78 ORDOVICIAN AND SILURIAN BELLEROPHONTACEA. 



from the Redhill Beds of Haverfordwest and is in the Sedgwick Museum. The 

 position and affinities of this species were regarded as doubtful by me when I 

 described it, but now there can be no uncertainty as to its reference to the genus 

 Salpingo stoma and its close affinities to the Girvan species .9. asteroideum and to S. 

 grande (Barrande), 1 from Etage D in Bohemia. The specimens are crushed. 

 distorted and imperfect, and the species is not capable of a completely satisfactory 

 definition. It seems to have reached a large size, the mouth of some measuring 

 50 — 70 mm. across. 



5. Salpingostoma? infundibulum (Salter MS.). Plate XII, fig. 5. 



1878. BeJlerophoi) infundibulvm, MS. [? Salter], Cat. Canib. Silur. Foss. Mus. Pract. Geol., p. 123. 



Specific Characters. — Mouth immensely expanded, forming a large free sub- 

 circular flattened saucer; dorsal lip with small shallow open emargination followed 

 by a narrow continuous groove on inner surface (occupied by open slit ?) corre- 

 sponding to keel on outer surface and continued on to dorsum of outer whorl. 

 Ornamentation of inner surface of oral expansion composed of strong sinuous 

 frequently broken and irregularly interrupted concentric ruga?, with fine regular 

 concentric striag between them. Outer whorl of shell just before expansion of 

 mouth broadly transverse and deeply trilobed, consisting of median narrow 

 strongly-elevated subangular portion and rounded lateral portions ; lower portion of 

 outer whorl free, not interrupting or indenting lower lip. 



Dimensions. — Height of oral expansion, 43 mm. ; width of ditto, 45 mm. ; width 

 of outer whorl before oral expansion, 18 mm. 



Horizon. — Lower Ludlow. 



Locality. — Vinnal Hill. 



Remarks. — The peculiar trilobation of the outer whorl and the ornamentation 

 of the oral expansion distinguish this imperfectly known shell, of which there is 

 only the type specimen [28070] in Jermyn Street giving a full front view of the 

 mouth. Its generic reference is doubtful. 



6. Salpingostoma, sp. 



In a specimen of a species of Salpingostoma from the Sholeshook Limestone in 

 the Sedgwick Museum we get only a full front view of the mouth. This is sub- 

 lanceolate in shape, higher than wide, pointed acutely above, but rounded below ; it 

 is widest across the middle. The lips are as usual suddenly reflected outwards at 

 right angles to the plane of the shell, the lower lip being about one-fourth the 

 height of the whole aperture and the upper lip about one-half the height; there 

 1 Perner, op. cit., \>. 97, pi. lxxiv, figs. L2 14; pi. lxxxxv, figs. 22—32; text-fig. 69. 



