Manchester Memoirs, Vol xlii. (1898), No. 13. 3 



XV. Schizoporella hyalina (variety). 

 XVI. Smittia landsborovii Johnston. 



Hincks, Brit. Mar. Polyzoa, p. 341. 

 XVII. Porella tridentata, sp. nov. 



CtenoSTOMATA are only represented by some badly 

 preserved fragments of the genus Bowerbankia, the species 

 of which I have been unable to identify. 



Of the preceding species, two are cosmopolitan in 

 shallow water and are also found in some regions in deep 

 water ; this fact is referred to later. 

 I. Microporella ciliata, on weed, among debris, and on 

 Mytilus. 

 II. Schizoporella hyalina, on weed and shell {PJiotimtla). 

 It is noteworthy that both these forms occur on weed. 



The following species are common to the northern 

 hemisphere, including Britain, and the Falklands : — 



I. Lepralia adpressa, on shells {Photinula violacea and 



Trophon uticriciformis). 



Habitat: Britain (Torbay, Guernsey, Hastings). Medi- 

 terranean (Algiers, Naples, Bay of Gibraltar). Aus- 

 tralia. Chiloe. Falklands. Mazatlan. 



Moderate to deep water. Fossil — Italian pliocene. 



II. Membranipora membranacea. 



Habitat: Britain; universal and abundant. Hviding- 

 soe. Hougesund (Norway). Roscoff. Finisterre 

 (France). Adriatic. New Zealand. Australia. 



Range in time — coralline crag. PaLneolithic. 



Occurs only in temperate seas in shallow water. 



III. Microporella mahtsii. 



Habitat: Britain (widely distributed and abundant). 

 Gullmarcn. Bahusia, 10-20 fath. Bergen. Fin- 



