120 SPECIES OF THE SYSTEMA. 
“ Terebratula costata. Nilsson, Petref. Suec. pl. 3, f. 13; 
Dalman, Vet. Acad. Handl. 1827, p. 186; Hisinger, Lethea 
Suecica, pl. 22, f. 8. 
“The Swedish naturalists consider their 7’. costata identical 
with the JT. lyra of the ‘Mineral Conchology’ (pl. 138), from 
which the Linnean specimens differ materially; the ribs on 
both valves are stronger and sharper in the 7’. pectinata than in 
T. lyra, and the concentric ridges are also more marked. ‘The 
larger valve being broken in all the specimens, we cannot com- 
pare the form of the beak, but in the smaller valve, which is 
perfect, there is a marked difference in greater flatness, and 
in the straightness of the hinge-line, which in one example is 
produced into an angle on one side. Both species are variable 
in general form and in the ribbing. 
“ The cardinal apophysis on the smaller valve of this species 
is very peculiar, being perforated by two pores, which probably 
allowed of the passage of a pair of ligaments, which appear to 
have run through the side pores of the beak of the larger 
valve: the beak of the larger valve of JT’. lyra has these pores, — 
and this species has probably the same; that is, a pore on 
each side of the perforation, which is general in the genus. 
“Nilsson states-that all the Swedish specimens he has seen 
have the large valve broken in the manner we find Linneus’s 
specimen imperfect. The species is common in the chalk 
formation of Sweden. Nilsson quotes the 7’. lyra as a sy- 
nonym with some doubt: Hisinger gives it as certain.” 
Messrs. Davidson and Salter, likewise, have recognised the 
specimens as T’. costata. 
; Aronia ephipptunr. 
The Anomia ephippium of authors (Mawe, Conch. pl. 15, f. 6) 
remains in the box thus marked in the Linnean cabinet. The 
synonymy being correct, and the shell abundant, the species 
was readily determined from the first. As both America and 
the Mediterranean are assigned as localities, and the American 
form is considered by some conchologists as a distinct species, 
it is as well to remark that the shells delineated by Bonanni 
