] 46 MB. W. WEST ON THE ERESHWATEll 



26. Cosmarium eectangflare, Gnin. in Babh. Fl. Europ. 

 Alg. iii. p. 166. [C. gotlandicum, Wittr. in Gotl. och 01. 

 Sot v. Alg. p. 60, tab. 4. fig. 14.] 



I. Ballynahinch ; Nacoogarrow, Shindilla, Derryclare, and 

 Letereen Loughs ; Glendalough ; Nabincka Lough. — II. Glen 

 Caragh ; Carrantuohill : Adrigole ; Castletown ; 8 m. S. of 



Ken mare. 



27. C. bioculatum, Breb. in Kalfs, Brit. Beam. p. 95, tab. 15. 



fiir.5. 



D 



I. Near Recess ; Creggan Lough ; Roundstone ; Ballyna- 

 hinch. — II. Lower Lake of Killarney ; near Lough Brin ; Mal- 

 low ; Carrantuohill. 



28. C tiisctum, Ralfs. {Brit. Besm. p. 95, tab. 32. fig. 7.) 

 Long. 10-13 ft ; lat. 7'5-9 li ; lat. isthm. 4'5 li ; crass. 5 ^ ; 

 diam. zygosp. 11-13 li. 



I. Ballynahinch; Roundstone (cum zygosp.) ; near Westport ; 

 Clifden; Lough Shannacloontippen : Derryclare Lough; Nacoo- 

 garrow Lougb. — II. Upper and Lower Lakes of Killarney; 

 Adrigole; Cloonee Lough; near Lough Brin; Glengarriff ; 

 Mallow. 



rL, 



ft29. C. succisum, nov. sp. (PI. XX. figs. 22, 23.) 



C. parvum, tarn Ion gum quam latum, modice constrictum, sinu 



aperto cum extremo angusto et brevi ; semicelluhe elliptico- 



hexagonse, apice late truncatae (nohnunquam subconcavo); a 

 verticevisae subellipticae, medio leviter subtumidse; a latere visae 

 circulares ; membrana lsevis et fere rufescens ; pyrenoidibus 



singulis. 



Long. 10-12-5 li ; lat. 11-12*5 li ; lat. isthm. 3'75-5/x ; crass. 6 fi. 

 I. Clifden ; Creggan Lough ; Derryclare Lough. 



(D 



13) 



smaller size, its different sinus, its relatively greater length, and 

 in the slight central swelling cf the vertical view. It differs 

 from C. pseudobiremum, Boldt. (Siber. Chlor. tab. 5. fig. 6), in 

 having the apex more truncate, in the less swollen middle of the 

 end view, in the different sinus, as well as # in its smaller size. 



30. C. pygmjeum, Arch. [Sphserozosma pygmaunn, Babh. Ft. 

 Europ. Alg. iii. p. 150.] (PL XX. fig. 24.) 



