— 180 — 
Long. 25,5 w; lat. cum proc. 27,5 m2; Jat. isthm. 7,5 pu. 
In stagnant water in the jungle. 
Area (of type): Ubiquitous. 
93. S. inconspicuum Nordst. in Acta Univ. Lund. IX, 1873, p. 26, 
tI, fai. 
Long. 14; lat. 132; lat. isthm. 5,2 p. 
With the preceding species. 
Area: Europe, N. America, Siberia, Burmah. 
94, §, leptacanthum Nordst. in Vidensk. Medd. Naturh. Foren. Kja- 
benhavn, 1869, p. 229, t. IV, f. 46. 
Long. s. proc. 384, c. proc. 76; lat. s. proc. 19y, ¢. proc. 50 p. 
In muddy ricefields. 
Area: N. and S, America. Senegal. Ceylon. Siberia. 
Arthrodesmus Ehrenb. 
95. A. alatus West & G.S. West, n. sp. (Tab. nostr. Ill, fig. 283—25). 
A. parvus, circiter tam longus quam latus, profundissime con- 
strictus, sinu angusto-lineari extremo subampliato; semicellule late 
rectangularo-trapeziformes, angulis inferioribus subrotundatis, lateri- 
bus leviter concavis et sursum divergentibus, angulis superioribus 
leviter productis, subrotundatis cum spina brevissima minutissima, 
apicibus late retusis, nonnunquam spinis brevissimis minutissimis 
paucis 2—4 circa angulos superiores; a vertice visze ellipticee, polis 
apiculatis; membrana delicatissime punctata. ; 
Long. 25—31y; lat. bas. semicell. 20—95 »; lat. apic. semicell. 
23--27 1; lat. isthm. 4,4—7,54; crass. 12,5 p. 
Numerous examples of this species were obtained from amongst 
Utricularia’in a riverbed. They varied a little in their general form and 
proportions, but the chief variation was in the small spines round the 
upper angles of the semicells. The majority of specimens possessed only 
the apiculations at the upper angles, but others possessed a variable 
number (from one to four) of small spines arranged approximately in a 
ring round the angles. 
In outward form it cannot be mistaken for any other species of the 
genus. 
Hyalotheca Ehrenb. 
96. H. undulata Nordst. in Wittr. et Nordst. Alg. Exsicc. 1879 
no. 248. 
Long. 183—17 p; lat. 5,7—6,7 p. 
In stagnant water in riverbed. 
Area: Europe, N. America, India. 
’ 
