STRICKLANDINIA. 125 
Remarks.—This curious little fossil is very distinct from any other British 
Devonian Brachiopod [ have seen. I am very doubtful about its true position. 
Its bad state of preservation renders its characters obscure. In many features it 
bears decided likeness to Skenidiwm areola, but its resemblance to the American 
fossil described by Ulrich as Gypidia unguiformis* is so great as to suggest that it 
is allied to that species, though differing in several points, e.g. in having much 
more numerous ribs, a sharper and rather less elevated beak, and longitudinal 
ribs on the sides of the beak. In the same particulars it differs from Conchidium 
biloculare, Linné,’ the type of Linné’s genus, and still more so from Pentamerus 
Knightii, Sowerby. Even if this be so, it is still questionable what generic name it 
should bear. Ulrich remarks of his shell and Gypidia conchidiwm, Dalman, that both 
differ from Pentamerus proper in having the beak much more extended and slightly 
arcuate, and the septum of the dorsal valve separate. These points are also more 
or less to be observed in P. Knightit. On the other hand, Ghlert gives Penta- 
merus and Gypidia as synonyms of Conchidiwm. To follow him would be to sink 
the well-known name Pentamerus ; and it certainly seems to me that these shells 
could hardly be included in the same category as P. brevirostris, &c. I should 
therefore be inclined to retain Conchidium for this group (perhaps including with 
them P. Knightii), and Pentamerus for the more ordinary forms. Should the 
distinction between them not be more than subgeneric, Dalman’s and Sowerby’s 
names might be taken as subgeneric terms under Linné’s genus. 
3. Genus.—Srricktanvinia, Billings, 1863. 
1. Srricktanpinia? sp. Pl. XVII, fig. 9. 
Description.—Dorsal valve small, slightly convex, with an elevated angular 
mesial fold. Beak of dorsal valve minute; hinge-margin wide, nearly straight. 
Surface marked with numerous elevated ribs, about thirteen of which start from 
the hinge-line, each of which divaricates again and again as they approach the 
front, remaining the same size throughout; the central rib at the umbo thus 
dividing into about eight ribs which cover the fold. 
Swe of dorsal valve : about 12 mm. long and 13 mm. wide. 
Locality.—A single fragmentary specimen is in my Collection from Lummaton. 
Remarks.—The ornament on this fossil is very peculiar, and different from any 
other British Devonian shell known to me. Unfortunately my only specimen is so 
1 1886, Ulrich, ‘ Contrib. American Paleont.,’ vol. i, p. 28, pl. ili, figs. 2—2 b. 
? 1887, Fischer, ‘ Manuel Conchyl.,’ p. 1311, fig. 1007 
