57 



Trochus acinosus. Testa solida, convexo-conica, aeruginosa, P< fZ- 

 seriebus 4 papillarum insignis et lineolis capillaceis volventibus 

 ubique insculpta; serie antica majori : spira anfr. 6 planiusculis, 

 ultimo acutangulato : basis excavata, cinerea, fills concentricis 

 fuscis cincta ; interspatiis indentatis ; regione umbilicali infundi- 

 bulifbrmi et costis duabus tri-partita : apertura rhombea ; colu- 

 mella laevi, contorta ; labro simplici, perobliquo. Diam. it, alt. f 

 poll. Hab. New Zealand. 



The peculiarities of this species are, the series of tubercles on 

 the delicately lineated ground, the excavated base with its thread- 

 like unbeaded lines, and the two white ribs in the umbilical pit. 

 May be compared with T. vernus, Chem. 



Trochus elisus. Testa parva, elevato-conica, imperforata, 

 cinerea: spira anfr. 6 declivibus, sutura. fossali valde profunda 

 discretis, costulis transversis granosis tribus (quorum interme- 

 diani minore) cincta, interspatiis clathratis : basis convexa, cos- 

 tulis clathratis insculpta : apertura subcircularis ; columella gran- 

 ulata ; labro intus sulcato. Diam. f , alt. £ poll. Dredged at 

 Singapore. 



Distinct from any described species. Its markings are deeply 

 sculptured, and its peculiar sutural region is a character which 

 cannot fail to be noticed at first glance. It is quite probable that 

 it may be colored differently when quite fresh. 



Trochus bicrenatus. Testa pyramidata, fiavescens, flam- 

 mulis rufis alternis saturatioribus ornata, lineis equalibus granu- 

 losis cincta: spira anfr. 7-8, pene concavis, ad peripheriam 

 acutis et denticulis roseo-crenulatis ad 15 munitis : basis planu- 

 lata ; vortice umbilicali eburnea : apertura trapezoidca ; colu- 

 mella, contorta. Diam. £, alt. f poll. 



The species most resembling it are T. Jimbriatus, Lam., and 

 T. Buschii, Phil. ; but from these and all others it is well distin- 

 guished by its doubly crenate margin, as viewed from below. 

 The profile outline is a little concave. 



Trochus circumsutus. Testa solida, elevata, accurate conica, 

 imperforata : spira anfr. 9 subangulatis, superne declivibus, infra 

 nodis obliquis et liris granosis cinctis : color cinerea, portionibus 

 cavatis saturate olivaceis suturas simulantibus: basis planulata, 

 sulcis filiformibus concentricis ad 12 insculpta; regione umbilicali 



