OF CONCHOLOGY. 31 



Family SIPHONARIID^. 



Syn. Siphonariadce, Gray, Syn. Brit. Mus. 1840. Mrs. Gray's 



Moll. vol. iv, p. 181, 1859. Cpr. Maz. Shells, p. 181, 



1856. 

 Siphonaridce, D'Orb., Voy. Amer. Meridionale, 1841. 

 Siphonariidce, H. and A. Adams, Vol. ii, p. 270. Gen. Rec. 



Moll., Nov., 1855. Binney, L. and F. W. Sh. of N. 



Amer. ii, 152. Chenu. Man., vol. i, p. 485, 1859. 



Genus SIPHONARIA, Sby. 



Syn. Siphonaria, Sby., Genera of shells, part xxi, 1824. Proc. 



Zool. Soc, 1835, p. 6. Blainville, Diet. Sci. Nat. vol. 



xxxii, p. 267, 1825. Rajig, Man. des. Moll. p. 141, 1829. 



H. and A. Adams (as of Blainv.) Gen. Rec. Moll. vol. ii, 



p. 270. Woodw. Rec. 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. 



Lepas sp. [Le Mouret) Adans., Coq. du Senegal, p. 34, 1757. 

 Patella sp. various authors. 

 Nacella, sp., Cpr. 



Type Siphonaria sipho, Sby. China, Japan. 



The genus may be divided into two natural sections, as fol- 

 lows : 



A. [Siphonaria.) 



Shell solid, porcellanous ; apex central or sub-central ; pro- 

 vided with more or less elevated radiating ribs or ridges, which 

 by their projection render the margin irregular. In many of 

 the species the siphonal groove is produced internally beyond, or 

 passes around, the apex on the left side. In Quoy's figure of *S'. 

 diemenensis the gill is represented as passing before the heart. 

 The inner lateral teeth have a broad, somewhat oblique, cusp, 

 emarginate at the tip. (The outer laterals are also described as 

 similar by Woodward, but this does not agree with my observa- 

 tions.) The outer laterals are broad and tridentate. The cen- 

 tral tooth is slender with a lozenge-shaped cusp. The jaw is 

 simple and arcuated. This section of the genus is best typified 

 by S. gigas, Sby., and S. sipho, Sby. Most of the species are 

 tropical. 



