184 VERMETUS. 



Y. POLITUS, Daudin. PL 54, figs. 84-86. 



Paucispiral, openly wound, like a hunting-horn ; whorls two, 

 rapidly enlarging to the rounded aperture, laterally attached 

 and corroding, white, smooth, with somewhat distant annular 

 constrictions. 



Indian Ocean, etc. On Tridacna and Serpula. 



V. perforans, Serres, is a S5'nonyra. 



V. NEBULOSUS, Dillw. PI. 54, figs. SI, 88. 



Young shell planorbiform, corroding, chestnut-color to white, 

 slightly spirally lirulate ; afterwards contorted, variegated with 

 light brown and white, lirae rugose, with three squamiferous 

 lirse above ; finally becoming free, with rugose annulations and 

 sulcations, and longitudinal sculpture obsolete. 



West Indies. 



Mcirch describes Vars. serrata, aculeata, turboides = Ser- 

 pula bicarinata, Sowb. (fig. 88), imbricata = Serpula dentifera, 

 Sowb., planorboides, rugosa, anaulax, fissurata. 



V. margaritarum, Yal. (in part). PI. 55, fig. 92. 



Large, spirally lirulate, with more distant nodose ribs, 

 chestnut-brown to yellowish. 



Panama — Mazatlan. 

 Y. MAXiMUS, Sowb. PI. 55, figs. 89, 90. 



Large, irregularly twisted, rather smooth, annularly rugose, 

 dorsal carina becoming spinose anteriorly ; often deeply im- 

 bedded in coral ; diara. of aperture 1 inch. The young shell is 

 subtriangular, with dorsal carina. 



Java — Polynesia. 



Mcirch describes several varieties ; among them he names 



SCANDENS, MEGACENTRO, PR^ELONGA, BIANGULARIS. 



Undetermined and Unjigured Species. 



Y. CARiNiFERUS, Gray. New Zealand. 



Y. LAMELLOSUS,Hutton. New Zealayid. 



Y. suBGRANosus, Miirch, witli Vars. carinata, costale, and 



TRiQUETRA. East Indies. 



Y. LURIDUS, Morch. Society Islands. 



