OF CONCHOLOGY. 
31 
Family SIPHONARIIDtE. 
Syn. Siphonariadce, Gray, Syn. Brit. Mus. 1840. Mrs. Gray’s 
Moli. voi. iv, p. 181, 1859. Cpr. Maz. Shells, p. 181, 
1856. 
Siphonaridce, D’Orb., Voy. Amer. Meridionale, 1841. 
Siphonariidce, H. and A. Adams, Voi. ii, p. 270. Gen. Ree. 
Moli., Nov., 1855. Binney, L. and F. W. Sh. of N. 
Amer. ii, 152. Chenu. Man., voi. i, p. 485, 1859. 
Genus SIPHONAEIA, Sby. 
Syn. Siphonaria, Sby., Genera of shells, pari; xxi, 1824. Proc. 
Zool. Soc., 1835, p. 6. Blainville, Dict. Sci. Nat. voi. 
xxxii, p. 267, 1825. Rang, Man. des. Moli. p. 141, 1829. 
H. and A. Adams (as of Blainv.) Gen. Ree. Moli. voi. ii, 
p. 270. Woodw. Ree. and Foss. Shells, pp. 155 and 174. 
Hanley P. Z. S., 1858. 
Muretia, D’Orb., (as of Sby.) Voy. Amer. Meridion. p. 682, 
1841. 
Trimusculus, Schmidt., MSS., 1832. Isis, p. 132. 
Liria, Gray, MSS. Phil. Mag., 1824. 
Lepass^. [Le Mouret) Adans., Coq. du Senegai, p. 34, 1757. 
Patella sp. various authors. 
Nacella, sp., Cpr. 
Type Siphonaria sipho, Sby. China, Japan. 
The genus may be divide! into two naturai sections, as fol- 
lows : 
A. {Siphonaria.) 
Shell solid, porcellanous ; apex centrai or sub-central ; pro- 
vided with more or less elevate! radiating ribs or ridges, which 
by their projection render thè margin irregular. In many of 
thè species thè siphonal groove is produce! internally beyond, or 
passes around, thè apex on thè left side. In Quoy’s figure of S. 
diemenensis thè gill is represented as passing before thè heart. 
The inner lateral teeth bave a broad, somewhat oblique, cusp, 
emarginate at thè tip. (The outer laterals are also described as 
similar by Woodward, but this does not agree with my observa- 
tions.) The outer lateràls are broad and tridentate. The cen- 
trai tooth is slender with a lozenge-shaped cusp. The jaw is 
simple and arcuate!. This section of thè genus is best typified 
by S. gigas, Sby., and S. sipho, Sby. Most of thè species are 
tropical. 
