184 MR. W. WEST ON THE EEESITWATEIl 



Named in honour of Wra. Archer, the illustrious pioneer of 

 freshwater Algal work in Ireland. 



65. Staurastrum coxtroterstjjvt, Breb. (Balfs, Brit. Desm. 

 p. 141, tab. 23. fig. 3.) 



II. Sugar Loaf Mt. ; Adrigole ; Castletown. 



66. S. ACULEATUM, MenegJi., t*cos:u:osPiNOS(JM, Boerg. {Bidrag 

 til Bornh. Desm-Flora, p. 147, tab. 6. fig. 8). 



II. Carrantuohill. 



. 67. S. yestitum, Balfs. {Brit. Desm. p. 143, tab. 23. fig. 1.) 

 .. I. Ballynahinch; Arderry Lough; near Westport. — II. Upper 

 Lake of Killarney ; Adrigole ; Glengarriff. 



68. S. oxyaca^thum, Arch, in JPriteh. Infusoria, ed. 1861, 

 p. 742. 



Long, cum spin. 33-35 fi; long, sine spin. 28-29 /j, ; lat. cum 

 proc. 42-43 fi ; lat. isthm. 10-12 p. 



I. Ballynahinch ; Lakes, Clifden to Roundstone, and near 

 Recess; Derryclare Lough. — II. Croinagloun; Glengarriff; 

 Adrigole. 



69. S. Sebaldi, Beinsch. {Alg. Fl. p. 175, tab. 11. fig. 1-) 

 Forma trigona. 



I. Near Oughterard. 

 Forma tetragona. 



II. Carrantuohill. 



Yar. ORKATTJM, Nord. {Norges Desm. p. 34, tab. 1. fig- 1*0 

 I. Near Westport ; Derryclare Lough ; Arderry Lough. 



+70. S. Psetjdosebaldi, Wille. {Bidrag til Kunds. om Norges 

 Ferskv. Alg. p. 45, tab. 2. fig. 30.) tt*^ T AC£NSE, n ov. subsp. 

 (PI. XXIV. fig. 1.) 



S. mediocre, subduplo latius quam longius; semicellulae ob- 

 cuneatsB ad basin non inflatae, apicibus verrucis bifurcatis prseditae, 

 angulis superioribus productis in radium denticulatum rectu 

 bifidum ad apicem, cum verruca insigni ad basin intenore 

 radii; a vertice vis*e biradiatee ad centrum multum inflate, 



■ 



glabrae, apicibus eihibentibus spinam unam. ^ 



Long. 32-35 /x ; lat. 55-60 ^ ; lat. isthm. 11 \i ; crass, in med. 



18 ii. 



L Ballynahinch Roundstone. 



