20 DUNDRY GASTEEOPODA. 



There can be little doubt about the occurrence of this shell at 

 Dundry. It is ornamented with regular spiral lines, and some 

 much fainter transverse lines. The two oldest whorls have two 

 strong keels, but the young whorls are not sharply keeled like 

 the old ones. There is a thickening on the columella in one of 

 our specimens. The spines are perfect in none, but the spine on 

 the back of the whorl has left a projection on the internal 

 mould. 



There are six specimens in the Museum. 



Locality — Dundry. Inf: Ool. 



AIAEIA DTJNLEIEIS^SIS, n. sp. PI. 1, fig 5. 



Shell fusiform, elongate ; whorls 7-9 angular : the keel not 

 quite in the middle of the whorl, but inferior thereto ; on the 

 keel is a series of tubercles, probably 12 — 14 on a whorl, which 

 do not form costas in the older whorls, i. e. the three last, but are 

 vertically compressed ; the surface shows faint transverse lines; 

 there are fijie longitudinal lines, which are stronger near the 

 suture. 



The character of the keel and tubercles distinguish it from 

 A. hamus, Desk, and A. stdcicostata, Piette. 



We have three specimens in the Museum. 



Locality — Dundry. I7tf. Ool. 



ALAEIA TEINITATIS, n. sp. PL 1, fig. 6. 



The materials for this species are very imperfect, but it cannot 

 be identified with any previously described. 



The shell is very acute ; whorls angular, about 8 in number; 

 the keel is very near the inferior edge of the whorl, and not 

 parallel to the suture ; this is the most marked feature of the 

 shell — it is caused by a spine apparently on the keel at the same 

 place, in successive whorls, so that there is sometimes an 



