5A SPECIES OF THE SYSTEMA. 
actual examination of the Linnean cabinet, no soundly-based 
conclusion could possibly have been arrived at from such 
meagre data as those published. The logical conjecture, if I 
may so term it, of Philippi, who, in his valuable paper on the 
more ambiguous T'estacea of Linneeus, has referred the Cardiwm 
virgineum to Cyrena, and suggested the fluminea of Miiller for 
the species, is confirmed by the specimen, of which Philippi’s 
delineation in his ‘Neuer Conchylien’ (vol. ii. Cyr. pl. 1, f. 3) 
may be regarded as a fair portraiture. 
MACTRA. 
The genus Mactra had no place in the earlier editions of the 
‘Systema.’ Three of its species, corallina, stultorwum and 
solida were placed, in the tenth edition, with the Cardia, and 
one (lutraria) with Mya: the other four are additions. In the 
dismemberment of Cardiwm, the C. triste (ed. 10, No. 74) has 
been altogether passed over. 
Linneus had proposed to append the term “ lamellatis” to 
the published description of the lateral teeth. 
Mactva Sprenglert. 
Linneus was indebted to Spengler for very many of the 
additional shells which he published in the last edition of 
his great work. The name is generally misprinted throughout 
the ‘Systema,’ but in the present instance was corrected by 
our author in his revised copy. 
Notwithstanding that naturalists were unaided by any re- 
ference to an engraving, no serious difficulty seems to have 
been experienced in determining this scarce but well-known 
species (Sowerby, Genera Shells, Mact. f. 1), thanks probably 
