ALG^E OF WEST IRELAND. 163 



Zygospore globosse, aculeis simplicibus longis munitae. 



Long. 42 /i ; lat. lad bas. semicell. 15 fi ; at. ad apic. 10 /i ; 

 diam. zygosp. 29 ^u ; long. acul. 10-12 yu. 



II. Cromagloun. 



This appears to me to be sufficiently distinct from C. palan- 

 ffitla, Breb. I have met with C. Cucurbita, Breb., in conjugation 

 from "West Yorks. (vide " Additions to Freshw. Alg. of W. 

 Yorks.," in ' Naturalist,' Aug. 1891, p. 246), and from the North- 

 east of Ireland ; the fully developed zygospores were globose and 

 without spines. 



This was only seen in zygospore, and the surrounding in- 

 separable debris prevented the cytioderm of the semicells from 

 being properly observed. The zygospore points to this being a 



Cosmarium, but the arrangement of the chlorophyll was not 

 seen. 



Compare with Penium adelochondrum, Elfv. 



102. CosMARirM Thwaitesii, Balfs. (Brit. Desm. p. 109, 

 tab. 17. fig. 8.) 



I. Lough Aunierin. — II. Sugar Loaf Mt. ; Carrantuohill. 



103. C. Kalfsii, Breb. in Balfs, Brit. Desm. p. 93, tab. 15. 



fig. 3. 



I. Near Ougbterard ; near Eecess ; Kylemore. — II. Croma- 

 gloun ; TorcMt.; Carrantuohill; Castletown. 



tForma MONTAKUM, Bacib. (Be nonn. Desm. Polon. p. 15, 

 tab. 1. fig. 4.) 



II. Carrantuohill. 



104. C. Cucumis, Corda. (Aim. de Carlsbad, 1835, p. 121, 

 fig. 27 ; Balfs, Brit. Desm. p. 93, tab. 15. fig. 2.) 



Zygospora? globosse, glabrae. 



Long. 54-57 /x; lat. 30-3 r , 

 zygospor. 25 fi . 



I. Lakes near Eecess ; Lakes, Clifden to Roundstone ; Lough 

 Aunierin (cum zygosp.), " "' ~ " '" *" 



Csragh ; Castletown. 



ttl05. C. (Pleurotjejuopsis) hibernicum, nov. sp. (PI. XXL 

 fig. 19.) 



C. (Pleurotceniopsis) magnum, diametro circiter duplo longius, 



diam. 



