16 EUCRATIID^J. 



HABITAT. On weed, shells, stones, crabs, &c., between 

 tide-marks more especially, and in the Laminarian region, 

 and from moderate depths. 



LOCALITIES. Common and widely distributed. Ayrshire 

 (Landsb.) : St. Andrews, on Ceramium rubrum and Serf, 

 pumila Sec., between tide-marks (Dr. Mclntosh) : Scar- 

 borough, very rare (Bean) : Brighton and Hastings, very 

 rare (W. W. Saunders) : on all sides of Ireland (W. T.) : 

 Northumberland, on small weeds and zoophytes, tide- 

 marks and a little beyond (Alder) : south-west of Durham, 

 rare (J. Hogg): Isle of Man; Filey, under stones ; South 

 Devon, very common ; Salcombe, on Laminaria digitata, 

 a favourite habitat, growing amongst the forests of Obelia 

 geniculata ; St. Ives, Cornwall, of great size and beauty, 

 also on Laminaria ; Ilfracombe, off the Capstone, 8-10 

 fath. (T. H.) : Conneraara, rock-pools (G. S. B.) : Shet- 

 land (C. W. P.) : &c. 



Var. a. On shells dredged off Maughold Head, Isle of 

 Man (T. H.). 



Var. . North Devon (A. Leipner). 



GEOGRAPHICAL DISTRIBUTION. Bahusia, 5-10 fathoms ; 

 Southern Norway (Smitt) : Hougesund, on Delesseria, 

 5-20 faths. (Kirchenpauer) : south-west coast of France 

 (Fischer) : Bay of Cadiz (Kirchenpauer) : Australia, abun- 

 dant, normal and var. gracilis (T. H.). 



In this very pretty species the cells are white, smooth 

 and glossy, and are linked together in series, so as to 

 form delicate, somewhat curved, confer void tufts. At 

 times the shoots are clustered, but generally they are 

 distributed irregularly on the trailing fibre. Ellis gives 

 a good idea of the cell, in likening it to a bull's horn ; 

 Couch, on the other hand, sees in it a resemblance to a 

 shoe. The lowest cell in a shoot is generally much pro- 



