134 SPECIES OF THE SYSTEMA. 
I believe Linnzus meant for his A. hysterita, for it has been 
delineated by himself in the ‘Museum Tessinianum’ (pl. 5, f. A, 
1, 2, 3, 4), is the shell now known to belong to Orthis striatula 
(sinuata of Sch.), and has been figured by Baumer in 1763. 
The other is the cast of a Spirifer from the Rhine shales.” 
(Davidson and Salter MSS.) The doubtfully cited figure in 
Columna has been copied by both Klein (f. 75) and Lister (pl. 
453, f. 11). 
Anomta biloba. 
The fossil contained in the box thus marked in the Linnean 
cabinet alone of those present answers to the description in the 
‘Systema.’ Messrs. D. Sharpe, Davidson, Salter, and Searles 
Wood, who have examined the type, pronounce it to be the 
Spirifer sinuata of Sowerby (Sil. Syst. pl. 18, f. 10), and the 
Delthyris? cardiospermiformis of Dalman (Vet. Ac. Handl. pl. 
Sif 7). 
** In addition to the features detailed by Mr. Sowerby, it may 
be added that the striz are of unequal length, ten or twelve on 
each lobe, and crossed by a few concentric ridges. The smaller 
valve is truncated, and has no hinge area; the larger valve has 
a triangular area, with a triangular opening, and no deltidium. 
In our specimen the ears are partially rubbed off. 
“ Dalman has not improved the arrangement of the Brachio- 
podes by his division of the genus Spirifer. If we follow My. 
Morris in limiting the genus Delthyris to those species in 
which the hinge-line is interrupted by the apex of the smaller 
valve, which is in accordance with Dalman’s generic character 
‘Margo cardinalis transversus nate interruptus, we shall ob- 
tain a very natural group, of which the Terebratula psittacea is 
the recent type, and to Delthyris so limited the species under 
consideration does not belong: it, perhaps, deserves to be 
formed into a genus, but in the mean time must remain with 
Spirifer where Mr. Sowerby placed it, until this group of shells 
has been thoroughly examined and rearranged. The species 
has a wide geographical range, being found in Sweden, Ger- 
many, England, and New York: it appears to be limited to the 
