454 MK. A. WADE ON THE LLANDOVERY AND [Aug. I9II, 



somewhat bilobate. Slit-band absent. This species might easily 

 be mistaken for Belleroplion (Protowarthia) bilobatus of Sowerby. 

 It differs, however, in the rapid expansion of the aperture, a feature 

 which allies this form to the genus JSalpingostoma of Rcemer. But 

 the absence of a slit-band and the slight umbilicus place it in the 

 subgenus Protowarthia. It is most closely allied to Bellerojphon 

 elongatus of Portlock. 1 The nature of the aperture is a distin- 

 guishing feature, while the species is smaller than that of Portlock. 

 It is, however, so near to it that I have ventured to name the 

 new species after him. 



Horizon and locality. — Gaerfawr Grits, New Quarry, 

 Gwern-y-brain. ' 



Caeinaeopsis acuta Ulrich & Scofield. (PI. XXXVI, figs. 13-15.) 



' Geology of Minnesota ' Geol. Nat. Hist. Surv. Min. vol. iii, pt. 2 (1897) p. 928. 

 & pi. lxii, figs. 6-9. 



This shell appears to be new to British palaeontology. It is 

 fairly common in the Pwll-y-glo Beds, and agrees in detail with 

 the species described by the authors from the Ordovician shales of 

 Minnesota. Two specimens are figured — the first a mature form, 

 the second a young variety. 



Horizon and locality. — Pwll-y-glo Beds, Second Old Quarry,. 

 Pwll-y-glo. 



Eccyliomphalus coNTiGUTJs Ulr., var. cambeensis nov. (PI. XXXVI,. 

 fig. 16.) 



The shell is 15 millimetres high and 10 mm, broad. It consists 

 of three rapidly enlarging contiguous whorls, coiled so as to have 

 a deep umbilicus. The outer whorl embraces the inner one, so 

 that only a small portion of the inner whorl is seen. The lower 

 lip of the aperture curves downwards on to the inner whorl. 



The surface is covered with very fine and regular strise, parallel 

 with the edge of the aperture. The species is very similar in size 

 and in general characters to Ulrich's Eccyliomjpludus contiguus. 2 It 

 differs, however, in having a narrower umbilicus and in being more- 

 fin ely and more regularly marked. It is, nevertheless, so near to 

 Ulrich's species that I consider it to be simply a variety, such as- 

 one would expect to occur over the wide geographical area which 

 separates the localities from w 7 hich the specimens have been 

 obtained. 



Horizon and locality. — Very common in the black shales 

 of Gwern-y-brain. 



1 ' Eeport on the Geology of Londonderry, &c.' 1843, p. 397 & pi. xxix,. 

 figs. 4 a-4 b. 



2 « Geology of Minnesota ' Geol. Nat. Hist. Surv. Min. vol. iii, pt. 2 (1897), 

 p. 1037 & pi. lxxiv, figs. 48-52. 



