146 MR. C, A. MATLEY ON THE CAMBRIAN [Feb. 1902, 
The shell-substance is corneous or calcareo-corneous, and com- 
posed of several layers, the inner of which are ornamented by 
numerous, very fine, slightly-raised, rounded radial striae. Some 
examples show a triangular, deltidium-like, slightly convex bulging 
of the middle part of the area below the umbo, suggesting an 
approach to the deltidium of the genus [phidea. This appears to be 
a new feature of the genus.’ The breaking away or resorption of 
this portion of the shell would leave a triangular fissure, such as that 
figured for K. latowrensis, Matthew, in Pal. N. Y. vol. viii, pt. 1, 
pl. iv, fig. 20. 
There is no doubt that the Malvern shell is very closely allied to 
the American K. cingulata, yet there seems sufficient reason for 
retaining Holl’s designation of Phillipsii as a varietal name. The 
Malvern shells are much smaller than the maximum size of the 
American form. The average dimensions of those forwarded to me 
by Prof. Groom are about 44 mm. long by 64 mm. wide, the largest 
measuring 7 by 10 mm. Davidson figured a large example, which 
when complete must have been about 11 mm. long by 16 wide, but 
even this has only half the dimensions of an example from America 
figured by Walcott.2 he American species appears to be more 
convex than the British, especially in the neighbourhood of the 
umbo, and the shell-substance of the former is calcareous, according 
to Walcott, while in the Malvern examples it is phosphatic. 
Prof. Groom’s specimens are from the Malvern Quartzite (M 170, 
M 244, M244c) and Hollybush Sandstone (M323 bir, M 443). 
Species of the genus Kutorgina are mainly characteristic of the 
Olenellus-fauna, but in America K. stissingensis is found at a rather 
higher horizon. In Sweden, A. cingulata, var. pusilla, Linrs. 
(see below) occurs in the zone of Parado«ides Forchhammeri and in 
strata with Agnostus levigatus, while one species, K. minutissima, 
is found in the Secret Cafion Shales (Middle Cambrian) and the 
Hamburg Shales (Upper Cambrian) of North America.? 
KUTORGINA CINGULATA, var. PUsILLA, Linrs. (Figs. 19 & 20, p. 147.) 
1876. Kutorgina cingulata, var. pusilla, Linnarsson, ‘On the Brachiopoda of the 
Paradowides-Beds of Sweden’ Bihang till k. Svenska Vet.-Akad. Handl. vol. iti, 
no. 12, p. 25 & pl. iv, figs. 53-54. 
The Lowest Black Shales (M 257) have yielded several fragments 
and one complete valve of a Kutorgina which differs from that. 
found in the Hollybush Conglomerate and Sandstone mainly in its 
smaller size. The valve just mentioned is a brachial valve, and 
measures about 1°75 mm. in length by 2mm. in breadth ; an incom- 
plete pedicle-valve of a rather smaller individual has also been 
found (fig. 19), and the fragments belong to rather larger specimens, 
probably about 4 mm. wide. They appear to be identical with the 
1 Since writing the above, I find that the presence of a deltidium has been 
observed in the American K. cingulata; see Beecher, Amer. Journ. Sci, ser. 3, 
vol. xliv (1892) p. 138, quoted and remarked upon by Hall & Clarke, Pal. N.Y. 
vol. viii, pt. ii (1894) p. 327. 
2 «Fauna of the Olene/lus-zone’ Tenth Ann. Rep. U.S. Geol. Sury. 1888-89 
[1890] pl. Ixix, figs. 1 & 1 a-0, 
3 Frech, ‘ Lethea paleozoica’ vol. ii, pt. i (1897) pp. 44 & 45. | 
