346 TESTACEOUS MOZ.LUSCA. 
* 
Sawicava Pholadis, p. 50, t. 9, f.5... S. Guerini, p. 51, t. 12, f. 2... 
: Carditoides, p. 51, t. 12, f. 53 ... S. Californica, p. 51, t. 12, 
wpa: 
On Perricoxas (p. 51). Sowerby, in his ‘ Thesaurus,’ has published 
a monograph of this genus. Our P. bidentata (p. 54) should be 
transferred to Montacuta, adopted and defined at p. 40. 
Petricola semilamellata, p. 52, t. 11, f. 41 ... P. striata, p. 52, 
t.11, £42 ... P. costellata, p. 52, t. 11, f..43 ... P. Roccellaria, 
p- 52, t. 11, f. 44 ... P. ruperella, p. 52, t. 11, f. 45 ... P. Pholadi- 
Jormis, p. 52, t. 13, f. 49 ... P. dactylus, p. 53, t. 13, f. 26. 
Venerupis exotica, p. 54, t. 9, f.29 ... V. crenata, p. 55, t. 12, f. 58 
- V. Lajonkairi, p. 55, t. 12, £55. Consult the monograph in 
Sow. Th. vol. 2. 
Sanguinolaria Nuttalii, p. 56, t. 12, f.56 ... S. Californiana, p. 56, 
t312; £517 0S; lividanp. 57; 41, £. 52, 
On Psammoraa and Psammosia. The former genus should be 
suppressed, since its members, when in perfect condition, exhibit a 
very different hinge from that assigned*to them in the definition. 
P. violacea, zonalis and rosea may be transferred to Psammobia, 
P. candida and P. Tarentina (the figure of the latter in Delessert is 
marvellously like Petricola ochroleuca, p. 52, a Tellina in our opinion, 
which must resume its Linnean name fragilis) to Tellina; P pellu- 
eida is the same as T’. lanceolata, p. 67, and P. Donacina (judging 
from the cited figure) seems a Donax. Psammobia Cayennensis, 
p- 58, is a true Tellina; Tellinides striata, p. 74, perchance, a Psam- 
mobia. For additional Psammobie consult Proc. Bost. vols. 2, 3, 
Zeit. Mal. 1846, 1848, Gray’s Appendix to Dieffenbach’s New Zealand, 
Philippi’s ‘ Abbildungen, &c. Conchylien,’ and, with great caution, 
Adams’s Jamaica Shells. 
Psammobia maculosa, p. 57, t. 11, f. 28... P. elongata, p. 57, t. 11, 
f. 46... P. squamosa, p. 57, t. 11, f. 47 ... P. Cayennensis, p. 58, 
t. 11; £.48.....P.Tellinella, p. 58,0: Wh 1d. so. Pi gnagues, p: 108, 
t. 11, £:49.....P.,Galatea, pi58; t13; 1)44..., Paelacea, p- 59} 
t.11, f. 20 ... Ps costata, p.\59, ti 11. £12 ....P.lineolata,, p: 59, 
t. 14, f. 1 ..° Ps Pacifica, p: 60) 12) ORF 
Galeomma Turtoni, p. 59, t. 9, f. 41... G. aurantium (as Psam- 
mobia a. p. 58), t. 9, f. 25. 
Psammotea violacea, p. 60, t. 12, f. 60... P. zonalis, p. 60, t. 11, 
f. 50... P. pellucida, p. 60, t. 14, f. 26... P. Tarentina, p, 60, t. 11, 
f. 56... P. Donacina, p. 60, t. 11, f. 57. 
On Tetiina (p. 61). The following less generally recognised 
Lamarckian species have been noticed or delineated in my monograph 
of the genus: 7’. crucigera (p. 61), f. 78, 79, 178; T’. rosea (p. 63), 
f. 218 (as Madagascariensis); T. elliptica (p. 63), as = acuta (p. 67); 
