208 



LAFOEIDyE. 



2. C. FASTIGIATA, Alder. 



CAMPANULARIA FASTIGIATA, Alder, Ann. N. II. for February 18(30. 



Plate XXXIX. fig. 3. 



STEM creeping, smooth, closely adherent; HYDROTHEC.E 

 large, oblong, tubular, gradually tapering off below into 

 a pedicel, which is smooth and of variable length, above 

 " rising into two opposite points, between which a plaited 

 membrane on each side slopes over the aperture, forming 

 an operculum with a medial ridge"*; GONOTHEC.E un- 

 known. 



Height of calycle ^ inch. 



ALDER has pointed out the resemblance of the remarkable 

 operculum with which this species is furnished to the roof 

 of a house, " the two opposite angles forming the gables." 



The pedicel is commonly about a third of the length of 

 the calycle, but sometimes 

 much longer. It exhibits 

 no trace of annulation. 



The Lafoea plicatilis of 

 Sarsf (Woodcut, fig. 25) 

 resembles this species in 

 the structure of the oper- 

 culum, but is otherwise dis- 

 tinct. It belongs to the 

 present genus rather than 

 to Lafoea. 



Hob. On the stem of a Eudendrium from the inner 

 Hauf, Shetland (Barlee): the Hebrides (A. M. N.): on 

 Plumularia tubulifera &c. from Cornwall (T. H.). 



* Alder. 



f " Bemrerkninger over fire norske Hydroida," Videnskabs. Forhandl. 

 1862. He describes the gonothecw of L. pJicafiUs, which are very long and 

 cylindrical, and contain many gonophores ; but he has not observed the 

 development of the sexual zooids. 



