726 
Transactions of the Society. 
G. impressulum Elfv. B., Hk. 
G. venustum (Breb.) Arch. L., C., Brandreth, Grisedale Tarn. 
var. hypohexagonum West. Kirk Fell. 
„ „ f. incrassata West. Sk. 
G. Meneghinii Breb. Very frequent. 
f. octangularis Wille. Frequent. 
forma. Fig. 14. Diam. zygosp. sine spin. 22-23 a, c. 
spin. 33-35 /a. Bn. 
f. Boldtii nob. [C. Meneghinii Breb. forma h. Boldt 
(Desmid. fr. Gronland, p. 13, t. i. fig. 15.)] Bt., Hk., 
common. 
G. obliquum Nordst. f. major Nordst. Hk. 
f. minor Nordst. Bn., Langdale. 
f. minima . 
Long. 11 /a; lat. 9 /jl; crass. 4 g. Fig. 15. H., Pike of 
Bliscoe. 
G. Begnesii Keinsch. B., Esth waite Water. 
C. cymatonotophorum sp. n. Fig. 23. 
C. parvum, tarn longum quam latum, modice constrictum, 
sinu aperto cum extremo obtuso ; semicellulae late subrectan- 
gulares, lateribus subtruncatis subretusisve, dorso truncato et 
quadriundulato ; a vertice visae ellipticae, in utroque latere 
papilla instructae ; a latere visae suborbiculares, medio utrobique 
papilla ornatae. 
Long. 13 -5-14 5 fi; lat. 13* 5-14* 5 /* ; lat. isthm. 
5*5-6 y , ; crass. 9*8 fi. Hk. 
This seems a very distinct species ; it has some resemblance in 
front view on first sight to G. Begnesii Keinsch. 
C. substriatum Nordst. Bn., Stye Head Tarn. 
*C. subnotabile Wille (Ferskv. Alg. fr. Nov. Sem., p. 36, tab. xii. 
fig. 16). Trough at Ambleside. 
G. crenatum Kalfs. Frequent. 
G. Nuttallii West. Bt. 
G. undulatum Corda. IT. 
G. monomazum Lund. B. 
G. tetraofhthalmum (Kutz.) Breb. Frequent. The zygospore 
was seen from Lake Side. 
var. Lundellii Wittr. Bo., Bn., R., C., Hk., Blea Tarn 
in Borrowdale. 
C. Brebissonii Menegh. W., Bo., Hp., B., S., C. 
forma erosa West. W., Hp., Bn., S., L., C., Bt. 
G. consider sum. Kalfs. Bo., B., L., C., Hk. 
G. Quadrum Lund. 
Long. 73 fju) lat. 70 gu ; lat. isthm. 28 fi. Bn., Hk. 
C. margaritiferum (Turp.) Menegh. H. (at 2400 ft.). B. 
Scawfell, Crummock Water. 
