620 Scientific Proceedings, Royal Dublin Society. 



In his "Floridan Bryozoa" Smitt described an hemescharon 

 form of Sniittia, and proposed to name it Escharella spathulata; 

 a similar form from Torres Straits, and in the British Museum 

 Collection, is referred to. 



In Professor Haddon's Collection several handsome masses of 

 this species occur in the form of masses about 3^- inches in area, by 

 2 to 3 inches in height, and composed of stout, hollow, tubular 

 anastomosing branches. 



Avicularia of several kinds abound ; on one side of the orifice 

 is one with a spathulate mandible. There are three oral denticles. 

 The operculum is membranous, and generally shrivelled up. It 

 scarcely takes the stain of picrocarmine. The trace of a pectinate 

 ridge exists at the back of the orifice of some zooecia. Traces, also, 

 of spines exist in the form of one to three minute pits at the back of 

 the peristome. 



The ovicell is frosted, with a semicircular punctured area in 

 front, bounded by a ridge. In the earliest stage the ovicell is pro- 

 bably uniformly punctured. 



Mucronella (Discopora) nitida, Yerrill, has been given as a 

 synonym of Smittia sjiathalata ; but, judging from a specimen 

 sent to the British Museum by the U. IS. National Museum, the 

 former species is quite distinct, and would be classed under 

 Schizoporella. Professor YerrilPs 1 figure is, however, certainly 

 that of a species of Smittia. 



Habitat. — Murray Island, 15-20 fms. 



Smittia levis, n. sp. 



(PI. xvi, fig. 8.) 



Zoarium encrusting, orange-coloured zooecia '2 mm. in breadth 

 by '5 mm. in length. Front surface smooth, with large marginal 

 areolae ; primary orifice oval ; proximal margin with one large 

 denticle, and two rudimentary lateral ones ; distal margin with a 

 well-developed horizontal pectinate ridge. On the centre of the 

 front of each cell an avicularium with triangular mandible pointing 

 downwards ; ooecium smooth, hyaline, depressed. 



1 Verrill. " American Journal of Science" (3), ix., 1875, p. 415, PL VII., fig. 3. 

 Verrill. "Proc. U. S. Nat. Mus." n., 1879, p. 195. 



