A CARBONIFEROUS FAUNA FROM NOWAJA SEMLJA. 169 



Productus longispinus? (var. ?). (PL II. fig. 32.) 



A few specimens are characterised by their fine ribbing and very convex visceral 

 region. They resemble Productus spinosus J. Sowerby (Davidson, loc. cit., fig. 17), but 

 the materials are too fragmentary to enable one to make a decided statement as regards 

 their true affinities. 



Productus sp. indet. 



A fragmentary pedicle-valve, too incomplete for a detailed description, but belonging 

 probably to the semireticulati, is suggestive, in the general style of its sculpture, of the 

 form referred by Semenow and Moller to Productus carbonarius de Koninck.* It 

 may, however, well be that this is but an appearance due to the imperfect state of 

 preservation of the specimen. 



Productus cf. margaritaceus Phillips. (PI. II. fig. 29.) 



A pedicle-valve 10 mm. wide, and about 8 mm. long, is too small to permit of close 

 comparison with the figures of Productus margaritaceus given by Phillips and 

 Davidson, but on the other hand appears almost identical with the small form referred 

 to this species by Dr A. ToRNQUiST.t 



The Upper Carboniferous Productus parvulus Nikitin [non Winchell, 1863] J has 

 the same outline and ribbing, but differs from it in being more convex, with a broader 

 visceral region on which are spines, here, however, very scarce and restricted to the 

 cardinal slopes. 



Productus coatsi sp. nov. (PL II. figs. 35-35a.) 



This shell is longitudinally oval, and the hinge-line is a little shorter than the width 

 of the shell. The pedicle-valve is gibbous, without a sinus ; the ears are very small. 

 The beak is very prominent, and its extremity overlies the hinge-line. The brachial 

 valve is just perceptibly concave, so that there is a large space between it and the 

 pedicle-valve. 



The ornamentation of the pedicle- valve consists of tubercles which are very elongate 

 and rib-like on the mesial and frontal portions, and rounded on the ears and cardinal 

 slopes. The ornamentation of the brachial valve is very different, consisting of 

 rounded pits. 



The specimen figured is a slightly distorted pedicle-valve, measuring : — 



Length . . . . .12 mm. 



Width . . . . . 9 „ 



Depth . . . . . 5 ,, 



* Loc. cit., Bull. Acad. Imp. Sciences St Pe'tersbourg, 1863, p. 704, pi. iv. fig. B. 



t Das fossilfiihrende Untercarbon am ostlichen Rossbergmassiv in den Vogesen, 1895, pi. xiv. fig. 4. 



I Nikitin, Mem. Com. Ge'ol. Russie, vol. v., No. 5, 1890, pi. i. figs. 13-14. 



