8 
Transactions of the Society. 
parvorum intra ambitum totius, in medio glabrae (vel levissime 
punctulatae) ; a vertice visae ellipticae ; a latere visae quadrato- 
rotundae. 
Zygosporae globoso-angulares, spinis tenuibus profnnde 
bifurcatis vel trifurcatis (in ambitu 7) ornatae. 
Long. 20-22 ya ; lat. 17-5-19 ya ; lat. isthm. 5 • 7 ya ; crass. 
9-9*5 ya; diam. zygosp. sine spin. 23-25 ya; cum spin. 40- 
42 ya. 
Hah. Orkney Is., amongst Sphagnum (E. Naylor). 
The nearest species to this is C. sphalerostichum Nordst. in Nordst. 
et Wittr., Desm. et CEdog. in Ital. et Tyrol, p. 29, tab. xii. f. 3, from 
which it differs in its subundulate apices, in the centre of the semicells 
being glabrous (or more rarely minutely punctate), in its angular 
lateral view, and in its spiny zygospore. 
C. asperuh sp. n. [ = C. scabrum West in litt. 1891 ; non Turn.] 
Fig. 21. 
C. parvum, diametro lj-plo longius, modice constrictum, 
sinu angusto-lineari ; semicellulae quadrato-pyramidatae, utro- 
bique 4 yerrucis truncato-emarginatis, emarginatae ad apicem 4 
verrucis minoribus, iis ad angulos emarginatis, 2 seriebus 
transversis granulorum ad basim, reliquiis granulorum suR 
regularibus ; a vertice visae oblongo-ellipticae, ambitu profunde 
crenato, subinflatae ad medium utrobique, annulo granulorum 
intra marginem et granulis perpaucis intra annulum, seriebus 
3 transversis granulorum polos versus ; a latere visae pyrami- 
dato oblongae, lateribus rectis scabris, 4 seriebus transversis 
verrucarum subquadratarum, apicibus granulatis convexis. 
Long. 45 fi] lat. 31 /a; lat. isthm. 12*5 ya ; crass. 
13-5 ya. 
Hob. New Galloway, Kirkcudbright, Scotland (J. M‘An- 
drew). 
Compare with C. nasutum Nordst. (Desm. Spetsberg., p. 33, tab. 7, 
fig. 17). 
C. thwaitesii Kalfs, Brit. Desm., p. 109, tab. xvii. fig. 8. 
var. Scoticum var. n. Fig. 15. 
Yar. major, semicellulis inflatis. 
Long. 95 ya ; lat. 42*5 ya ; lat. 36 ya. 
„ 97 ya ; „ 43-5 p ; „ 37*5 ya. 
Hab. New Galloway, Kircudbright, Scotland (J. M‘ An- 
drew). 
Genus Xanthidium Ehrnb. ; Raffs. 
X. ANTiLOPiEUM (Breb.) Kiitz. var. keve Schmidle (Beitrage zur 
Algenfl. des Schwarzw. u. der Rhein., p. 27, t. iv. f. 7). 
forma irregularis. Fig. 44. 
Forma paullo major, spinis obtusis et subirregulariter 
dispositis ; membrana glabra vel levissime punctata. 
