Dr. A. Philippi on the genus Serpula. 159 



Animal rubrum ; branchiarum utrinque filis 6 — 8 ; operculo elongato- 

 conico; pedunculo utrinque filum gerente [ut in V. triquetra']. 

 (Fig. L.) 



7. V. quinquelineata, Ph., testa tereti, lineis elevatis, longitudinalibus, 

 laevibus, quinque ornata [ut in V. clavigerd] . Diam. -j"" — |"". 



Animal branchiarum lutescentium filis utrinque 8, rubro maculatis ; 

 operculo conum brevem obliquum referente [fere ut in S. calyp- 

 trata~\. (Fig. M.) 



8. V. polytrema, Ph., testa triquetra adnata ; carinis foris frequen- 

 tibus perforatis. Diam. 1|-"". 



Animal coccineum, branchiarum filis utrinque c. 6 ; operculo forma 

 coni obliqui brevissimi ; pedunculo albido annulis tribus fuscis 

 ornato et utrinque filum gerente [ut in nr. 1 et 6]. (Fig. N.) 



In Vermilia triquetra and other triangular Serpula, the keels 

 consist when broken through of a series of cells ; in this species 

 only the septa as it were of the cells are developed, and the three 

 keels perforated by the rows of their apertures are highly elegant 

 in appearance. The diameter of the tubes is very small, from the 

 lateral adherent margins occupying the greater portion of the 

 diameter. 



9. V. emarginata, Ph., testa tereti, alba, carinis 3 — 4 ssepe in dentes 

 antrorsum directos, dorso incisos elevatis. Diam. 1"". 



Animal filis branchiarum utrinque 6 — 7 ; operculo formam coni ob- 

 liqui truncati referente ; pagina superiore marginata, antice emar- 

 ginata, obscure bidentata. (Fig. O.) 

 I examined a softened specimen of the animal in Cassel. 



4. PoMATOCEROS, Ph. 



1. P. tricuspis, Ph., testa triquetra, ssepe in gyrum contorta, alba. 



Diam. 2"". 

 Animal branchiis albo et coccineo, sive albo et fusco fasciatis ; filis 

 ultra 18; operculo hemisphserico, vertice cornubus tribus acutis 

 instructo ; pedunculo utrinque filum gerente. (Fig. P.) 

 Very common. This appears to be the Serpula triquetra, Fr. 

 Hoffmann, ' Verhandl. Berl. Gesells/ vol. iii. p. 150. It may pro- 

 bably likewise be S. triquetroides (!), Delle Chiaje, Mem. iv. t. 67. 

 f. 15. without description. Does S. vermicularis, Cuv., f Regne 

 Anim.' ed. 2. iii. p. 191, likewise belong here ? " son opercule en 

 massue est armee de deux ou trois petites pointes." 



Vermilia triquetra, ( Diet, des Sc. Nat/ pi. 1. fig. 3, appears 

 to form a second species, the operculum of which, supposing the 

 figure to be correct, consists of two appendages and supports a 

 forked appendage, the two ends of the fork being obtuse. 



5. Cymospira, Savigny. 



No species belonging to this genus occurs, as far as I am aware, 

 in the Mediterranean. 



