24 TROCHUS. 



T. ARCHITECTONICUS A. Adams. PL 42, fig. 1. 



Shell conical, imperforate, whitish ; whorls flat, subimbricating, 

 longitudinally costate, the ribs thick, rounded, subnodose ; base flat, 

 concentrically strongly lirate; coluraeila short, tortuous, truncate 

 anteriorly ; margin of lips fimbriated. (Adams.') 



Signet Bay, North Australia (Dring.) 



Pyramis architectonicus A. AD., P. Z. 3., 1857, p. 152. Trochus 

 architectonicus REEVE, Conch. Icon., f. '2'2. 



Evidently allied to the preceding. Reeve's figure is copied on my 

 plate. 



Subgenus INFUNDIBULUM Montfort, 1810. 

 Infundibulum MONTF., Conch. Syst., p. 167. Carinidea SWAIN- 

 SON, Treatise on MalacoL, p. 350. Polydonta SCHUMACHER, Essai 

 d'un nouv. Syst. etc., p. 231, (1817) and of H. & A. AD., Gen. Rec. 

 Moll., i, p. 414, and other authors, (not Polydonta Fischer de Wald- 

 heim, (1807) Lamprostoma SWAINSON, Treatise on MalacoL, p. 350. 



Section LAMPROSTOMA Swainson, 1840. 

 T. MACULATUS Linne. PI. 9, figs. 100, 1, 2, 3. 



Shell conic, solid, heavy, falsely umbilicate ; spire strictly conic, 

 or swollen and somewhat convex below, accuminate above, or some- 

 times constricted around the upper part of the last whorl ; whorls 

 about 10, quite planulate, or concave toward the upper, convex to- 

 ward the lower margins, the last cariuated at the periphery, flat be- 

 neath ; color of upper surface consisting of longitudinal stripes or 

 flames of brown, purplish, magenta, rose or coral red on a ground of 

 white, corneous, pink or olive-tinted, the flames occupying more space 

 than the ground color or vice versa ; sometimes the coloration con- 

 sists of very narrow numerous radiating lines, usually broken into 

 tessellations articulating the line ; the base is radiately painted with 

 zigzag flames, or more frequently, narrow lines, either continuous or 

 interrupted, often broken into a maculated or a finely tessellated pat- 

 tern, sometimes unicolored lilac, or even white ; sculpture of upper 

 surface consisting of spiral beaded lirse, usually numbering six to eight 

 on each whorl, the beads either laterally compressed like longitudinal 

 folds or rounded and separate ; base concentrically sculptured with 

 numerous (about 10) fine, more or less beaded line ; aperture 

 transverse subtrigonal, outer lip lirate within, basal margin slightly 

 curved, four or five dentate, parietal wall sometimes calloused and 

 lirate, sometimes smooth ; columella heavy, subvertical or oblique, 



