198 CRIBRILINID^. 



Cribrilina Gatty.e^ Busk. 



Plate XXV. fig. 10. 



Lepralia Gatty.e, Busk, B.M. Cat. ii. 73, pi. l.vxxiii. fig. 6 : Landsborough, 



Pop. Hist. B. Z. 326, pi. xviii. fig. 71. 

 Lepralia Steindachneri, Heller, Bryoz. d. Adriat. Meer, 33, pi. ii. fig. 5. 



Zooecia ovate^ distinct^ divided by deep sutures, produced 

 and pointed below, very minute, quincuncial ; in the 

 centre a raised subcircular area, umbonate, with radia- 

 ting lines, scalloped round the margin, a circle o£ punc- 

 tures within the edge of the area, and another sur- 

 rounding the umbo ; rest of the cell smooth and glassy, 

 sometimes with radiating striae ; orifice semicircular, infe- 

 rior margin straight, immediately under it three minute 

 punctures, of which the central one is the largest; a 

 vibraculum on each side a little below it; marginal 

 spines five, black or brown at the base.' Avicnlaria none. 

 Ooecia globose, smooth and shining, minutely punctured ; 

 two spines showing in front of it. 



Colonies originating in a small oval or subcircular 

 cell, with membranous covering and about ten marginal 

 spines, and forming small, silvery-white patches. 



Var. a. Zooecia covered with radiating ridges ; a screen- 

 like elevation placed transversely a little below the 

 inferior margin. Ocecia ridged. The spines in this 

 beautiful variety are dark -coloured both at the top and 

 at the base. 



Habitat. On Phyllophora rubens and other Algse, and on 

 shells, from moderately deep water. 



Localities. Sidmouth (Mrs. Gatty) : Jersey, on weed 

 (Alder) : Guernsey, on shell dredged off Fermain Bay 

 (T. H.) : Hastings, normal, and var. a (Miss Jelly). 



Geographical Distribution, Adriatic (Heller). 



This is the smallest of its tribe ; and its minute size and 

 delicate whiteness are characters that at once attract the 

 eye. It has a special liking for PhyJInphora rubens, the 



