103 



common at 110, 130, and 200 fathoms. They appear to live 

 at some greater depth, for the living example which formed 

 the Challenger type was taken at 415 fathoms. Considerable 

 variation from the type is seen. Its proportions are I'GT 

 inches long and '8 broad, but these may be 1*45 and '6, giving 

 a much more slender shell. Some individuals are more solid 

 than others, and these usually have bolder sculpture, in axial 

 cost^E and spiral lirae. This is very noticeable in the whorls 

 following the protoconch ; the first may be merely granulated, 

 and the second show only obsolete radial and spiral sculpture. 

 When there is any ornament it is seen as yellow-brown spiral 

 bands between the raised lirge, generally three in the spire- 

 whorls and about six on the body- whorl, the last two or three 

 tending to fuse. They are interrupted by the varices, which 

 remain white. 



Family SIPHONARIIDJE. 

 Genus Siphonaria, Sowerby, 1824. 

 S. diemenensis, Quoy A: Gaimard. 



S. diemenensis, Quoy & Gaimard, Voy. de rAstrolabe, Zool., 

 vol. ii., p. 327, pi. XXV., figs. 1-12, 1833; Reeve, Conch. Icon., vol. 

 ix., pi. i.. fig. 1, 1856; Ten. Woods. Proc. Roy. Soc. Tasmania, 

 1877, pp. 56 to 58; and 1878, p. 46; Adcock's HandHst of Aquatic 

 Moll, of South Australia, 1893, No. 457; Tate & Mav, Proc. Linn. 

 Soc. N.S. Wales, 1901, vol. xxvi., part 3, p. 418; Pritchard & Gat- 

 liff, Proc. Roy. Soc. Vict., 1903, vol. xv. (n.s.), part 3, p. 220. 



S. deniiculata, Quoy & Gaimard, op. cit., p. 340, pi. xxv., 

 figs. 19, 20; Reeve, op cit., pi. i., fig. 4; Ten. AVoods, 02). cit., 

 1877, p. 54, 56, and 1878, p. 47; Adcock, op. cit.. No. 454. 



S. scahra, Reeve. Conch. Icon., vol. ix., pi. i., fig. 2. 



Tj/j)e loc. — Of S. diemenensis, D'Entrecasteaux Channel, 

 Tasmania (Quoy) ; of S. denticulata, "The southern part of 

 New Holland at Western Port, and probably also at King 

 George's Sound" (Quoy) ; of S. scahra, Port Jackson (Reeve). 



O&.s.— Tate & May and Pritchard & Gatliff unite the 

 first two as one species, and the latter authors unite all three. 



Our shell is very variable. It may be high and steeply 

 conical, or so depressed as to have only a trace of cavity : 

 rarely thin and delicate, generally of moderate thickness, 

 sometimes quite solid. The ribs may be as few as 17 or very 

 numerous, distant, or crowded : high, narrow, and sharp-cut, 

 or low, broad, and rude ; straight, snlooth, and regular, or 

 crooked, rough, irregularly noded, or scabrous. Rarely they 

 are quite colourless, when taken alive : or yellowish, with 

 faint smokiness in the intercostal spaces. They are brown 

 throughout, or with bluish-white ribs and bluish-black be- 

 tween. But all these variations intergrade. It extends all 

 along our coastline. 



