128. 
129. 
130. 
3: 
132. 
133. 
134. 
135. 
136. 
137. 
138. 
139. 
140. 
141. 
142. 
143. 
144. 
BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 5. N:O 8 15 
Podosphenia angustata Grus. (Verh. 1862 pag. 347 Pl 
6 fig. 20) St. Bartholomew, frequent. 
P. ovata W. Su. (Syn. Pl. 24 fig. 226) St. Bartholomew, 
rare. 
Isthnia enervis EHB. St. Bartholomew. 
Biddulphia Baileyii Sm. (Syn. Pl. 62 fig. 322) St. Bar- 
tholomew, rare. 
B. turgida Euz. (B. gramulata RBoper. T. Micr. Soc. VII 
PASS JAR fETOESNRL 2 fSIS Bartholo: 
mew, rare. 
B. longicruris Grev. (Mier. Journ. VII pag. 163 Pl. 7 
fig. 10) St. Bartholomew, rare. 
B. Tuomeyi Rorrr. (T. Micr. Soc. VII Pl. 1 fig. 1—2. B. 
tridentata EHB. M. G. 1856 PI. 18 fig. 52, Pl 21 fig. 24). 
Virgin Ids., not rare. 
B. aurita (EHB.) Brå. Virgin Ids. St. Bartholomew. 
B. (aurita var.?) Roperiana Grev. (Mier. Journ. VII 
pag. 163 P1. 8 fig. 11—13) Virgin Ids., not rare. 
B. pulchella Gray. Virgin Ids. St. Bartholomew, abundant. 
Cerataulus levis (EHB.) Puerto Rico, Arecibo River; St. 
Martin, in fresh water. 
C. Smithii BRarres. (Eupodiscus radiatus W. Sm. B. Diat. 
II pag. 24 P1. 30 fig. 255) St. Bartholomew. 
C (?) Reichardtii Grus. (Verh. 1863 pag. 158 PI. 13 fig. 
22) Virgin Ids., very rare, only one specimen observed. 
Biddulphia (? Terpsinoö ?) birostrata GRUS. (Verh. 1863 
pag. 158 Pl. 13 fig. 23). Virgin Ids., St. Bartholomew, 
rare. I have seen many specimens of this little form in 
a gathering from the Balearic Islets, also some specimens 
in Monterey Stone. GRUNOW found this diatom on Macro- 
cystis from Peru. The outline varies greatly. The ends 
are not always cuneate, as on the fig. given by GRUNOW, 
but often rounded. The valves are perfectly plane, and 
in consequence the frontview has parallel margins. This 
diatom is nearly related to Plagiogramma and Terpsinoé. 
Triceratium armatum Rorer. (Mier. Journ. II, pag. 283. 
BW. Mier. Journ. IV pag. 274 fig: 9) Virgin Ids., rare: 
T. Favus EHB. Virgin Ids., St. Bartholomew. 
T. Pentacrinus WarricH. (Mier. Journ. VI pag. 249 
P1. 12 fig. 10—14. Amplupentas alternans JAN. & RABH. 
Hond. Pl. 1 fig. 1 Amplatetras ornata SHADB. Micr 
