d19 TESTACEOUS MOLLUSGA. 
pressions ; cartilage-pit very small, about 12 angular teeth on each 
side of it. 1...%. Britain; N. Hurope. 
On 'Tricona (p. 172). See, likewise, 7’. wniophora of Gray in his 
Appendix to the Voyage of the ‘Fly,’ and the 7. Lamarckii (Gray) 
and Jukestt (Adams) of the Z. P. 1849. 
Castalia inflata, p. 1738, t. 24, f. 12. 
On Unto (p. 173). Since the publication of our monograph, Lea 
has issued a third edition of his Synopsis, which contains a list of 
numerous additional species. ‘These, for the most part, may be 
found in parts 3, 4, 5 of his ‘Observations upon Unio’ (extracted 
from vols. 8, 9, 10 (n.s.) of the ‘Transactions of the American 
see peciety ); in the Zeit. Mal. 1846, 1847, 1848, 1851, 
1852, Philippi’s ‘ Abbildungen,’ Chenu’s I. Couche DiOrbAswAms 
Mousson’s Java Shells, Bourguignat’s « Mollusques’ in Saulcy’s 
‘ Voyage autour de la Mer M orto. Proc. Philad. 1, 3, 4, 5, Mag. 
de Z. 1838, 1850, Morelet’s ‘'Testacea Novissima,’ J. Conch. 2, 4, 
Proc. Bost. 2, 8, Gray's Apx. to Dietfenb. N. Zealand, and Midden- 
dorff’s work on the Zoology of Siberia. 
Unio inflatus, p. 174, t. 21, f. 45 ... U. levissimus, p. 174, t. 21, 
4]... U. gracilis, p. 174, t. 20, f.37 ... U. compressus, p. 174, t. 20, 
39... U. Nicklinianus, p.175, t. 21, f. 52 ... U. celatus, p.175, t. 20, 
29 ... U. heros, p. 175, t. 22, f. 28 ... U. undulatus, p. 175, t. 20, 
26... U. plicatus, p. 175, t. 20, f. 21... U. trapezoides, p. 176, t. 22, 
29 ... U. foliatus, p. 176, t. 24, f. 1... U. pliciferus, p. 176, t..20, 
32... U. multistriatus, p. 176, t. 20, f. 385 ... U. subtentus, p. 176, 
t. 20, f. 34... U. Conradicus, p. 176, t. 28, f. 22... U. acutissimus, 
p. 177, t. 22, f. 35 ... U. Murchisonianus, p. 177, t. 31, f. 53 ... 
(OF a ae p- 177, t. 24, £5... U. lachrymosus, p. 177, t. 20, f. 38 
. U. asperrimus, p. 178, t. 21, 'f 12.....U. fragosus, p: 178,-t- 20; 
f. 40 ... U. pustulatus, p. ao t. 22, f. 86 ... U. aptculatus, p. 178, 
t. 28, f. 51... U. asper, p. 179, t. 22, £. 37)... U. Dorfeuillianus, 
p- 179, t. 23, f. 10... U. stapes, p. 179, t. 22, f. 38 ... U. metanever, 
p- 179, t.21, f. 31... U. cornutus, p.179, t. 20, f. 30... U. pustulosus, 
p- 180, t. 21, f. 34... U. turgidus, p. 180, t. 21, f. 51... U. verrucosus, 
p- 180, t. 21, f. 24... U. graniferus, p. 180, t. 28, f.11... U. irroratus, 
p- 181, t. 20, f. 25 ... U. dromas, p. 181, t. 23, f. 23 ... U. Aisopus, 
p- 181, t.24, £7... U. varicosus, p. 181, t. 21, f. 14... U. perpleaus, 
p- 181, t. 22, £39. U. granosus, p. 182, t. 28, f. 21 ... U. tuber- 
culatus, p. 182, t. 20, 2 27... U. cylindricus, p. 182, t. 20, f. 31... 
U, spinosus, p- 182, t. 23,f.56. ... U2 Leeat, p. 1825 t. 2351. 50) ee. 
U. arcajormis, p. 188, t. 22, f. 40 ... U. triangularis, p. 188, t. 21, 
£35 .(tlls sles p- 183, ..-t.721,. a 33 ... U. Donaciformis, p. 183, 
t. 22, f. 41 ... U. ziczac, p- 183, t. 22, f. 42 ... U. heterodon, p. 183, 
t 21, f. 42... U. secwris, p. 184, t. 20, f. 51... U. camelus, p. 184, 
