998 10 
Rhiz. p. 11, Pl. 3, £6), from whieh it differs mainly in the form of 
the spine. 
LO (1). 
25. R. ealear avis Schultze in Miill. Arch. 1858, p. 339, Pl. 13, f. 5—10; 
Pevagallo, Monogr. Rhiz. p. 113, Pl. 4, f.9,10; Cleve, Diat. f. the Sea of 
Java, p. 11; AU. Plankt. Organismus, p. 339; Pl. f. the Ind. Ocean and 
the Malay Archip. p. 22; Schroder, Neapel, p. 26. 
The type has been found in a few specimens, which are quite like 
the specimens from the North Sea, but commonly it is remplaced by the 
variely, var. cochlea, mentioned below. 
L (vr) — 10 (rr). 
Area: Along the Atlantic coasts of Europe, Africa and America; Mediter- 
ranean, Malay Archipelago. 
R. calear avis Schultze, var. cochlea (Brun) 
Ostf. ms.; R. cochlea Brun, Diat. foss. et pelag. 
L891, p. 43, Pl.19, £9; Peragallo, Monogr. Rhiz. 
p. 113, Pl. 4, f. 11; Cleve, Pl. f. the Ind. Ocean 
and the Malay Archip. p. 22 and p.56, PI.8, f.12; 
Leuduger-Fortmorel, 1. ¢. p. 36; de Wildeman, 
Ics WelQs: 
Cleve has figured a fragment of a frustule 
showing numerous, small chromatophores grouped 
in oblique or spirally twisted bands, but the 
rather numerous specimens which I have seen, 
had the small chromatophores in more or less 
distinct longitudinal bands. I consider it a variety 
of R. calcar avis, corresponding to the var. indica 
of R. alata. 
ahs aS MET CRNC 
oh ae I TEE Se AO lee 
(Brun) Ostf. (22°). Area: Indian Ocean, Malay Archipelago. 
Vig. 6. Rhizosolenia Clevei Ostf. (222). 
