142 ME. W. WEST ON THE FRESHWATER 



Compare with Cosmarium nasutum, Nord. (Desm. Spetsb. 



p. 33, tab. 7. fig. 17). 



1. Cosaiarifm quadratum, Rolfs. {Brit. Besm. p. 92, tab. 15. 



fig. 1.) 



Long. 50-52 yu; lat. 30/*; lat. isthm. 12-13 /x. 



1. Near Westport ; Lakes, Clifden to Roundstone ; Lough 



Aunierin. — II. Carrantuohill. 



2. C. plicatum, Reinsch, ffvar. Hibersticum, nov. var. 

 (PL XXIV. fig. 9.) 



Var. leviter constricta infra, apicibus convexis, membrana 

 punctata. 



Long. 90 fx ; lat. 47 lx ; lat, isthm. 18 li. 

 II. Carrantuohill. 



3. C. siNuosTJM, Lund, fvar. decedens, Reinsch. {Nord. 

 Desm. Arct. tab. 8. fig. 41.) 



II. Carrantuohill. 



f4. C. tatricum, Racib. {Be nonnul. Besm. Polon. p. 22. tab. 1. 

 fig. 12.) 



4 



ft Var. sph^ruliferum, bov. var. (PI. XX. fig. 11.) 



Var. major quam forma typica ; semicellulse granulis 10 levibus 

 (sed distinctis), cum 7 intra ambit um regulariter dispositis, tribus 

 reliquis prope isthmum ; cellulse a latere conspectse distincte 

 constrictse. 



Long. 45/x; lat. ad bas. semicell. 25 /*; lat. ad apic. 18*5 ll ; 

 lat. isthm. 15 ll ; crass. 14 ll. 



I. Lough Shannacloontippen. 



In having the lateral view constricted it agrees with the var. 

 novizelandicum, Nord. (Fr. "Wat. Alg. of New Zeal, and Austr. 

 p. 56, tab. 6. fig. 6), which is also larger than the type. 



5. C. NYMAraiANTJM, Grun. inRabh. Fl.Europ. Alg. iii. p- 1 66 - 

 I. Oorid Lough.— II. Glen Caragh; Castletown ; Lower Lake 



of Killarney. 



6. C. Hammeri, Reinsch. (C. homalodermuin, Nord.) 

 Long. 50//; lat. 35 li; lat. isthm. 13 ll. 



I. Creggan Lough ; Derryclare Lough ; Clifden ; Lakes, 

 Clifden to Eoundstone ; Lough Aunierin ; Nacoogarrow Lough ; 

 Boy Lough. 



