570 PEOP. E. J. GA.EWO0D 0^" THE LOWER CAEBONIFEEOTJS [DeC. I9I2, 



resemble at first sight those of Productus suhlcevis, originally 

 figured by Sowerby as Fr. humerosus. 



Horizon and localities. — This form is confined to one 

 horizon in the Korth- Western Province, at the summit of the 

 Lonsdalia Beds, where it is present in such abundance as to make up 

 a definite band at the summit of the Mauld's-Meaburn Limestone. 

 Bank Moor, Gathorn Plain, Shap District ; High-Cup Gill, Pennine 

 District. 



PEODUCTrs cf. MAXiMrs M'Coy.i (PI. LI, fig. 8.) 



This species resembles Pr. giganteus in general form, but differs 

 by its much smaller size, the full-grown specimens having a length 

 of about 10 cm. along the hinge-line. It differs also by the more 

 even character of the striae, and the absence of the large ribs 

 which are so characteristic of Martin's species. From Pr. corriigato- 

 hemispJiei'icus Yaughan it differs by its transverse form and its 

 elongated hinge-line. In the specimen figured there are also 

 closely-set spine-bases along the hinge-line. 



Horizon. — Characteristic of the Lower Dibunoj)^iy^Jum Sub-zone 

 in the North- Western Province. The specimen figured is from 

 this horizon in the Pennine District. 



Spirifee pinsketensis, sp. nov. (PI. LII, figs. 1 rt & 1 6.) 



Hinge-line straight, by far the greatest width of the shell. Beak 

 small and depressed. Yalves almost equally convex. 



Pedicle-valve. — Sinus shallow, with fiattened floor and three 

 or four ribs ; these may be faint and indistinguishable in the casts, 

 but are distinctly larger than those on the rest of the shell. Surface 

 ornamented with fine concentric lines and occasional indications 

 of radial strise on the ribs in the sinus. The ribs bounding the 

 sinus frequently bifurcate at some distance from the beak, and are 

 inclined to be raised above the general surface of the shell. 



Brachial valve. — Mesial fold flat, scarcely elevated above the 

 general surface of the shell, indistinct, usually divided near the 

 beak to form two ribs which diverge considerably towards the 

 anterior margin, each bifurcating once. The lateral ribs bordering 

 the fold are frequently seen to bifurcate. The anterior margin of 

 the fold is covered with conspicuous concentric growth-lines. 



Remarks. — This species bears considerable resemblance to 

 Sp. aff. clathraius (M'Coy) Vaughan.^ It differs from Dr. Yaughan's 

 figure of a typical specimen, given in vol. Ixi (1905) of this Journal,^ 

 by its rather less transverse form ; by the shallow and flattened 

 nature of the sinus; and by the less numerous and coarser character 

 of the ribs in the sinus. 



Horizon and locality. — Pinskey Beds, underlying the Shap 

 Conglomerate. Pinskey Gill, Eavenstonedale District. 



1 T. DaTidson, ' Brit. Foss. Bi-achiop.' Monogr. Pal. Soc. vol. ii (1858-63) 

 pi. xxxix. fig. 4. 



2 Proc. Bristol Nat. Soc. n. s. vol. x (1903) pp. 125-26 & pi. ii, fig. 3. 

 » P. 300 & pi. xxTi, fig. 5. 



