BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 5. N:o 8& 21 
DL. 0,26, Br. 0,085 m.m. This species is remarkable for 
its size, the membranaceous quality of its valves and the 
sculpture, resembling that of a Pleurosigma. 
I have found this species in a gathering from Honolulu 
and recently in the slide, sent by Mr. HABIRSHAW. 
B. Tuomeyi RoPEr. 
Triceratiwm Pentacrinus WaALLIOCH. 
Tr. dubiwum Brw. 
Tr. bicorne CL. 
Tr. orbiculatum SHADB. 
"Bluizosolenia styliformis Brw. Only a fragment. 
< Asterolampra Marylandica EuHB. (ÅA. impar. SHADB. 'T. M. 
Sockkpas CPL Ten 14): 
Pyzxidicula eruciata EEB. 
" Actinocyclus (2?) tenuissimus CL. N. Sp. Valve circular with 
a row of marginal puncta. Nodule marginal distinct. 
Sculpture very delicate, small cellulx arranged in lines, 
radiating from the centre. Diam. 0,04 m.m. to 0,08 m.m. 
Fig. 34. 302, 
Hemidiscus cuneiformis WaALLICH. 
There are consequently 196 different species of marime 
diastomacex known from the West Indian archipelago. This 
number will probably be increased by a closer examination 
of gatherings from different localities. 
The diatomaceous flora of the West Indies has a very 
strong resemblance to that of Honduras, known by the investi- 
gations of RABENHORST & JANISCH and GRUNOWw. Very intere- 
sting is the total absence of any species of the genus Aula- 
codiscus, which formerly lived in the West Indies and of 
which so many forms have been found in a fossil state on the 
Id. of Barbados. On the Pacific coasts of California, Central 
America, Peru etc., the genus Aulacodiscus occurs abundantly. 
