24 TROCHUS. 



T. ARCHiTECTONicus A. Adams. PI. 42, fig. 1, 



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

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

 concentrically strongly Urate ; coluraeila short, tortuous, truncate 

 anteriorly ; margin of lips fimbriated. (Adams.) 



Signet Bay, North Australia (Drivg^ 



Pyramis architectonlcus A. Ad., P. Z. S., 1857, p. 152. — Trochus 

 architectoiiicus Reeve, Conch. Icon., f. 22. 



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

 jilate. 



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 Limie. 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 carinated at the periphery, flat be- 

 neath ; color of upj^er surface consisting of longitudinal stripes or 

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

 Avhite, 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 lirje, 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 lira; 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, 



