218 NORMAN; ON RARE BRITISH POLYZOA. 



BiCELLARIA AlDERI;, Busk. 



Bicellaria Aldei'i, Busk. Quart. Journ. Mic. Sci., 1860, p. 

 143, pi. xxviii, figs. 1 — 3 ; Smitt, Ofver- 

 sigt af K. Vet. Akad. Forh., 18G7, p. 

 289, pi. xviii, figs. 4—8. 

 — unispinosa, M. Sars. Geol. Zool. eg Jagttagelser 

 anstellede paa en Keise i en Deel af 

 Trondhjens Stift, 1863, p. 34. 

 The ovicells in this species remind one, in their form, of 

 the flower of the calceolaria, to the form of which they bear 

 a close resemblance. They lean backwards, are imperforate, 

 polished, sculptured with fine raised lines radiating in a fan- 

 like form from the centre of the lower margin, and terminat- 

 ing at a circular, similarly raised line, which girdles the 

 ovicell near its summit. 



The only spot in Shetland in which I have dredged this in- 

 teresting Bicellaria is 5 — 7 miles cast of the Island of Balta, 

 in 40 — 50 fathoms. The ground is soft ; the dredge comes up 

 choked with thousands of Ascidia sordida, great quantities of 

 Tiibularia gracilis, Haleciuin halecinum, Sec, and attached 

 to these Hydrozoa is found the Bicellaria. Since the species 

 was described by Mr. Busk from Mr. Barlee's specimens it 

 has been found by Professor Sars in Norway, and described 

 under the name above quoted. 



BUGULA CALATHUS, 11. Sp. PI. VI, figS. 3 — 8. 



PoJyzoary consisting of a number of strap-formed, dicho- 

 tomously dividing brancbes, spreading regularly round on 

 all sides from the base, and forming an elegantly shaped 

 shallow cup, all the straps generally of about equal length ; 

 drying of a yellowish horn colour. Cells in about 6 — 8 rows, 

 oblong above, with two stout, blunt spines at each angle. 

 Ovicells globular, large, imperforate, smooth, polished, with a 

 raised, thread-like, transverse line near their base. Lateral 

 avicularia large ; smaller avicularia here and there on the 

 margins of the inner cells. Height of a large specimen three 

 fifths of an inch, diameter one inch and a quarter. 



Under stones between tidemarks, Herm. 



This species comes very near to B, flabellata, and much 

 more so in its microscopical than in its general characters. 

 Instead of being convoluted, as is generally more or less the 

 case with B. flabellata, it always takes the form of an elegant 

 simple cup, and the breadth is much greater in proportion 

 to the height than in the allied species. B. flabellata turns 



