BRITISH ZOOPHYTES. 283 



No avicularia. Zoarium (in British species) incrusting. 

 — T. H. 



1. P. LABROSA, Bush. 



Lepralia labrosa {Bush, T. H., A. M. N.), Alysidota 

 labrosa {Bush), 



Hab. : Shetland {A. M. K), South Devon {T.E.), 

 Hastings {Miss Jelly), Cornwall {C. W. P.). 



This is a deep-water species. The cells bi'anch in 

 single or double series. They are oval^ and thickly 

 punctured. The orifice is semicircular, with three 

 teeth on its lower margin, and with a prominent well- 

 developed peristome around the front. 



2. P. coLLAKis, Norman. 

 Lepralia collaris {A. M. N.). 



Hab. : Guernsey {A. M. N.), Torbay, Isle of Man 

 (T. H.), Hastings {Miss Jelly). 



This species much resembles the preceding. It 

 does not, however, branch in single series, but forms 

 brownish patches. The zocecia are plain, and the 

 orifice is destitute of the three denticles described as 

 characterizing P. labrosa. 



3. P. ExiMiA, Hinchs. 



Lepralia eximia {T. H., C. W. P.). 



Hab. : Cornwall (G. W. P.), Shetland {A.3LN.). 



The colonies of this species incrust shells and stones, 

 and spread in lobed patches. It is found in deep 

 water. The peristome develops into "triangular ex- 

 pansions " on each side of the orifice. On the lower 

 margin of the orifice are three small denticles. 



(c) With a mucronate peristome. 

 Genus VI. Mucronella, Hinchs. 

 Zooecia with a suborbicular or semicircular orifice ; 



