8 
rather-distant ribs : mesial furrow or ridge not much larger 
than the adjoining folds: beak erect. It differs from 8. alatus 
in having only half the number of folds: the beak is less 
tumid and gibbous, and the lateral extremities are rounded 
instead of pointed. Humbleton and Tynemouth. 
Spirifer cristatus, Sehl. Not common. 
Spirifer multiplicatus, J. de C. Sow. In order to preserve 
Mr. Sowerby’s name, given to an undescribed species in Pro¬ 
fessor Sedgwick’s Paper, I make free to use it for a small 
Spirifer, resembling the last, but differing from it in having 
a narrower and a more elevated area, a more gibbous beak, a 
more rounded marginal outline, and less prominent folds. 
Not common. 
Alrypa pectinifera, J. de C. Sow. Humbleton and Tyne¬ 
mouth. 
Martinia Clannyana , n. sp. A minute species: as wide 
as long: nearly smooth : front slightly emarginate . deltidial 
valve very convex, with a slight mesial furrow: ventral valve 
nearly flat: area equilateral: deltiduim a little narrower than 
the area. This species closely resembles the Devonian 
Atrypa unguicula of J. de C. Sowerby. Ryhope Field 
House farm. 
Martinia Winchiana, n. sp. This, which is a small spe¬ 
cies, resembles Martina Clannyana in form, but both valves 
are crowded with short hair-like declined radiating spines. 
Whitley. 
Orthis pelargonata , Schl. Dalton-le-dale, Tunstall Hill, 
Humbleton, and Tynemouth. 
Productus horridus , J. Sow. This shell is extensively 
distributed : it occurs at Humbleton, Tunstall Hill, Dalton- 
le-dale, Whitley, Midderidge, Mill field quarry, Garmunds- 
way, and Tynemouth. 
Productus umbonillatus, n. sp. A scantily spinous, sub- 
triangular species, considerably less convex than P. horridus ; 
and, instead of the umbone being large and gibbous as in 
the latter, it is small, pointed, and without any incurvation. 
Tunstall Hill and Dalton-le-dale. 
