308 Eev. T. HIncks on the 



Range. Britain ; France, S.W. ; North and Arctic seas ; 

 Mediterranean (Capri) ] Queen Charlotte Islands, North 

 Pacific. 



Diastopora sarniensiSj Norman. 



Range. Britain (south) ; Mediterranean (probably) ; Queen 

 Charlotte Islands. 



Family Frondiporidae. 



Fkondipoea, Iraperato. 



Frondipora verrucosa^ Larax. (sp.). 

 Frondipora reticulata, Blainville, Busk. 



So far as we can judge from Lamouroux's description and 

 figures there would seem to be no important difference between 

 his species and the F. reticulata of Blainville and others. If 

 we examine a series of the common Mediterranean species 

 we find specimens in which the fasciculi form distinct and 

 separate projections, and others in which the fasciculated ele- 

 vation is more or less continuous. In almost every specimen 

 the latter condition exists to some extent ; towards the extre- 

 mities of the branches especially (though not exclusively) 

 the fasciculi commonly form elongated prominences, whilst in 

 other parts of the zoariura they appear as isolated protuber- 

 ances; and specimens occur (undistinguishable in other respects 

 from the above) in which the confluent or continuous arrange- 

 ment of the fasciculi largely predominates. The zooecium is 

 reticulate or simple in habit. 



Range. Mediterranean ; Kamtschatka and Spitzbergen 

 (according to Lamouroux) . 



Suborder Ctenostomata. 



Family AlcyonidiidaB. 

 Alcyonidium, Lamouroux. 



Alcyonidium gelatinosum, Linn. 



Range. Britain ; North and Arctic Seas j North America ; 

 Queen Charlotte Islands ; Natal. 



Alcyonidium mytili^ Dalyell. 

 Range. Britain ; Bahusiaj Jan May en j Baltic Sea; Naples. 



