Septa.] GASTROPODA. 305 



Dentition. Troschel, Das Gebiss d. Scbnecken, pi. 19, f. 12, a,b,c; 

 Man. Conch. (1), iii, pi. 2, f. 4. 



Hob. Cape Maria van Diemen (Dr. Dieft'enbach) ; Ahipara Bay, 

 thrown up after gales. Indo-Paciric and Atlantic regions. 



Subgen. 1. LAMPUSIA, Schumacher, 1817. 



Lampusia, Schumacher, Essai d'tin Nouv. Syst., &c., 1817, 250. Type: 

 Murex pilearis, L. Simpulum, Klein, 1753, in Morch, 1852 ; not of 

 Fabricius, 1822. 



Shell fusiform, large and solid, nodosely ribbed ; aperture ovate, 

 more or less distinctly channelled above, with a somewhat elongated 

 canal ; outer lip thick, varicose, plicate-dentate within ; inner lip 

 plicate. Operculum with apical nucleus. 



3. Septa costata, Born, 1778. Plate 43, tig. 2. 



Murex costatus, Bom, Test. Mus. Cses. Vindob., 1778, 295. M. olearium, L., 

 Syst. Nat., ed. xii, 1767 ; not of Linne, 1758. Tritonium olearium, L., 

 M.N.Z.M., 64. Triton olearium, L., Conch. Icon., ii, pi. 10, f. 32 ; Man. 

 Conch. (1), iii, 11, pi. 3, f. 19 ; pi. 4, f. 24 ; pi. 5, f. 27-29 ; pi. 6, f. 37. 

 Lotorium olearium, L., Index, 75. Triton olearium, L., 1767 : Watson, 

 J.L.S., xxvi, 321 ; Kesteven, P.L.S. N.S.W., 1901, 712, pi. 35, f. 4, 5 

 (protoconch). Murex parthenopus, von Salis, 1790. Triton succinctum. 

 Lamarck, A.s.V., vii, 181. T. (Simpulum) acclivis, Hutton, C.M.M., 

 13, plate fig. 8. T. (Simpulum) costatus, Born : Watson. Chall. Rep., 

 xv, 390. 



Shell moderately large, solid, broadly fusiform, with strong re- 

 volving ribs. Sculpture consisting of strong nodulous spiral ribs, 2 on 

 the spire-whorls and about 14 on the body-whorl, very frequently 

 partially separated into approximate pairs by an incised line ; some- 

 times they are partially broken up into revolving series of granules ; 

 there are 2 or 3 fine cinguli on the shoulder, and usually 1 between 

 the strong ribs ; on the body-whorl only 6 are stout, the remainder, 

 upon the neck, low and narrow ; there is only 1, not much elevated, 

 varix on the body-whorl, to the left of the aperture. Colour light 

 brown, the varix and lip usually tessellated with dark brown, the 

 columella frequently of the same colour between the whitish plications. 

 Epidermis present in fresh shells ; it is thin, horny, developing at 

 frequent intervals into longitudinal reflexed ridges, produced into 

 long hair-like digitations. Spire more or less elevated, conic ; outlines 

 convex. Protoconch a.ttenuately conical, corneous, of 6 microscopically 

 reticulate whorls, separated from the succeeding whorls by a slight 

 varix. Whorls 9 to 10, the last rather large, distinctly shouldered, 

 slightly convex ; base flattish, depressed above the neck. Suture 

 impressed, uneven. Aperture oblique, oval, with a distinct channel 

 above, and a short, open, somewhat recurved canal below. Outer Up 

 thick, with a strong nodulous varix on the outside, deeply grooved 

 on the inside. Columella subvertical, almost straight, inflexed to- 

 wards the canal. Inner lip extending over the parietal wall and the 



