202 BRITISH SILURIAN BRACHIOPODA. 
shape and character. The beak and umbone are also smooth, the ribs not extending over 
those portions of the shell. Dr. Lindstrém places this species in the genus Strophomena 
on account of a slight resemblance he considers it to bear with Strophomena Loveni, but 
it must also be remembered that in the last-named shell the dorsal valve is essentially con- 
cave, although there may exist a small elevation in its middle and towards the front, but 
in C. nasuta this same valve is entirely convex, and much resembles that of many Spirifers. 
The name nasuta had also been given by Conrad and Emmons to a shell which Prof. 
Hall believes to be a synonym of Strophomena alternata ;' but as the species under de- 
scription cannot, | think, be considered as belonging to that genus, wherein the valves are 
always more or less concavo-convex, the name nasufa need not be changed. ‘The shape of 
the area, deltidium, and apicial foramen is, [ admit, very similar to what we find in certain 
species of Strophomena ; but it must also be remembered that in some species of Cyrtia 
there also exists a small circular foramen at the extremity of the deltidium, close to the 
extremity of the beak, as I have represented elsewhere in some Chinese examples of Cyrtia 
Murchisoniana. 1 do not, however, positively assert the place of this Spirifer-like shell to 
be that of the genus Cyrtia, but from its shape it was possibly provided with spirally coiled 
lamellae (as perhaps in Spirifer) for the support of the oral arms, an opinion also enter- 
tained by Prof. Hall. For the present, therefore, its family and generic position must be 
considered an open question, to be determined hereafter, when we are in possession of 
specimens exhibiting its internal arrangements. 
Position and Locality. Cyrtia nasuta occurs in the Wenlock Limestone of Dudley 
and of Benthall Edge, where it was collected by Mr. J. Gray and the Rev. H. Day: Mr. 
Gray’s specimens are now in the British Museum. Abroad it was first discovered by Dr. 
Lindstrém at Wisby and Faro, in Gothland. 
Atrypa? apicuLata, Salter and Forbes, (sp.), MS. Pl. XXV, fig. 6. 
RHYNCHONELLA apicuLata, Etheridge. A Catalogue of the Fossils in the Museum 
of Practical Geology, p. 7, 1865. 
Spec. Char. Shell small, obtusely triangular or somewhat pear-shaped, about as long 
as wide, broadest anteriorly, tapering posteriorly into a pointed beak ; hinge-line straight, 
less than half the width of the shell; sides rounded, front margin straight ; dorsal valve 
moderately convex, almost gibbous at the umbone; sinus wide, square, and shallow, com- 
mencing at the front and extending to about half the length of the valve. Ventral valve 
convex, deeper than the opposite one; beak produced, nearly straight, with a minute 
terminal foramen (?). Area triangular, about one third as high as long ; deltidium wide and 
flattened. A wide mesial rounded fold, commencing at a short distance from the extremity 
' Conrad, ‘Journ. Acad. Nat. Sciences,’ vol. viii, p. 260; also J. Hall, ‘Pal. New York,’ vol. i, 
p. 102. 
