I'ENIOl. ( .."> 



SCOTLAND. Sutherland! . Ross!, Aberdeen, Kincar- 

 dine, Forfar ! , Perth ! , Argyll, Renfrew (li'oi/ A; 77 As*'-//). 

 Ayr! Kirkcudbright! Harris, Outer Hebrides! 



V <_> 



IKELAXD. Lakes near Recess and Ballynahinch, 

 Galway ! Castletown and Carrantuohill, Kerry ! 



Forma minor AVest & G. S. West. (PL IX, fig. 10.) 



Penium cucurlitinum forma minor West & G. S. West, New Brit. Freshw. 

 Alg. 1894, p. 4 ; Eoy & Biss. Scott. Desm. 1894, p. 251. 



Rather smaller than the average : length -50-58 /u ; 

 breadth 22' 5-2 5 /i. 



SCOTLAND. Craig-an-Lochan, Perthshire ! 

 Geogr. Distribution. Siam. Brazil. 



Forma major forum nor. (PI. IX, fig. 17.) 



Rather larger than the average: length 98-1 00 /it; 

 breadth 34* 5-3 7 /a. 



SCOTLAND. --Tarbert, Harris; Near Balallan, Lewis, 

 Outer Hebrides ! 



Var. subpolymorphum Nordst. (PI. IX, figs. 19, 20.) 



Penium cucurliitinum var. subpolymorphum Nordst. Freshw. Alo - . N. Zeal. 

 1888, p. 71, t. 7, f. 20 ; West, Alo-. N. Yorks. 1889, p. 291 ; Mask. Further 

 Notes N. Zeal. Desm. 1889, p. 27, t. 5, f . 50 ; Ltitkem. Desm. Attersees, 

 1893, p. 544 ; West & G. S. West, Alga-fl. Yorks. 1900, p. 47. 



More attenuated towards the apices than the typical 

 form ; apices subtruncately rounded ; cell-wall densely 

 and minutely punctate. 



Zygospore quadrate with rounded angles and straight 

 sides; cell- wall lamellose. 



Length 71-8(5 n; breadth :52'5-38 n ; breadth of 

 isthmus 32-35 /it; breadth of zygosp. 60-70 /. 



ENGLAND. Mickle Fell, N. Yorks ! 



. Distribution. Austria. New Zealand. 



Lutkemiiller's Austrian specimens of this variety were 

 larger than either the English or New Zealand ones ; lie 

 gives as liis measurements : length 96-100 /u breadth 40- 

 42 f.i breadth of constriction 36 /u. 



