947 
apice truncato paullum dilatate basi tumoribus binis utroque 
margine instructae, a vertice vise elliptice ambitu undulato-cre- 
nate in utroque latere crenis quinis. Membrana fuscescens pun- 
ctata. Lobi polaris latitudo triens diametri transversalis semi- 
cellule. 
Long. 0,0049" — 125 gu. Lat. 0,0098" — 714 p. — Lat. 
lob. pol. 0,001" — 26 pg.  Crass. 0,0014" — 35 p. 
Proximum est Euastrum intermedium Cleve (Bidrag. p. 484, 
t. IV, f. 1), quod differt lobo polari magis dilatato et tantum 
binis tumoribus centralibus semicellule (saltem in Speciminibus 
prope Jónkóping Svecie a me lectis). — Euastrum insigne Hass. 
lobum polarem e vertice visum quadrilobulatum habet, E. inter- 
medium et E. latipes bilobulatum. 
5. E. abruptum n. sp. "Tab. II, fig. 3. 
E. mediocre, diametro subduplo longius, incisura mediana 
lineari angusta, in sectione transversa rectangulare, medio paul- 
lum tumidum utroque polo retusum; semicellula centro tumore 
parvo paucis granulis ornato, trilobz, lobis lateralibus e basi 
paullum remotis brevibus horizontalibus apice truncato-rotundatis, 
lobo polari apicem versus paullo dilatato truncato, inciso-bifido 
angulis exterioribus in spinas breves oblique sursum versas acu- 
minatis, e vertice viso rectangulari, angulis basalibus et margini- 
bus loborum granulato-margaritaceis , a latere vise ovales apice 
retuse. — À fronte visum habitu fere E. pulchelli Bréb. List. d. 
Desm. f. 54 
Long. 0,0021—3^ — 55— 59 pu. Lat. 0,00443—145" — 
93—37 u. Crass. 0,0087" — 22 y. 
6. E. rostratum Ralfs in Ann. Nat. Hist. v. 14, p. 192, 
t. VIL, f. 5. 
Long. 0,0031" — 76 g. Lat. 0,0024" — 54 g.  Crass. 
0,0014" — 36 y. 
ie. calis indie (Turp.) Ralfs in Ann. Nat. Hist. v. 14, p. 193; 
Heterocarpella binalis Turp. Dict. d. Sc. Nat. 4820 sec. Ralfs 
Br. Desm. 
