utrimqus qgaullo dilatate habitu nasi (unde nomen specifi- 
cum); a vertice vis® elliptice, medio vix inflate, granulat«, 
in centro granulis nullis, Corporis cerassitudo dimidium, 
latitudo isthmi fere triens diametri longitudinalis, 
Long. 0,0014—16” 35—40 u. Lat. 0,0011-13° = 
28-33 u. Crass. 0,00065° = 16 «. Lat, isthmi 0,0005” 
a 23 u. 
©. protumidum n. sp. 
C. submediocre, fere tam latum quam longum, subquad- 
ratum medio constrietum, sinu lineari; semicellulee dorso 
late truncato producto quasi trilobe, lobis lateralibus sinu 
subrectangulo e lobo polari, brevi, paullum dilatato, margine 
apicali subtiliter quadricrenato (crenis binis intermediis 
minoribus), discretis, sinu brevi bilobulatis, angulis inferiori- 
bus subrectis, ceteris obtusa rotundatis, marginem versus 
et in ipso margine muricato-granulat®, tumore basali eleva- 
tissimo, granulato, granulis concentrice positis, predit®; a 
vertice vis® late elliptice, medio utrimque tumore valde 
prominente, obtuso, utroque polo granulats, in centro gra- 
nulis nullis; e latere rectangulares tumore basali magno, 
apice truncate vel leviter retuse. Latitudo isthmi dimi- 
dium (vel pallo major), lat. lobi polaris tres partes, crassi- 
tudo corporis ger partes diametri transversalis. Nuclei 
amylacei singuli (saltem in a et ß). 
* subplanum nov. subsp. Tab. VII, f. 22, 
C. mediocre, diametro tertia parte longius, medio con- 
strietum sinu lineari; semicellule dorso late truncato pro- 
ducto quasi trilobs, lobo polari brevi (paullulum dilatato), 
margine apicali quadricrenato (crenis fere conformibus), lobis 
lateralibus sinu brevi bilobulatis, lobulo superiore adscen- 
denti, breviore, obtuso, inferiore truneato-rotundato vel leviter 
retuso, marginem versus et in ipso margine muricato- gra- 
nulatse, tumore basali, minus elevato, seriebus granulorum 
eireiter 7 verticalibus, minus distinetis, ornat®e; e vertice 
vis® elliptice medio vix inflate, in centro granulis nullis; 
e latere conspecte ovat® apice lato truncatse vel retus=. 
Nuclei amylacei...... . Latitudo isthmi dimidium, lat. 
marginis terminalis tres partes diametri transversalis cor- 
poris. Crassitudo fere dimidium diametri longitudinalis. 
Long. 0,0019 - 21” = 48—54 uw. Lat. 0,0014—15” — 
36—38 u. Crass. = marg. term. — 0,001” = 26 u. Lat. 
isthmi 0,0007 = 18 u. 
Ü tumens n. sp. Tabel. VII, f. 2g. 
C. mediocre, circiter tertia parte longius quam latius, 
ineisura acutangula mox valde dilatata; semicellule late 
