511 
C. subcrenatum Hantzsch v. divaricatum Wille. Forma crenis la- 
teralibus siib-bidentulatis, et granulae semicellularum in series 3 ver- 
ticales dispositae. 
C. Nuttallii n. sp. p. 151, t. XXI, f. 5, C. mediocre, diametro cir- 
citer 1 Ygplo longius, modico coastrictum, sinu sublineari et intror- 
sum ampliato; semicell. subseraiorbiculares, angulis inferioribus sub- 
rectangularibus in ambitu (10) undulatae, granulis 4 intra utrumque 
marginem lateralera (uno sub utraqne duarurn inferiorum undularum 
et duobus sub undula tertia de basi), et 4 ad apicem (uno utroque 
parvo sinui, quarto infra granulum centralem); a vert. visse subel- 
liptica3, polis truDcatis leviter tetraundulatis, medio inflatae; a lai 
vism quadrato-ovales, apice tetraundulatae , inflatse versus basin; 
istbmus a vert. visse oblongo-truncatus ; mernbr. dense et minute 
punctata, medio Isevi et incrassata; pyrenoid. binis. Dim. celi. 45^ 
32vl6, 11 y.; crass. 23 
Ist sehr wenig von C. subundulatum Wille verschieden. 
C. Brebisonii Menegh. f. erosa pag. 152. tab. XXI, fig. 6. F. 
dorso subglabrato et subtruncato. Dim. celi. 95^^70^25 [x.; crass. 
47,5 f... 
C. conspersum Ralfs v. subrotundatum n. v. p. 152, t. XXI, f. 7. 
Var. angulis superioribus semicellularum rotundatioribus quam in 
var. rotundato Wittr.; granulis niimerosioribus in series horizonta- 
les (circ. 12) , in series verticales (circ. 21) ordinatis. Dim. celi. 
84 « 82 w 30 [Ji.; crass. 42 ix. 
C. sphderoideum n. sp. p. 153, t. XXI, f, 8. C. mediocre, diame- 
tro IV 2 PR longius, profonde constrictum, sinu angusto introrsum 
fere ampliato; semicellulse late ovales et subcomplanatse ad basin; 
granulis magnis in quincuncem ordinatis (circ. 11 obliquis seriebus); 
a vert. conspectse ellipticse; a lat. visse subrotundse ; pyrenoid. binis. 
Dim. celi. 63^ 38 V 10-14 (x.; crass. 27 [x, 
C. subpunctulatuìTi Nordst. v. BoergeseniI n. v. (C. subpunctula- 
tum f. Borges. Bornli. Desrn. p. 144, t. 6, f. 4) p. 154, t. XXI, f. 9. 
Granulis validioribus, iis (circ. 8) ad medium submajoribus, seriebus 
transversis duabus, apicibus distincte sed minute granulatis. Dim. celi. 
29^^ 28 ^ 9 u. 
Ist mit Bòrgesens Form, was die Form der Zellhàlften betrifft, 
nicht vollstàndig ideatiseli. 
C. Arnellii Boldt f. compressa p. 154, t. XXI, f. 10. F. parvior 
relative latior quam f. tjp., seriebus transversis granulorum validio- 
ribus et propioribns basi se nicellularum. Dim. celi. 42^37^16 [x. 
