Fauna of the Lower Devonian of Torquay. 319 
half. The dental sockets are long, deep, and tubular, and lie parallel 
to the hinge-line. From each of the pits in front of the hinge-plate 
proceeds a narrow, sinuous, linguiform vascular marking, which 
closely embraces the posterior end and sides of the muscle-scar. 
The latter itself is distinct, well-marked, elongate-oblong in shape, 
with straight subparallel edges, and is divided by a narrow linear 
median ridge proceeding from the hinge-plate between the posterior 
adductor scars, which are crossed by irregular transverse wrinkles. 
The anterior adductor scars are not preserved, the anterior part 
of the shell being broken off and missing. The precise shape of 
the shell cannot be determined accurately, owing to the distortion 
of the specimen, but it seems to have been subcircular rather than 
oval or oblong, and to have been of large size, measuring probably 
about 70 mm. in width. No impression of the exterior is available 
to show the nature of the external ornamentation. As Clarke has 
pointed out, the radial lineation in Rensseleria frequently dies out 
on the posterior part of the shell, so that the surface becomes 
smooth. 
There is a second specimen in the Sedgwick Museum of a some- 
what smaller shell of the same type, consisting also of the internal 
cast of the umbonal region of the brachial valve, but it is less perfect 
than the one above described. Theinternal characters of R. strigiceps 
(Roem.) have been recently described by Kegel+ from an internal 
cast, and they seem to agree with our specimens, except that the 
latter have a visceral canal in the hinge-plate as in the American 
forms. Probably these Torquay specimens belong to a new species, 
but we cannot base one on these internal casts. 
Horizon.—Mead foot Beds. 
Locality —Kilmorie, Torquay (S. 82) (S. 83). 
Rensseleria (Trigeria) Gaudryi (Oehlert). 
According to Kegel,? who has recently discussed the classification 
of the various species which have been referred to the genus 
Rensseleria, the species R. confluentina Fuchs? is identical with 
Oehlert’s Trigeria Gaudryi,4 and the genus Trigeria can only be 
regarded as a subgenus of Rensseleria. It may be suspected that 
Davidson's R.? striatissima,’ from the Middle ? Devonian of Hope’s 
Nose, and possibly also his so-called variety of ° R. strigiceps Roem. 
from the Middle? Devonian of Hagginton Hill, Ilfracombe, 
1 Kegel, Abh. k. preuss. geol. Landesanst., N.F., Heft Ixxvi, 1913, pp. 126, 
127, text-fig. 3; p. 136, t. vi, figs. 16, 17. 
* Kegel, Abh. k. preuss. geol. Landesanst., N.F., Heft lxxvi, 1913, pp. 121-31. 
* Fuchs, Jahrb. k. preuss. geol. Landesanst., Bd. xxiv, 1907, p. 50, t. vii, 
figs. 7-14; t. viii, figs. 1-14; id., Abh. kb. preuss. geol. Landesanst. N.F., 
Heft lviii, 1909, p. 73. 
* Oehlert, Bull. Soc. Geol. France, ser. m1, vol. v, 1877, p. 593, pl.x, fig. 8; 
id., Bull. Soc. Etudes Sci. Angers, 1885, p. 2, figs. 10-17. Walther, Neues 
Jahrb. f. Min. Geol., Beil. Bd. xvii, 1903, p. 57, fig. 1. 
*® Davidson, Mon. Brit. Dev. Brach., Suppl. v, 1882, p. 19, pl. i, figs. 20, 20a. 
® Davidson, id., vol. iii, 1864, p. 10, pl. iv, figs. 5-7. 
