A LIST OF THE ALG.E OF LAMLASH BAY, ARKAN. 63 



were towards the north channel, in seven to twelve fathoms. A 

 number of species was met, more or less rare, including Dudresnaya 

 coccinea, Bonnem., Scinaia /urcellata, Bivona, Bonnemaisonia 

 asparagoides, Ag., Lithothamnion corcdioides, Crn., var. suhsimplex, 

 Batters, nov. var., Hcdicystis oralis, Areschoug. This species was 

 obtained moderately common adhering to Lithothaiiinion cor'tdloides, 

 Crn., var. subsimplex, Batters, at a depth of seven to eight fathoms. 

 So far as I am aware, this Alga is new to Britain, wdth the 

 exception of one or two specimens dredged in from eight to nine 

 fathoms by Dr. Murray about two years ago in Kilbrannan 

 Sound, in company with the late Professor Schmitz and jMr. George 

 Murrav of the British Museum. 



My thanks are due to Mr. E. A. L. Batters, LL.D., B.A., 

 F.L.S., (fee, for his kind assistance. He has examined all 

 doubtful species. 



SERIES CYANOPHYCE^. 



Order Rivulariace^. 

 Calothrix, C. Ag. 



C. con/ervicola, C. Ag. 

 Rivularia, J. Ag. 



a. atra, Roth. 



SERIES CHLOROPHYCE^^. 



Order IlLVACEiE. 

 Enteromorpha, Link. 



E. clathrata. J. Asf. 



E. compressa, Grev. 



E. iniestinalis, Link. 

 Ulva, Linn. 



U. lactuca, Le Jol. ( = latissima. Phyc. Brit.). 



Order Cladophorace^. 

 TJrospora, Aresch. 



U. isogona, Batt. {= Conferva Youngana, Phyc. Brit.). 

 Ulothrix, Kiitz. 



U.Jiacca, Thur. { = Lyngbya Jlacca. Phyc. Brit.). 

 Chsetomorpha, Kiitz. 



C. melagonium, Kiitz. ( = Conferva melagonium, Phyc. Brit.). 



C. cerea, Kiitz. { = Co)if3rva cerea, PJiyc. Brit.), 



C. tortuosum, Kiitz. 



