VEGA-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 509 
= Hydrocera compressa Wallich (M. J. Vol. VTI, pag. 252, Pl. 
XIII, fig. 7—12). The structure of the valve consists of a 
coarse reticulation of large 5—7-gonal cells, 6 in 0,01 mm., 
and a finer decoration of small puncta arranged in lines radia- 
ting from the centre. Ends of the valve (in S. V.) destitute 
of the coarse reticulation. 
Anaulus birostratus Grun. (Van Heurck Syn. P1. OTII, fig. 
1—2). 
= Triceratwm (arcticwm var.?) formosum Btw. (A. Schm. Atl. 
Pl. LXXIX, fig. 2) 3—6-gonal varieties. 
T.: punctötum Btw. (M:; J> Vol IV, pag. 275, PE XVI 
fig. 18). 
= T. cinnamomeum Grev. (M. J. N.S. III, pag. 232, P1. X, fig. 12). 
T. Favus Ehb. 
T. Pentaerinus Wallieh (M. J. VI, pag. 249, Pl. XTI, fig. 
10—19). | 
+ T. elongatum Grun. (A. Schm. Atl. Pl. LYXX, fig. 12). 
= T. armatum RBoper (M. J. II, pag. 283). 
Hemidiscus cuwneiformis Wallich (Pritch. Inf. Pl. VTI, fig. 14 
and probably Fuodia Ceylanensis Leuduger pag. 62, Pl. VI, 
fig. 65). 
= Aulacodiscus orientalis Grev. (T. M. S. XII, pag. 12, Pl. 
ESS SA Sehm- Ati. PI XXNRIVT fg:2): 
+= B. Beeverie Johns. (Pritch. Inf. pag. 844, Pl. VI, fig. 5). 
This form has been distributed in Cl. and Möll. Diat. No 278 
as A. Comberi var. ceylanica Grun., according to the deter- 
mination of Grunow. I think nevertheless that it may be 
the A. Beeverige of Johns. 
= A. Macreanus: Grev. (T. M. S. X, pag. 23, Pl. II, fig. 4). 
Coscinodiscus radiatus Ehb. (A. S. Atl. P1. LX, fig. 6—7). 
C. excentricus Ehb. (A. S. Atl. LVIII, fig. 46). 
= C. denarius A. S. (Atl. Pl. LVTII, fig. 20—21). 
+ O. cocconeiformis A. S. (Atl. P1. LVTIII, fig. 25—28). 
C. mitidus Greg. (A. S. Atl. Pl. LVTIII, fig. 18). 
EC: sp ARIS-PRAKISSENIE, fig, 32: 
SKOL subnikis ER]BY (AC ST At P5 EMIL: fig) 14) 
= C. symmetricus (Grev.?) A. S. (Atl. P1. LVII, fig. 27). 
= Actinocyclus Ehrenbergii Ralfs (Prit. Inf. p. 834). 
+ A. tenellus Bréb. (Donkin M. J. I, pag. 7, Pl. I, fig. 16. 
A. moniliformis Ralfs? A. S. N. 5. D. III, fig. 31). 
+ A. subtilis Greg. - 
= Actinoptychus hexagonus Grun. (A. S. Atl. Pl. I, fig. 15). 
v. tenella A. S. 1. ce. fig. 16. 
