THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTOBY. 



[NINTH SERIES.] 



" per litora spargite museum, 



Naiades, et circum vitreos considite foil tea : 

 Pollice vicgin'eo teneros hie earpifce Sores : 

 Floribus et pietum. divae, replete canistmm. . 

 At vos, o Nymphae Craterides, ite sub unda.8 ; 

 Ite, recurvato variata eorallia truneo 

 Vellite museosis e rupibus, et mihi conchaB 

 Ferte, Dex pelagi, et pingui conchylia suceo." 



N.Ptirthenii. Ginnnettasi, \%&n 



No. 7. JULY 1918. [& 



^3i m 



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

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

 F.R.S., &c. 



[Plates T.-VI.] 



1. On some Points in the Structure of the Sabellidce, chiefly of Bispira 



volutacomis, 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 Sabellidae, 

 chiefly o/Bispira volutacomis, Montagu. 



Many authors have alluded to the structure of the Sabellids 

 since Cuvier noted that they rarely form a calcareous tube, 

 whilst they had the fan-like gills and the thoracic membrane' 

 of the Serpulids. In alluding to the branchiae of the 

 Sabellids he mentions " un filament charnu/' and, further, 

 that in this group the two " filets charnus " (fleshy filaments 

 — probably the tentacles) adherent to the branchiae 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 



