﻿Vol. 6 1.] OF THE MARINE BANDS IN THE COAL-MEASUEES. 531 



Productus scabkicultts (Martin). 



A crushed example of what I take to be this species is found in 

 the marine band, 71 feet below the Four-Feet Coal of Cheadle. It is 

 not surprising that this species should occur at this horizon, for it is 

 common in the Pennystone Ironstone of Coalbrookdale, and is also 

 known in the bed 500 feet below the Millstone Grit at Congleton 

 Edge. Jukes reports this species, on the authority of Edward Forbes, 

 from the Pennystone Series of South Staffordshire, and it also occurs 

 60 feet above the Thick Coal, at Hamstead Colliery. 



Productus sp. (PL XXXV, fig. 5.) 



Several imperfect and immature examples of a scabriculocostate 

 Productus have been obtained ; these had been previously assigned 

 to Pr. semireticalatus, a form which must be rigidly denned in the 

 near future. 



Productus anthrax, sp. nov. (PI. XXXV, fig. 6.) 



Dr. Arthur Yaughan, F.G.S., has kindly studied this form, and I 

 append his remarks as follows : — 



' Productus ft. (Gin Mine). (A pedicle-valve.) 



' I. A descendant of the generic series of Productus Cora (Dav), as shown by 



(1) The short hinge-line (see the growth-lines on the brachial valve). 



(2) The Ortkotetes-like sculpture on the flanks. 



(3) The emphasized wrinkles on the wings. 



4 II. Strong convergence towards Productus kemisphcsricus is indicated by 



(1) The transversity and general convexity, but especially by the 



form and ornament of the beak and beak-region. 



(2) The gradual and gentle slope of the medial area into the 



flanks. 



■* III. Homceomorphy with Productus aff. burlingtonensis (=my Productus cf. 

 Martini) is distinctly suggested in the general aspect of the medial area. 



(1) The medial line has an almost constant curvature. 



(2) The medial area is flattened transversely, so as to be almost 



truly cylindrical. 

 (The broad, very shallow sulcus and the few distant spines 

 increase the resemblance.) 



* IV. The edelburgensis-tyipe of ribbing is very marked in this specimen, 

 but is most probably (judging from other groups) merely a varietal 

 character.' 



Locality. — North-Staffordshire Coalfield: below the Gin-Mine 

 Coal. 



Amboccelia carbonaria, sp. nov. (PI. XXXV, figs. 7 & 7 a.) 



Specific characters. — Shell small, pedicle-valve elongate, 

 tumid, with a broad, shallow, median furrow extending from the 

 beaks. The beak is pointed and much curved. The brachial valve 

 is much flatter, transverse, with a median, broad, shallow sulcus and a 

 compressed zone near the front p.irt of each lateral margin. The 

 valves are almost smooth, the brachial showing distinct lines of 

 growth. 



2 r 2 



