ARCA. 99 
general appearance and variegated painting of glycimeris, but is 
scarcely accurate enough for positive identification; pl. 82, 
C, D, of the same work, was possibly meant for P. violascens, 
yet, if so, is an execrable representation of it. The enlarged 
account of the species in the ‘Museum Ulrice,’ where the 
colouring is described as ‘“‘maculis flavescentibus fere fasci- 
atis,” is admitted to be confirmatory of the identification, and 
assuredly does not favour the supposition that either P. vio- 
lascens or P. Siculus (the Lamarckian ideal of the Linnean 
Species) was the original of it. 
The additional engravings referred to in the synonymy of the 
twelfth edition are unworthy of being quoted, yet Bonanni, and 
Adanson (in his description) confirm the idea of the flammulated 
style of painting, which forms so special a feature in our indi- 
genous species. 
Arca ptlosa, 
No doubt exists of the identity of this Ark with the Pectun- 
culus pilosus of the Mediterranean, since the latter is clearly 
pointed out both by the description and by the cited engravings. 
Upon a magnificent example (fairly enough represented as to 
size, colouring and epidermis in Chemnitz, vol. vu. pl. 57, £.565, 
yet slightly more orbicular in shape, as delineated in the Ency- 
clopédie Méthodique, Vers, pl. 310, f. 2), of that shell, in the 
collection of our author, he has written “ Bonan. recr. f. 80,” 
and since that very figure was cited by Linneus as illustrative, 
and as the name there mentioned “nux pilosa” was the origin 
of the specific appellation, the inscription may be fairly regarded 
as equivalent to the numerals 182 (the number of A. pilosa in 
the twelfth edition of the ‘Systema,’ where it first appeared in 
print). 
Linneus in his own copy has changed “pilosa” of the 
diagnosis into “limbo piloso”: ‘“ excludi vult Soland. (er.)” is 
written in the copy of the younger Linné. 
The difference between this and the preceding shell is now 
generally held to be of varietal rather than of specific im- 
portance. By those who hold this opinion the name glycimeris 
