E. S. Cobbold — Cambrian Hyolithidoe from Hart skill. 155 



Kutorgina cingulata, Davidson, id., p. 342, pi. i, fig. 25, 1871. 

 A', cingulata Phillipsi (Holl), Matley, Q.J.G.S., vol. lviii, p. 145, 1902. 

 Micromitra (Paterina) Phillipsi (Holl), Walcott, U.S. Geol. Surv. Mon., 

 vol. ii, p. 351, pi. iii, fig. 8, 1912. 



One external cast of a ventral valve and a few obscure fragments 

 are very like specimens obtained at Malvern and Comley. 



Tbe general outline and surface characters agree with Holl's 

 species, but, in the absence of further specimens and particularly 

 those showing the false area and pseudodeltidium, the reference is 

 made with considerable reserve. 



Horizon and Locality. — Lower Cambrian : the red sandy lime- 

 stone of Woodlands Quarry, Hartshill. 



GASTEROPODA. 



Platyceras, Conrad. 



Platyceras cf. primavum, Billings. (PI. IV, Fig. 34.) 



Platyceras primazvum, Billings, Can. Nat., N.S., vol. vi, p. 220, 1871. 



Walcott, U.S. Geol. Surv., Bull. 30, p. 130, 

 pi. xii, figs. 5, 5a, 1886. 

 ,, ,, ,, Grabau, Occ. Papers Boston Nat. Hist. Soc, 



vol. iv, pt. iii, p. 628, pi. xxxi, figs, la, b, 

 1900. 

 A single specimen [37] consisting of an internal cast of a whorled 

 shell with oval aperture appears to be nearly allied to or, possibly, 

 identical with Billings' species. In the absence of better preserved 

 specimens the reference must remain doubtful. 



Horizon and Locality. — Lower Cambrian: the red sandy limestone 

 ■of Woodlands Quarry, Hartshill. 



Helctonella, Grabau & Shinier. 



Helcionella (?) emaryinata, sp. nov. (PI. IV, Figs. 26, 27.) 



The type-specimen [46] shows two internal casts, from, one of 

 which a fragment of the external cast was preserved during develop- 

 ment, indicating the character of the surface. 



Diagnosis. — Shell strongly recurved so that the apex projects 

 beyond the limit of the posterior margin ; aperture almost circular, 

 slightly flattened anteriorly owing to the presence of a rhomboidal 

 notch; apex (in the cast) somewhat blunt; exterior with many 

 irregular raised lines of growth, some of which are more pronounced 

 than others ; all conform m shape to the apertural notch ; no radiating 

 striae detected in the material to hand ; interior marked with several, 

 irregularly arranged raised concentric lines, seen as depressions in 

 the cast, in addition to which there are in one of the specimens 

 (Fig. 26) two symmetrically arranged rounded and ill-defined 

 depressions, that simulate muscle-scars of Brachiopoda, but it seems 

 more probable that they are somewhat fortuitous and possibly 

 connected with the trace of the apertural notch. 



Dimensions. — Length of aperture about 45, width 5, height 

 25 mm. 



Observations. — So far as known to the writer the aperture of 

 Helcionella is entire. The notch in this species is suggestive of 



