SERTULARIADj; : SERTULARIA. 



73 



Fig. 13. 



Allied in texture, habit, 

 and in the shape of the po- 

 lype-cells to the preceding 

 species, from which it differs 

 in having vesicles consider- 

 ably larger, of an ovate 

 figure, rounded at the top, 

 and armed with eight spines 

 (fig. 13.), arranged in two 

 circles, one at the top, 

 and the other towards the 

 middle. It may be doubt- 

 ed whether this forms a good 

 specific distinction, seeing 

 how variable the vesticles 

 are in S. rosacea, and other species. 



" To this new and interesting species I have assigned the Chris- 

 tian name of a lady, distinguished not only for an ardent love of 

 the works of nature, but as a zealous collector in various branches of 

 natural history on these shores." A. H, H 'assail. 



With respect to the discovery of this Sertularia, I feel it necessary 

 to state that specimens were sent to me from Mr. Tudor, through my 

 ardent friend, Mr. T. Gr. Rylands, of Bewsey-House, many months 

 previously to its publication by Mr. Hassall. Mr. Rylands had 

 bestowed upon the species the name of Sert. Tudori ; and when 

 I suggested to him the possibility of its proving to be a robust state 

 of Sert. rosacea, he immediately, and in detail, pointed out their 

 diagnostick marks. As, however, the vesicles were wanting in all 

 Mr. Tudor's specimens, we waited the chance of finding one with 

 them before publishing a description ; and in the mean time fortune 

 gave that chance to Mr. Hassall, whose knowledge of the tribe at 

 once taught him to discern the peculiarities by which it is cha- 

 racterised. 



11. S. FALLAX, pinnate, the pinna alternate ; cells in pairs, 

 opposite, tubular, the upper part free and divergent, with an 

 even patulous aperture : vesicles ovate, four-cleft. Rev. J. 

 Fleming. 



PLATE XI. FIG. 5, 6, 2. 



Dynamena pinnata, Flem. Brit. Anim. 545. Sertularia pinnata, Jolms. Brit. Zooph. 

 127, pi. 9, fig. 5,6. Macgillirray in Mag. Nat. Hist. ix. 463. Dynamena tubi- 

 formis? /xnwoar. Expos. Meth. 12, pi. 66, fig. 6, 7. 



