Mul.I.lXA. 63 



65. Rissoina curtisi. (Plate V. fig. .M.i 



Shell elongate, thick, white, very coarsely cancellated. Number 

 of whorls unknown, the apex being broken off; the remaining four 

 are obliquely sloping at the upper part, and, with the exception of 

 the last, biangulaled at the sides, the angles being caused by the 

 prominence of two spiral line upon the longitudinal costae. A third 

 lira is seen at the base of the whorls at the suture. The costae are 

 about fourteen on a -whorl, about as thick as the transverse ridges, 

 and nodulous at the points of intersection. The body-whorl has 

 five spiral lira>, the lowermost being separated from those above by 

 a broad smooth furrow, in which the costae are almost obsolete. 

 Aperture obliquely subovate, rather widely channelled in front. 

 Columella oblique, covered with a thin callosity, which at the base 

 forms the sinistral side of the canal. Labrum much thickened ex- 

 teriorly, acute at the margin, and (viewed laterally) is produced to 

 the left at the front part. 



Probable length about 7 millim. ; actual length of remaining four 

 whorls oh millim., width 2^. 



J lab. Port Curtis, 7 fms. 



This species might be considered a dwarfed, strongly cancellated 

 form of 11. claihrata ; it is less slender, has fewer and stouter costae, 

 and the spiral lira? are also thicker and two in number upon the 

 upper whorls exclusive of those at the suture, whilst in the species 

 referred to there are three. The outer lip is much thickened and 

 the aperture rather more contracted. 



G6. Cerithiurn morus. 



Lamarck, Anim. sans Vert, ed. 2, vol. ix. p. 302 ; Kiener, Coq. Viv. 



p. 52, pi. 15. rig. 1 ; Sowerby, T/tes. Conch, rigs. 159-161 ; id. Conch. 



Icon. fig. 42. 

 Var. = Cerithiurn moniliferum, Dafresne, Kiener. Coq. Viv. p. 49, 



pi. 16. fig. 3; Sowerby, Thes. figs.'l63, 165 ; id. Conch. Ic. rig. 20. 

 Var. = Cerithiurn carbonarium, Soicerby (non Philippi), Conch. Icon. 



tig. 59. 



Hah. Philippine Islands (Cuming) ; Samoa Islands (Rev. S. J. 

 Whitmee in Brit. Mus.) ; Port Jackson, 7 fms. ; Friday Island, 

 Boko Island, Endeavour Strait, and West Island, Prince of Wales 

 Channel, Torres Straits (Goppinger) ; Dungeness Island, Torres 

 Straits (Brazier) ; Hall Sound, Xew Guinea (Brazier). 



The small group of species to which C. moras belongs, including 

 C. tuberculatum of Linnaeus as defined by Hanley ("Ipsa Linnaei 

 Conchylia,' p. 270, pi. iv. fig. 4), G. lemniscatum, C. breve, and C. 

 variegatum, Quoy and Gaimard, G. petrosum and G. rugosum of 

 Wood (non Lamarck) = C.patiens, Bayle, C. moniliferum, Kiener, G. 

 gemma, G. purpurascens, C. bifasciatam, C. pupa, and C. nigro- 

 fasciatum of Sowerby, is very perplexing, owing to the great simi- 

 larity in sculpture of the various species. 



1. G. tuberculatum, to which I unite as varieties C. variegation, 



