ALGJE OF WEST IRELAND. 165 



3. Xakthidium fasciculatum, JEhrenb. (Ralfs, Brit. Desm. 

 p. 114, tab. 20- fig. 1.) 



I. Derryclare Lough ; Ballynahinch ; Lakes near Becess. 



4. X. antilop^um, Kuetz. {Cooke, Brit. Desm. p. 132, tab. 46. 



fig. 2.) 



I. Creggau Lough ; Ballynahinch (cum zygosp.) ; Lough 

 Aunierin ; Derryclare Lough ; Baheh Loughs. — II. Muckross ; 

 Upper and Lower Lakes of Killarney ; near Lough Brin ; Adri- 

 gole ; Glen Caragh ; Castletown ; Grlen garriff. 



An inchoate form of this was very frequently seen from Derry- 

 clare Lough, a figure of which is given (PI. XXII. fig. 2). It 

 differs from the type in having fewer spines, one semicell having 

 but two spines, one on each inferior angle, the other semicell 

 having four spines, two at each of the inferior angles, and one 

 imperfect one at one of the superior angles ; all the spines being 

 less robust than normal, and arranged in the median plane of the 

 lateral view. Compare with X. incTioatam, Nord. (Fr. Wat. 

 Alg. of New Zeal. & Austr. p. 45, tab. 4. fig. 30). 



Long. 47 /i: lat. sine spin. = long. ; long. spin. 10 /i ; lat. isthm. 

 12'5/x ; crass. 30 /i. 



5. X. ceistatum, Breb. in Balfs, Brit. Desm. p. 115, tab. 19. 

 fig. 3. 



I. Near Westport ; Lough Aunierin ; Ballynahinch ; Creggan 

 Lough ; Lakes, Clifden to Eoundstone ; Derryclare Lough. 

 II. Muckross ; Glengarriff. 



tfForma angulatum. (PI. XXII. fig. 3.) 

 Forma distincta angularis, spinis rectis ad angulos et lnem- 

 brana punctata. 



Long, sine spin. 51 /i; lat- cum. spin. 62 fx ; lat. sine spin. 



40-43 a : lat. anic. 22 a : lat. isthm. 12*5 u : crass. 225 u. 



I. Lough Aunierin. 



I. Ballynahinch. 



BaJft 



Var. spinulifebum, West. (Fr. Wat. Alg. of N. Wales, 

 p. 291, tab. 5. fig. 21.) 

 I. Lough Aunierin. 



