15 
When the surface of this shell is deprived of its fringes, 
which it most commonly is, it appears to be concentrically 
striated : the even, very convex surface and pointed beak 
distinguish it from At. jimbriata , fig. 4. Abounds in the 
mountain limestone of Bolland ; the figured specimens are 
in Mr. Gilbertson’s Museum, except that with the fringes, 
which is from Ireland ; it is out of a small mass of lime- 
stone, to which the fringes adhere. 
A figure strongly resembling this shell accompanies a 
paper by M. Verneuil upon some interesting Brachiopods 
of the old formations (in the Bulletin de la Societe Geolo- 
gique de France , tom. xi. 259) ; but as he has referred it to 
Terebratula ( Atrpya ) Roissyi , it must be a different thing; 
the T. has the front elevated ; it is Spirifera globula- 
ris of Phillips. 
ATRYPA planosulcata. 
TAB. DCXVII.- fig. 2. 
Spec. Char. Pentahedral, rounded, depressed, the 
middle of each valve longitudinally planosulcate ; 
surface covered with broad wavy fringes. 
Syn. Spirifera planosulcata. Phill. loc . cit. 220. 
Pl. X.f. 15. 
A species well distinguished by its pentagonal form and 
waved fringes. The central figure represents a fragment 
of limestone, upon the surface of which is displayed one 
fringe nearly perfect, and portions of several others on the 
edge ; it is one of the most instructive specimens that en- 
rich Mr. Gilbertson’s collection, from which the other 
figures were also taken. It is also found in Ireland. 
