82 
NATJTILOIDEA. 
Horizon. Woolhope Limestone. 
Locality. Hay-Lead, East of Walsall, Staffordshire. 
Represented in the Collection by a single example. 
Trochoceras striatum, Blake. 
1882. Trochoceras striatum, Blake, British Foss. Ceph. pt. i, p. 222, 
pi. xxix. f. 5, pi. XXX. ff. 3, 4, 4 a, 4 h. 
Sp. Char. The shell increases its diameter about twice in the last 
whorl. “ The want of symmetry is very slight. The section is 
uniformly rounded, but rather flattened. The body-chamber con- 
tinues the same curve as the earlier portion. The ornaments are 
33, almost obsolete, rounded, subseparate ribs, curving very rapidly 
backwards, and these die away on the body-chamber, lea^dng only 
lines of growth. The septa are 24 per whorl, and the sutures are 
somewhat sigmoid, commencing by being slightly convex towards 
the aperture, on the inner edge. There are some bulbous-looking 
bodies on the circumference which may represent an external beaded 
siphuncle. Diameter 3 inches. . . „ Other examples confirm the 
great rapidity of growth [i. e. rate of increase], and the breadth of 
the outer whorl. The thickness is about J the breadth, and in 
some there are very good indications of asymmetry. The body- 
chamber is not longer than its basal diameter, and the aperture is 
formed of a gentle sigmoid backward tending curve parallel to the 
lines of growth, about 4 the diameter apart. . . . The shell, when 
well preserved, is covered by fine lines parallel to the ribs, which 
are most conspicuous towards the convex border, while epidermids 
cover the region near the concave border. The septa are pretty 
uniformly concave ; except near the inner border, their transverse 
convexity is slight ; and their number pretty constant at 24 per 
whorl. The siphuncle is not certainly determined.” {BlaTce.) 
Remarks. The specimen in the Collection which I have referred 
to the present species is badly preserved, but the wide septa and 
the ornaments (of which fragments are seen) are so characteristic 
of Blake’s species that I have very little hesitation in identifying it 
therewith. 
Horizon. Wenlock Shales. 
Locality. Dudley ?, Garcoed, Usk, Monmouthshire. 
Represented in the Collection bj’ two examples, one of which 
(No. C. 2017) was presented by J. E. Lee, Esq., E.G.S. 
