of the energetic Secretaries of the 

 Belfast Naturalists' Field Club. 



10. Dentalium Portlocki, nov. spec, Plate I. fig. 15. 



1843 Dentalium tenue, Portlock. loc. cit, p. 118 (non Goldfuss, 1841). 



1856 Dentalium Andleri, Oppel, Die Juraformation, p. 93 (probably). 



1863 Dentalium minimum, pars, Tate, Quart. Jour. Geol. Soc, 

 Vol. xx., p. 3. 



1867 Dentalium tenue, Tate, id., Vol. xx., p. 311. 

 Remarks. — In 1863, I referred D. tenue, of Portlock, to D. minimum, 

 Strickland, as I then considered the two names synonymous, adopting the latter, 

 because the specific name applied by Portlock was pre-occupied by a Dentalium 

 described by Minister, to which species his shell is not referable ; at a later 

 period I regarded them as distinct, and erroneously gave priority to Portlock's 

 employment of the specific name. In giving the above denomination to the 

 species described by Portlock, I wish to commemorate the labours of that 

 geologist. The original diagnosis is as follows : — " The longest -4 of an inch, 

 is about '04 of an inch in diameter at the largest end, and tapers to a fine 

 point ; it is very slightly curved." D. Andleri, Oppel, is probably a synonym 

 to D. Portlocki; the only character given is, that it is small — "die kleine 

 species ;" but, assuming that the two names refer to the same species, the im- 

 perfect diagnosis of Oppel justifies me in discarding his name. 



11. Pleurotomaria Tectaria, nov. spec. 



Shell turbinated conical, scalariform, spire acute ; whorls six, subquadrate, 

 last whorl with two prominent carinse, separated by a slightly concave area ; 

 surface of whorls strongly longitudinally striated, upper part of each whorl 



3 



