58 SPECIES OF THE SYSTEMA. 
Chama covdata. 
Our author has not indicated his possession of this species, 
which has never been positively identified by any succeeding 
writer. Gmelin, however, although unable to determine the 
typical form, has referred, I know not wherefore, the Cardita 
phrenetica to it, as a variety. Schréter, who confesses that he 
knows not the shell, has translated the details in the ‘Museum 
Ulrice’: in that book the characters are thus expressed :— 
“Testa ferruginea seu flavescens, superne (non vero versus 
marginem tenuiorem seu exteriorem) sulcis distinctis trans- 
versis obiusis equalibus. Angulus inter rimam et marginem 
exteriorem elongatus, magis fuscus lateribus angulatus. Rima 
exacte clausa cayitate ovato-lanceolata. Cardinis dens duplex 
compressus, retrorsum obliquus, exceptus a sinu.” 
The specimen in the Dronningen Museum here described 
was noted from the first as the type of the species, and the 
example still preserved in that collection must be examined 
in order to ascertain the modern name of this puzzling shell. 
It is difficult to conjecture even the modern genus in which it 
must be allocated, but the expression ‘‘ Rima exacte clausa 
cavitate ovato-lanceolata” renders it probable that there was no 
ligament ; if so, the gradual evanescence of the concentric sulci 
towards the margin, the ferruginous colouring, the produced 
and angulated anterior * extremity, and the lozenge with angu- 
lated sides, call up to one’s imagination a Crassatella, such a 
species as Kingicola. But this is mere surmise, though not 
wholly without foundation. 
Chama sattata. 
This species is erased in our author’s revised copy of his 
work, with the remark ‘“‘ eadem 167” (Arcinella). 
* In the Linnean sense. 
