F. R. Coivper Reed — The Bohkeveld Beds, S. Africa. 305 



Locality. — Zwartberg Pass. 



Remarks. — The true generic position of this shell appears to be in 

 Sanguinolites, following Wheelton Hind's definition.' In shape and 

 general characters our species seems to resemble Oehlert's S. Marsi,'^ 

 but probably it belongs to a new and undescribed species which may 

 be termed niger. I do not think any of the Brazilian or Bolivian 

 forms which Clarke and Ulrich have described and figured come 

 very near it. 



Sanguinolites (?) aoek, sp. nov. (PI. XVI, Figs. 5, 5a, 56.) 



There is another internal cast from Zwartberg Pass which may 

 represent a species of Sanguinolites, but its generic position is 

 somewhat doubtful. 



Shell elongated oval, twice as long as high ; valves strongly 

 convex, most so in anterior two-thirds of shell, posteriorly being 

 somewhat compressed. Anterior end rounded, slightly narrower 

 than posterior end, which is obliquely truncated. Hinge-line 

 gently arched ; inferior margin nearly straight, a little concave 

 towards middle. Beaks broad, obtuse, low, situated at about one- 

 fourth the length of the shell from anterior end ; obscurely defined, 

 transversely oval lunule in front. Umbonal ridge moderately 

 strong, running from beak to postero-inferior angle, with shallow, 

 undefined, weak depression in front of it reaching sinuation of 

 inferior margin, and a narrow, more defined sulcus behind it 

 running nearly straight back to posterior angle. Anterior adductor 

 scars deep, subtriangular, strongly ridged, situated close to anterior 

 margin and about half-way between beak and anterior inferior angle. 

 Pallial line simple, and at about one-fourth the height of the shell. 

 Posterior adductor scars not visible. Margins of valves between 

 beaks and on anterior end thickened internally and rounded; on 

 umbonal hinge-plate thus formed is a short longitudinal furrow 

 parallel to hinge-line and followed by two or three more or less 

 fused pits. Surface of shell ornamented with rather coarse, raised, 

 concentric ridges swelling out into small irregularly spaced nodules 

 (observed on one fragment of shell adhering to the cast) . 



Dimensions : 



Length 33-5 mm. 



Height 16-5 ,, 



Thickness 15-0 „ 



Locality. — Zwartberg Pass. 



BemarTcs. — It does not seem possible to determine with certainty 

 the genus of this shell. The ridges and grooves on the surface and 

 the ornamentation suggest Grammy sia ; the internal grooves and 

 pits on the hinge-plate are indistinctly seen, but seem to point to 

 the presence of an internal ligament. The general shape, however, 

 more resembles members of Sanguinolites, and for the present it may 

 be left in this genus. 



' Wheelton Hind: Mon. Brit. Garb. Lamell., vol. i, pt. 5 (1900), p. 361. 



2 Oehlert: Bull. Soc. Geol. France, ser. in, vol. xvi (1888), p. 658, pi. xv, fig. 4. 



DECADE v.— VOL. III. — NO. VII. 20 



