184 YERMETUS. 



Y. POLITUS, Daudin. PI. 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 synonym. 



Y. NEBULOSUS, Dillw. PI. 54, figs. 87, 88. 



Young shell piano rbiform, 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. 



Morch describes Yars. SERRATA, ACULEATA, TURBOIDES = Ser- 

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



Sowb., PLANORBOIDES, RUGOSA, ANAULAX, FISSURATA. 



Y. MARGARITARUM, Yal. (in part). PL 55, fig. 92. 



Large, spirally lirulate, with more distant nodose ribs, 

 chestnut-brown to yellowish. 



Panama Mazatlan. 

 Y. MAXIMUS, Sowb. PL 55, figs. 89, 90. 



Large, irregularly twisted, rather smooth, annularly rugose, 

 dorsal carina becoming spinose anteriorly ; often deeply im- 

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

 subtriangular, with dorsal carina. 



Java Polyn esia. 



Morch describes several varieties; among them he names 



SCANDENS, MEGACENTRO, PKJELONQA, BTANGULAR1S. 



Undetermined and Unfigured Species. 



Y. CARINIFERUS, Gray. New Zealand. 



Y. LAMELLOSUS, Hutton. New Zealand. 



Y. SUBGRANOSUS, Morch, with Yars. CARTNATA, COST ALE, and 



TRIQUETRA. East Indies. 



Y. LURIDUS, Morch. Society Islands. 



