318 Dr. F. BR. Cowper Reed— 
Localities—(1) New Cut (8.17, 31); (2) below Kilmorie; (3) 
South of Hope Farm, new drive to Hope’s Nose (M.P.G. 1169, 
1175, 1179, 1180 Ussher Coll.). 
Rensseleria (Rhenorensseleria) crassicosta Koch. 
Kegel + has put this species together with R. strigiceps F. Roem. 
into a new subgenus, Rhenorensseleria, which he has established 
on account of the difference in the structure of the hinge apparatus 
of the brachial valve from the typical American representatives of 
the genus, which has for its type R. ovoides Haton. The subgeneric 
separation of this Huropean group of species is reasonable, and the 
name may be conveniently adopted. Amongst the fossils in the 
Sedgwick Museum from the Red Beds of the New Cut, Torquay, 
there is one pedicle-valve which may with some confidence be 
ascribed to Koch’s species R. crassicosta, which Fuchs ? and Kegel 3 
have described and figured in some detail. Our specimen measures 
about 16mm. in length, and shows the characteristic shape and 
ribbing. 
Horizon.—Red Beds (Staddon Grits). 
Locality —New Cut, Torquay (8. 32). 
Rensseleria (Rhenorensseleria) cf. strigiceps F. Roemer. 
In the Sedgwick Museum, Cambridge, there is the internal cast 
of the posterior portion of a brachial valve of a large brachipood, 
which shows the peculiar and interesting characters of the typical 
American representatives of Rensseleria, with which Clarke * 
includes Hall’s genus Amphigenia,® the difference between them 
lying only in the fusion or separation of the dental plates, and the 
presence or absence of alowsupporting septum. Our specimen® shows 
a large massive triangular hinge-plate fused to the inner surface of 
the brachial valve, but obscurely divided into two halves by a shallow 
median groove; each half has its face slightly hollowed and from 
its inner anterior angle arises the slender crural process on each side. 
Between the bases of the crura, which are close together, the hinge- 
plate projects as a very short blunt, low, median process or ridge, 
on each side of which is situated a rather deep pit excavated in the 
thickness of the shell. The hinge-plate is also traversed by a small 
median, subcylindrical tunnel (the visceral canal), which arises at 
the beak, and runs from this point forwards through the substance 
of the hinge-plate to open into the interior of the shell by means of 
a funnel-shaped aperture on its thick anterior face. This tunnel seems 
to become larger and quadrangular in cross-section in its posterior 
1 Kegel, Adhk. k. preuss. geol. Landesanst., N.F., Heft lxxvi, 19138, pp. 126-32. 
2 Fuchs, Jahrb. k. preuss. geol. Landesanst., 1903, p. 44. t. vi, fig. 1. 
3 Kegel, op. cit., p. 135, t. vi, figs. 14, 15, and references. 
4 Clarke, Mem. New York State. Mus., No. 9, pt. i, 1908, p. 165; ibid., 
pt. 11, 1909, p. 81. 
> Hall & Clarke, Paleont. New York., vol. viii, Brach. ii, p. 252. 
§ Reed, Journ. Torquay Nat. Hist. Soc., vol. ii, No. 6, 1920, p. 341. 
