Dr. A. Philippi on the genus Serpida. 159 



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

 conico; pedunculo utrinque filuni gerente [ut in V. triqtietrct]. 

 (Fig.L.) 



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

 laevibus, quinque ornata [ut in V. clavigera']. Diam. ■^"" — |"". 



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., ^es^« 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 apertnres 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, antioe emar- 

 ginata, obscure bidentata. (Fig. O.) 

 I examined a softened specimen of the animal in Cassel. 



4. POMATOCEROS, Ph. 



1, P. tricuspis, Ph., ^es^a triquetra, ssepe in gyrum contorta, alba. 



Diam. 2"". 

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

 ultra 18 ; operculo hemisphaerico, vertice cornubus tribus acutis 

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

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

 Hoffmann, 'Verhandl. Berl. Gcsells.^ vol. iii. p. 150. It may pro- 

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

 f. 15. vidthout description. Does S. vermicularis, Cuv., ' Regne 

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

 massue est armee de deux ou trois petites pointes." 



Vermilia triquetra, 'Diet, des Sc. IV at.^ pi. 1. fig. 3, appears 

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

 figm-e to be coiTCct, consists of two appendages and supports a 

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



5. Cymospira, Saviymj. 

 No species belonging to this genus occm-s, as far as I am aware, 

 in the jMediterranean. 



