56 SPECIES OF THE SYSTEMA. 
{Mactra glabrata. 
The Mactra Lisor (Hanley, Recent Shells, Sup. pl. 11, f. 
54, 55) still remains in the marked receptacle of M. glabrata in 
the Linnean cabinet, and admirably agrees with the description 
of that species. The Cardium triste of the ‘Museum Ulrice,’ 
altogether omitted in the last edition of the ‘Systema,’ may 
possibly have been identical. 
silactva covallina. 
The name corallina was derived from the “ Concha corallina 
dicta” of Bonanni, whose figure (2, t. 53), possibly meant for 
a Terebratula, was thus cited in the tenth edition of the 
‘Systema’ (perhaps instead of 2, t. 52, which more resembles 
the other synonyms, but seems meant for Scrobicularia pipe- 
rata). These numerals, by a typographical blunder, became 
changed to “38.¢. 5—2” in the twelfth edition, and in the 
Vienna reprint to “3. t. 2—5.” The species is altogether too 
succinctly described for certain recognition, and the synonymy 
is most incongruous. A portion, “antice posticeque obtusis- 
sima,” of its original description in the tenth edition, where it 
is located next to solidwm, is omitted in the twelfth edition, 
where it is placed next to stultorum. Spengler has cited the 
figures 220, 221 (M. lactea) of Chemnitz’s sixth volume for the 
Linnean corallina; and, in truth, the shell there delineated, 
which is common at Algiers, and is closely allied to, if not a 
white variety of, the inflata of Philippi, bears so much resem- 
blance to the quoted engravings of Gualtier and Rondelet, that 
I entertain but little doubt of its being the amended species of 
the twelfth edition. Chemnitz himself, however (Conch. Cab. 
vol. vi. pl. 22, f. 218, 219), has selected a different (Guinea) 
species for his ideal; his views are followed by Gmelin and 
Schréter. ‘There exists a small specimen of the elliptic 
variety of Mactra solida in the Linnean collection, wrapped in 
a paper on which is written (and then crossed) “ nondescripta,” 
