MAOTRA. 57 
in an unknown handwriting, and “corallina” in another, which 
has much the aspect of our author’s. It is not impossible, 
then, that this shell was the original of the corallina of the 
tenth edition, the name solidwm being reserved for the tri- 
angular form of that species. Plancus’s figure, which was not 
queried in that edition, is not so very unlike it: it was meant 
possibly, judging from the text, for Tellina nitida, but has 
been condemned as inaccurate by Plancus himself. 
SMactra stiltoriene. 
Two very nearly allied shells (perhaps, after all, only 
varieties) appear to have been included under this name. 
That of the tenth edition (of which a marked specimen, 
pl. 2, f. 8, still exists in the Linnean collection), where it 
first appeared under the name of Cardiwm stultorum, seems 
the M. inflata of Philippi’s ‘ Molluscorum Sicilie,’ of which 
the Mactra stultorum of the English shores seems an elongated 
form. The earlier description is very differently worded from 
the final one, and limits more particularly the colouring 
“ pallida, radiis obsoletis albis.” It contains many particulars 
not mentioned in the very succinct notice of its characters in 
the twelfth edition of the same work. The original account of 
its teeth was rendered unnecessary by the formation of a genus 
of whose dentition it may be regarded as the type, but the 
“subrotunda, equilatera—fragilis” were too important spe- 
cialities to have been so lightly passed over. ‘The reference 
to Gualtier, whose figure (pl. 71, f. C.) has much the appear- 
ance of this Mactra, was likewise omitted. In leu of these 
expressions, we find “ subdiaphana—intus purpurascente, vulva 
gibba.” The latter characteristic is worthy of note, being 
indicated as one of the chief distinguishing features of 
the Mactra stultorum of Philippi from its most closely 
allied congener J. inflata. It is most probable, then, that 
the former of these two was intended in the twelfth edition ; 
though it must be confessed that the tumidity of the part 
here termed the “vulva” is also occasionally apparent in 
inflata. 
