POMATOCEROS PAUMOTANUS. 479 



Stoa Serres (1855) was proposed for two shell-boring serpulids (*S. perforana 

 and S. spirulaeformis) . The species and the genus seem too incompletely 

 characterized for certain identification. 



Piratesa Templeton (1835) and Zopyrus Kinberg (18GG) are also too incom- 

 pletely known to be included in the key, their descriptions being particularly 

 defective in lacking proper accounts or figures of the uncini. 



Membranopsis Bush, though near Protula, cannot be taken up in the key. 



Paravermilia and Metavermiha Bush are here included in Vermiliopsis 

 St. Joseph. 



Polyphragma Quatrefages (1865) is a synonym of Eupomatus Morch. 



Codonytes Quatrefages (1865) is in synonymy with Eucarphus Morch. 



Cymospira Blainville (1828) is a synonym of Spirobranchus Blainville 

 (1817). 



Heterodisca Fleming is regarded as synonymous with Spirorbis Daudin. 



Spiroglypha Daudin (cited as Spiroglyphis by Grube), placed near Serpula, 

 is probably not to be again recognized, as only the tubes of the two included 

 species were observed. 



Spiramella Blainville (1828) is the same as Protula Risso (1826). 



PoMATOCEROs Philippi. 



Ann. mag. nat. hist., 1844, 14, p. 155; Morch., Naturh. tidsskr., 1863, scr. 3, 1, p. 408. 

 POMATOCEROS PAUMOTANUS, Sp. nov. 



Plate 78, fig. 6-9. 



The type is clear yellow throughout except the operculum, which is distally 

 paler, whitish. 



The total length is 17 mm. The branchiae in their present condition extend 

 3.5 mm. beyond the thorax and distinctly exceed the operculum. The thorax 

 is of the usual structure. The abdomen consists of about ninety-five somites; 

 it is compressed dorsoventrally, in cross-section transversely elHptic; of uniform 

 width throughout, excepting at the abruptly narrowed caudal end, which is ob- 

 liquely truncated and, viewed from above, appears obtusely pointed; it is con- 

 stricted a short distance in front of the caudal end; ventrally there is a sHght 

 sulcus along each side; dorsally there is the usual median longitudinal furrow 

 which widens and deepens toward the caudal end. 



