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Odontidium mutabile genuinum Grun. 
Flagiogramma tessellatum Grev., rare. 
Pleurosigma eximium (Thw.) Grun. and Cl. 
P. Sctotoense Sulliv. 
P. Spencerit (Quek.) W. Sm. 
Polymyxus coronalis L. W. Bail. 
Pseudauliscus radiatus Bail. 
Pseudocunotia fiexuosa (Breb.) Grun. 
Rhaphoneis amplaceros Ehr. 
R. Belgica Grun. 
R. gemmifera Ehr. 
R. Rhombus Ehr. 
Stauronets acuta W. Sm. 
S. gracilis Ehr. 
S. Phoenicenteron Ehr. 
Surirella angusta Kiitz. 
S. diseriata (Ehr.) Breb. 
S. cruciata A. Schm. 
S. crumena Bréb. 
S. elegans Ehr. 
S. Febigerti Lewis. 
S. oblonga Ehr. 
S. ovalis Bréb. 
S. ovalis ovata (Kiitz) V. H. 
S. splendida Ehr. 
S. striatula Turp. 
S. fenera Greg. 
SURIRELLA WooLMANIANA Peticolas, n. sp. 
Mr. Peticolas, who discovered several specimens, remarks that 
it differs from S. Gemma, of which I had at first considered it a 
variety, in “ size, outline, areolation and the hyaline centre.” 
Valves broadly obovate, rounded at both ends ; costae slightly 
twisted, not reaching the median line, thus forming a pseudoraphe 
broadening at the centre. Costae and intercostate striae much 
more robust than in .S. Gemma. It somewhat approaches certain 
varieties of S. striatula. 
Synedra delicatissina W. Sm. 
S. investiens W. Sm. 
Terpsinoe Americana (Bail.) Ralfs. 
