THE xVNNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[NINTH SKEIES.T 



" perlitora 9par(;ite museum. 



Naiades, et circimi vitreos consirtite fontes : 

 Pollice virgineo fceneros hie carpite flori-s : 

 Floribus et pictiira. divae. replete canistniin. 

 At vos, o Nymphse Craterideg, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 Vellite muscosis e rupibus, et inilii conchas 

 Ferte, Deoe pelagi, et pingui conchylia suceo." 



N. Ptirthenii Gianiieflasi, lie). ] . 



No. 7. JULY 1918. 



I. — Notes from the Gatty Marine Laboratory, St. Andreins. 

 —No. XLI. By Prof. M'Intosh, M.D., LL.D., D.Sc, 

 F.R.S., &c. 



[Plates J.-VI.] 



1. On some Points in the Structure of the Sahellidcs, chiefly of Bisjnra 



volutacornis, Montagu. 



2. On some Points in the Structure of the Serpulidce, chiefly of Pomato- 



cerus triqueter, L. 



1. On some Points in the Structure of the Sabellidffi, 

 chiefly of Bispira volutacornis, Montagu. 



Many authors liave alluded to the structure of the Sabellids 

 since Cuvier noted that they rarely form a calcareous tube 

 whilst they had the fan-like frills and the thoracic membrane 

 of the Serpulids. In alluding to the branchiae of the 

 Sabellids he mentions " un filament oharnu/'' and^ further 

 tliat in this group the two " filets charnus ^■' (fleshy filaments 

 — probably the tentacles) adherent to the brauchise do not 

 form an operculum. Most text-books, like those of Huxley, 

 Gegenbaur, and Hayek, contain references to the " carti- 

 laginous " skeleton in Sabellids and Serpulids. 



Ann. & Mag. N. Hist. Ser. 9. Vol. ii. 1 



