TROCHUS. 47 



P. MARi^ A. Adams. 



Testa turbinato-coiiica, <i,raiiulata, all)ida, rubro niaculata ac flam- 

 miilata ; anfr. coiivexiusculus, ultimo rotundato, plicato-noduloso, et, 

 ad suturas, corrugato, granulis in seriebus permultis, fequalibiis, 

 regularibus confertis depositis, basi cingulis granosis exsculpta, cavi- 

 tate coiitorta, um!)iHcum meiitiente, cingulo elevato, in dente unico 

 terminato exhibente ; labro intus sulcato. (Adavis.) 



Habitat luiknown. 



A very beautiful finely granulated species, with the last whorl 

 rounded and having many of the eharacters of Claviculus, \_sic] 

 thus showing the close affinity of the two genera. {Adams.) 



A. Ad. F. Z. S. 1«55, p. 223. 



P. (Infundibulum) lacertinum Gould. 



Testa depresso-conica, cinerea et olivaceo variegata ; anfr. 10, sub- 

 concavis, supernis seriatim granulosus, et ad suturam inconspicuam 

 subcrenulatis ; ultimo imprimis granulis compressis obliquis seriatim 

 cincto, tunc serie minori, denique ad peripheriam duobus majoribus ; 

 basi vix convexo, liris granulosis fusco maculatis insculpto ; umbil- 

 ico lato, polito, nacreo ; columella lobato, flexuosa ; fauce margarita- 

 cea ; apertura dolabriformis ; labro acuto. 



Alt. 25, diam. 25 mill. (Gould, in Proc. Bost. Soe. Nat. Hist, viii, 

 1861, p. 19). 



Hong Kong Harbor. 



Resembles P. hanleyanus Rve. but has fewer series of granules 

 and is granular beneath. ( Gould). 



Subgenus Clanculus Montfort, 1810. 



Clanculus Montf., Conch. Systematique, p. 191. — Monodonta, in 

 part, Lamarck and other authors. — Fragella Swains.-, Shells and 

 shell-fish, p. 352.— Otovia Risso, Hist. Nat. Eur. Merid., iv, p. 132, 

 1826. — Clancidopsis Monterosato, Bull. Sac. Malac. Ital., v, p. 

 222, 1879. 



The animal of Clanculus bears four pairs of tentacular filaments 

 on the epipodial line. The dentition (T. pharaonius, pi. 50, fig. 5,) is 

 similar to that of Trochus, but the body of the tooth is more expand- 

 ed, the centrals and laterals bearing large lateral supporting-wings. 



I was at first inclined to treat Clanculus as a genus distinct from 

 Trochus ; but on account of the difficulty of so defining the group 

 that its species may always be distinguished from Trochus, and the 

 lack of any tangible anatomical character differing from the latter 



