iro 



3) processibus digiliformihus longo pluiibus, 17 — 18; 4) I 

 iisdem inferlus cavis , plicatis, infia basin desoenrlentibus, 

 5) lahro »emicirculari , neque versus b;isin rectilineo. 

 Examen pluriuin speciniinum docebit utnnn sit bona 

 species an varietas. 



Trochus neritoides*) Ph. « 



Tr. testa semiglobosa, perobhqua, imperforata, laevi, 

 nigra, lineis frequentibus albis in ziczac flexis picta; an- 

 fVactibus rapide crescenlibus, spira retusa; apertura semi- 

 ovata; labro lenui inferius dnplicalo et grosse crenato; 

 coluinella plansi, sulco parallelo exarafa, basi den(e acute 

 terminata. Alt. obh'qua 6'/./" 5 diam. 7'/./". 



Tr. neritoides Ph. Conch. Cab, t. 44. f. 4, 

 Palria? Ex itinere pericosmio adulit cl. Edw. Belcher 

 Vidi in coli. cl. Hanley. 



Testa propter fbrinam somiglobosam, spirani oblusis- . 

 simam, anfractus rapide crescentes et basin planain Neri- ' 

 tae siniillima. Anfractus modo quinque, superiores lineis 

 transversis exarati, plani; penullimus convexus, ultimus 

 laevissimus oblique descend<ns, su|>erius depressus, fere 

 concavus. Aperiura fere exacte ut in Tr. canalifero. 

 Pars exterior labri n)argaritacea, subsulcata, interior por- 

 cellanea alba, in basi prominente ad instar costae suicis 

 duobus grossis sculpta; fauces iterum margaritacei. Co- 

 lumella deprcssa, plana arcuata , basi dente acuto termi- 

 nata, exlus sulco parallelo exarata. Color niger, strigis 

 anguslis albis confertis in ziczac flexis picta; spira ple- 

 rumque unicolor nigra. Variat testa spira elatiore, minus 

 a forma solita recedente. 



*) Tr. neritoides Gm. p. 3577. nr. 123 est Tr helicinus 

 0. Fabric, cujus nomen perperaai Gmeliu niutavit. 



