76 ORDOYICTAX AND SILURIAN BELLEROPHONTACEA. 



the species are undoubtedly closely allied. It is probable that the shell described 

 by me as Bellerophon ? multirugatus^ from the Red hill Beds (Upper Bala) of the 

 Haverfordwest area is also closely related, but it is not well enough known to 

 make a complete comparison ; the ornamentation seems almost identical. The 

 crushed and distorted specimen said to be from Mulloch described and figured by 

 McCoy 2 as .//. subdecussatus, of which his figure was an inaccurate restoration, 

 appears to present many points of similarity; the matrix is not that of the 

 typical Mulloch Hill Sandstone, and the mode of preservation so much resembles 

 that of 8. asteroideum from the Starfish Bed that I am inclined to think this is its 

 true horizon. 



The dorsal slit is not well seen in any of our specimens, but its presence can 

 here and there be detected, though near the mouth its place is always occupied by 

 the weak carina. One fragment [20713] of a shell from Tyrone in the British 

 Museum probably belongs to this species. 



2. Salpingo stoma buccinoideum, sp. nov. Plate XII, fig. 3. 



Specific Characters. — Shell sublenticular, somewhat compressed; composed of 

 3 — 4 whorls in contact but not overlapping, rapidly increasing in height and less 

 rapidly in width. Whorls sublanceolate in cross-section with gently convex sides. 

 somewhat swollen near base and acutely carinated dorsum; terminal part of outer 

 whorl free and suddenly expanding into large trumpet-shaped mouth of sub- 

 circular shape ; inner lip free. Umbilicus wide, shallow, open, exposing all the 

 inner whorls ; umbilical edge rounded. Traces of slit in dorsal carina. Surface 

 of shell unknown. 



Dimensions. — Height of shell, 27*0 mm.; height of outer whorl before becoming- 

 free, 12-0 mm.; width of ditto, 9*0 mm. ; width of mouth, c. 30'0 mm. ; height of 

 mouth, c. 20 mm. 



Horizons. — (1) Balclatchie Group (conglomerate), Lower Ordovician. (2) 

 Stinchar Limestone Group, Lower Ordovician ?. 



Localities.— (1) Balclatchie, Girvan ; (2) Minuntion, near Grirvan. 



Remarks. — There is only one good specimen of this species from Balclatchie in 

 Mrs. Gray's Collection, and this is chosen as the type; for the Minuntion specimen 

 is poor and of doubtful reference. The large trumpet-shaped mouth and com- 

 pressed carinate whorls are distinctive features. Perhaps Snip, compressum 

 (Eichw.), 3 is allied to it, and Snip, megalostoma, Eichw. 1 also shows points of 

 resemblance. 



1 Reed, ' Geol. Mag.' [5], vol. iii (1906), p. 365, pi. xx, figs. 11, 11 a. 



2 McCoy, ' Syu. Brit, Pal. Foss. Woodw. Mus.,' p. 311, pi. 1, L, fig. 25 (uou 25a). 

 " Eiclmald, 'Leth. Ross.,' vol. i, pt. 2, p. 1068, pi. xli, fig. 9. 



1 Ibid., p. 1069, pi. xli, figs. 5 a— c. 



