242 SERTULARIIDJE. 



[Greenland (Fabricius) : North Cape, between tide- 

 marks (Sars) : Square Island, Labrador, in 30 fathoms, 

 rare (A. S. Packard, jun.).] 



5. S. TENELLA, Alder. 



SERTULARIA RUGOSA, var., Johnsf. B. Z. 64 & 62, fig. 8 c. 



TENELLA, Alder, North. Cat. in Trans. Tynes. F. C. iii. 113, 



pi. iv. figs. 3-6. 



Plate XLVII. fig. 3. 



ZOOPHYTE minute ; STEMS short, slender, simple or slightly 

 branched, zigzagged, and jointed and twisted above each 

 calycle; HYDROTHEC^E rather distant, elongate, barrel- 

 shaped, finely ribbed across, the aperture erect, patent, 

 squared, ^-toothed, and closed by a four-sided opercu- 

 lum; GONOTHEC.E ovate, slender, ringed transversely, 

 produced above into a short tubular orifice. 



"Tflis pretty little species is smaller and more delicate 

 in all its proportions than S. rugosa, with which it has 

 hitherto been confounded. The cells are more erect, 

 narrower, and more closely and regularly ribbed or 

 wrinkled across, the wrinkles generally rising a little op- 

 posite each angle ; there are six or seven in this species ; 

 in S. rugosa three or four." .... In the latter " the 

 aperture is much less prominent, and always bent out- 

 wards." .... The cells of S. tenella " are more dis- 

 tant than those of S. rugosa/' in this respect resembling 

 S. polyzonias ; but they are more slender and elongated 



than in either species The " polypes appear to be 



yellow or orange-colour/'' (Alder.} 



Hob. Northumberland, on Plumularia falcata and other 

 zoophytes, but not common (J. A.) : South Devon, be- 

 tween tide-marks; Filey, Yorkshire (T. H.) : Peterhead, 



