— 10 — 



Rhiz. p. Ill, PI. 3, f. 6), from which it differs mainly in the form of 

 the spine. 



10 (r). 



25. R. calcar avis Schultze in Müll. Arch. 1858, p. 339, PI. 13, f. 5 — 10; 

 Peragallo, Monogr. Rhiz. p. 113, PL 4, f. 9, 10; Cleve, Diat. f. the Sea of 

 Java, p. 11 ; Atl. Plankt. Organismus, p. 339 ; PL f. the Ind. Ocean and 

 the Malay Archip. p. 22; Schröder, 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 remplacée! by the 

 variety, var. cochlea, mentioned below. 



1 (rr) — 10 (rr). 



Area: Along the Atlantic coasts of Europe, Africa and America; Mediter- 

 ranean, Malay Archipelago. 



R. calcar avis Schultze, var. cochlea (Brun) 

 Ostf. ms. ; R. cochlea Brun, Diat. foss. et pelag. 

 1891, p. 43, PL 19, f. 9; Peragallo, Monogr. Rhiz. 

 p. 113, PL 4, f. 11; Cleve, PL f. the lnd. Ocean 

 and the Malay Archip. p. 22 and p. 56, PL 8, f. 12; 

 Leuduger-FortmoreL 1. c. p. 36; de Wildeman, 

 1. c. p. 123. 



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. a lata. 



Fig. 5. Bhizosolenia calcar C)( , o,__* _ f> (rr) _ 1nm 



avis Schultze var. cochlea ^{n) - à{n) b(ir) iuh-j. 



(Brun) Ostf. (M). Area: Indian Ocean, Malay Archipelago. 



Fig. 6. Bhizosolenia Clevei Ostf. (^). 



