Bracuropopa. | UPPER PALAOZOIC MOLLUSCA. 409 
SEMINULA ELONGATA (Schlot. Sp.) 
Ref. and Syn. = Terebratulites elongatus + T. complanatus + T. latus Schlot. Akad. Miinch. Vol. VI. t. We 
8, 9,12, 13, 14+ 7. Qualeni (Fisch.) Kutorga, Verhand. der Min. Gesellschaft zu St Petersburg, t. 6. 
= Epithyris elongata King, Perm. Foss. t. 6. f. 30 to 45. 
Desc.—Longitudinally ovato-pentagonal, attenuated posteriorly; greatest width at a line varying from 
a little in front of the middle of the length, to two-fifths of the length from the anterior end; anterior lateral 
margins slightly convex; front sub-truncate, slightly convex ; posterior lateral margins more nearly straight, 
converging to the large, wide, prominent beak of the receiving valve. Receiving valve flattened ; profile gradually 
arched towards the front margin, more abruptly curved towards the apex of the beak, so that the greatest depth 
would be at one-third the length from the beak; rostral portion, and a narrow portion of the sides, slightly 
convex ; the middle depressed by a very wide, shallow, mesial hollow, extending to within two lines of the beak, 
and occupying the entire width of the front, which is raised thereby into a wide rounded wave towards the 
entering valve, deepest in old shells; sides of the beak obtusely subangulated, the apex truncated by the large 
foramen ; the large bounding dental lamell scarcely one-sixth the length of the shell, and diverging at about 
30°; entering valve with the mesial third, prominent, slightly convex, the lateral portions sloping rapidly to the 
sides, which are thus rendered acute : surface with moderately coarse, close punctures under the lens. Average 
length of receiving valve seven lines, proportional length of entering valve 3, width % to &, greatest depth of 
both valves (at one third from the beak) 34. 
Professor King, in the above-cited work, has figured the perfect loop of this species, as well as an 
instructive series of the principal varieties of form. I entirely agree with him in thinking they are all of 
one species. 
Position and Locality—Common in the magnesian limestone of Humbleton. 
16! 
f, 2. 
SEMINULA Ficus (M‘°Coy). Pl. 3. D. fig. 22. 
Ref —M°Coy, Ann. Nat. Hist. 2nd Series, Vol. X. 
Desc.—Longitudinally broad-ovate, gibbous ; greatest width slightly in front of the middle ; lateral margins 
slightly raised into a tri-undate, wide, flattened wave, towards the entering valve in old specimens (lines of 
growth indicating a regular margin up to one inch long) ; no distinct ridge extends from this wave towards the 
beak of the entering valve, but the surface near the front slopes more rapidly away from it towards the lateral 
edges; on the receiving valve obscure indications of the mesial hollow and bounding ridges extend a short 
way towards the beak in specimens an inch and half long ; receiving valve evenly tumid, regularly arched from 
the beak to the front margin; greatest depth about the middle; beak moderate, obtuse, lateral angulation 
nearly obsolete ; perforation large ; surface closely granulo-punctate under the lens; dental lamellee at sides of 
foramen large, diverging at 45°. Length one inch six lines, proportional length of entering valve °°, width ©, 
depth of receiving valve ;, depth of entering valve =. 
The broad-ovate, tumid form distinguishes this easily from the other carboniferous species, as well as the 
absence of any distinct mesial hollow or emargination of the front in either valve. The punctures of the 
surface are considerably smaller than those of the S. virgoides (M*Coy) or S. hastata. 
Position and Locality—Rare in the carboniferous limestone of Derbyshire. 
Explanation of Figures.—P1. 3. D. fig. 22, natural size, profile; fig. 22a, do. view of entering valve ; fig. 
226, end view shewing the undulation of the front margin ; fig. 22c, do. punctured surface, magnified, 
SEMINULA HASTATA (Sow. Sp.) 
Ref. and Syn. = Terebratula hastata Sow. Min. Con. t. 446. f. 2, 3. 
Desc.—Longitudinally ovate, depressed when young, obscurely pentagonal after an inch long, from the 
gradual straightening of the lateral anterior margins, and the front becoming gradually truncated, or concave in 
3 G2 
