Om Skånes brachiopodskiffer 
this varying species given by Baeeande (1879, pi. 56, fig. 33 — 36), It has perhaps 
often been confused with Plectambonites 5-cost ata M’Coy which according to. M’Coy 
(1852, p. 236 — 237) differs highly as to the interior of the ventral valve. 
Hyattella Törnquisti n. sp. 
Pi. I, f. 10—12. 
The shells, being rarely preserved, are fairly well convex, most near the 
umbo. The anterior part of the ventral valve in conformity to the rather flattened 
sides shows a faint concentric striation. The prominent beak is incurved beyond 
the hinge-line and conceals it. A median, well defined sinus extends increasing 
in width from near the beak to the anterior margin, occupying a fourth of the 
width of the valve; some individuals possess a faint median ridge in it. Of the 
dorsal valve only fragments are known. The figured specimen, an external cast 
of a somewhat compressed valve, is faintly concentrically striated and shows a 
longitudinal median fold answering to the sinus of the ventral valve and extending 
over the whole of the valve. Length and width are in general 3 — 4 mm. — Best 
preserved are casts of the interior of the ventral valve where the sinus is still 
more marked, The umbonal cavity is deep, on each side bounded by a strong 
dental lamella and provided with distinct muscular impressions, namely a single or 
double median linear adductor scar and on each side of it a strong diductor pas- 
sing into the bounding folds of the sinus. 
From H. congesta Billings and H. portlockicma Dav. this species differs by 
its less dimensions, the less convexity of the shell, the well defined sinus, the 
ornamentation and the more rounded anterior margin. 
The undescribed species Daya pentagona Töenqctist mscr. (Stolley 1895, 
p. 56) from the Leptaena limestone of Dalarna agrees in every respect with the 
diagnosis of the genus Hyattella Hall & Clabke judging from its external appe- 
arence. It is larger than the Scanian species and more convex, devoid of striation, 
but agrees with it in having a well defined sinus with the thin median ridge. 
Length 8 mm., width 7,5 mm. 
Gastropoda. 
Bellerophon (Sinuitopsis ?) consobrinus n. sp. 
Pi. I, f. 13— If. 
Disciform, bellerophontid shell with large umbilicus. Only fragmentary casts 
have been met with. Their whorls are keeled and marked with a close transverse 
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