170 MR. W. WEST Otf THE FRESHWATEB 



Long, cum spin, 18 xx ; long, sine spin. 125 xx ; lat. cum spin. 

 18 xx ; lat. sine spin. 12*5 xx ; crass. 6'5 fi. 

 I. Ballynahinch. 



9. Arthrodesmus te^ttissimtts, Arch. (Babh. Fl. Europ. 

 Alg. iii. p. 226.) (PI. XXII. fig. 9.) 



I. Ballynahinch; Lough Aunierin. 



Specimens from Ballynahinch : 



Long, sine mucr. 8 xx ; long, cum mucr. 9 /x ; lat. cum spin 

 19 xx ; lat. sine spin. 9 xx ; long. spin. 5 xx ; lat. isthm. 5 /x. 



Specimens from Lough Aunierin : 



Long, sine mucr. 125 xx ; long, cum mucr. 14 /x ; lat. cum 

 spin. 32 xx ; lat. sine spin. 12*5 xx ; long. spin. 9*5-10 /x ; 

 isthm. 3*5 xx ; crass. 6 /x. 



As we are unable to understand the figures representing 

 vertical views of this species given in Cooke's Brit. Desmids, 

 pi. 47. figs. 3 d & 3/, we give a figure. Cooke's figures represent 

 it as being 105-12-5 xx long ; the dimensions given in the text 

 are 8*5 /x long. 



tlO. A.? glaucesce^s, Wittr. (Gotl. och 01. S'dtvat. Alg. 

 p. 55, tab. 4. fig. 11.) 



I. Ballynahinch; Derryclare Lough ; Crcggan Lough. 



ttForma convexa. (PI. XXII. fig. 10.) 

 F. paulo longior quam latum, minor apicibus convexis (nee 



lat. 



lat. 



retusis). 



Long. 12 /x; lat. sine spin. 10 xx; lat. cum spin. 12*5 //; 

 isthm. 5 /x ; crass. 65 xx. 



I. Creggan Lough. — II. Adrigole. 



1. Statjbastrum dejectttm, Breb. {Balfs, Desm. p- 1 - i ' 

 tab. 20. fig. 5.) 



I. Clifden ; Creggan Lough ; Lakes near Recess ; near West- 

 port ; Lough Shannacloontippen ; Oorid Lough ; Derryclare 

 Lough; Glendalough.— II. Lough Guitane; Glen Caragh; 

 Castletown ; Glengarriff; Lower Lake of Killarney ; near Loug 

 Brin ; Adrigole. 



ft Var. iKFLATUM, nov. var. (PI. XXII. fig. 11-) . . 



Var. multo major, semicellulis ellipticioribus et inflatis, spi 



brevioribus (extrorsum versis). 



Long, sine spin. 43 /x ; lat. sine spin. 52 /x ; lat. isthm. 1 /*• 



L Derryclare Lough ; Ballynahinch. 



