306 NATURAL HISTORY OP 



nent, with one large and two smaller teeth. The 

 surface of the colony is often mamillated. 



A variety of this species (meandrina) occurs in which 

 a number of confluent colonies are united together. 



2. L. EADiATA, Audouin. 



Melobesia radiata (Savigny, Audouin), Tubulipora 

 patina {M.-Edw.), Unicavea radiata (D'Orh.), Discopo- 

 rella flosculus (T. H.), D. radiata (Biisli:), Discosparsa 

 patina {Heller). 



Hab. : South Devon {T. K). 



This species forms circular convex colonies about 

 J in. in diameter. The zooecia are arranged in rays of 

 alternately long and short tubes^ and project with more 

 or less mucronate orifices above the surface of the 

 zoarium. Between each row of cells and the one next 

 to it is a row of pores which is sometimes double. 



3. L. VERRUCARiA, Fabricius. 



Madrepora verrucaria (Fahr.), Discoporella verru- 

 caria {Smitt, Busk). 



Hab.: Orkney [Barlce), Arran (Busk). 



This is a northern species^ and is distinguished by 

 its simple hemispherical zoarium. The cells are usually 

 arranged in radiating lines, with an acuminate orifice 

 which is sometimes bifid. The orifices project more 

 and more as the cells near the margin of the colony. 

 *' The ovicel is a calcareous inflation often occupying the 

 whole of the upper surface of the centre of the disc." 



4. L. REGULARis, D'Orhigny. 

 Actinopora regularis (D'Orh.). 

 Hab. : Shetland (A. M. N.). 



A deep-water species. The zooecia are placed in rays 

 tapering towards the centre, and around the margin 

 is a cellular border sloping up towards the rays. 



