GASTEROPODA. 359 
AnimaL bright yellow above, finely dotted with bronze-green near 
the shell; beneath, the locomotive disk and head are bright yellow, the 
mantle deep green, passing into yellow towards its edge. Head trans- 
verse, not emarginate in front ; eyes distinct, widely separated. 
SHELL small, solid, very irregular in all its outlines, very inequi- 
lateral, moderately elevated, the apex nearly median, with about 
twenty to twenty-four rather large, unequal ribs. Exterior eroded 
and covered with an ashy deposit. Aperture somewhat semicircular, 
the siphonal edge being rounded, and the opposite one being nearly 
straight. Cavity rather deep, the wall on the right side being pre- 
cipitous, while on the siphonal side it is gradually sloping; fundus 
with a thick callus, black or mottled with brown; muscular cicatrix 
very strongly marked; marginal limb expanded, liver-coloured, with 
a silky lustre, edge denticulated and tipped with yellowish. 
Length seven-tenths of an inch; width seven-twentieths of an inch; 
height one-fourth of an inch. 
Inhabits New Zealand. 
Differs from S. cornuta in being smaller, less depressed, with more 
numerous, smaller, and less angular ribs, and by its coloration. Its 
cavity is deeper, but in respect to the straight, abrupt wall of callus on 
the one side and gentle slope on the other, it is similar. It may be 
known by its rude aspect, and its liver-brown interior margin. 
Figure 465, exterior of the shell; 4654, profile view of the shell, 
and animal ; 465 4, locomotive disk of the animal. 
SIPHONARIA NORMALIS (Gould). 
Testa parva, tenuis, symmetrica, bast rotundata, elevato-conica, Susco- 
cinerea, creberrimeé costato-striata, strtis subequalibus: subtus fundo 
castaneo, limbo marginali mustelino; cicatrice bene impressa; labio 
acuto, ad canalem stphonalem angulato, albido lineolato. 
Siphonaria normalis, Goutp; Proceed. Boston Soc. Nat. Hist., ii. 
154. August 1846. Expedition Shells, 12. 
