67 
NEW DIATOMS. 
By Professor P. T. Cleve. with Notes by F. Kitton, 
Hon. F.R.M.S. 
Professor P. T. Cleve, in a paper communicated to the Royal 
Swedish Academy of Sciences (Vol. v., No. 8, 1878), has figured 
and described the following new species of Diatomacese. These 
forms, Herr Cleve informs us, were principally obtained during his 
travels (in 1868) in the West Indian Archipelago, from the Virgin 
Islands, and along the shores of St. Bartholomew. Those tyom 
Campeche Bay are figured and described by permission of Herr 
Grunow, of Vienna. 
The number of species identified in these gatherings amounts to 
177, of which 25 are considered by the author to be new. 
1. Navicula Virginea. Cl . — This form varies somewhat as to 
outline, being often slightly constricted at the centre. Apices pro- 
duced. Median pores* approximated. Strias very fine, only 
visible in balsam-mounted specimens, by oblique light. The striae 
are parallel, and not interrupted. This form seems to be closely 
allied to N . Janischiana , Rab. Virgin Islands (not rare). 
2. N. Regula. Grun , Cl. — S. V. rectangular, with parallel 
margins. Striae coarse, radiant, reaching median line, abbreviate 
in the middle, about 7 in '01 nun. Median pores somewhat dis- 
tant, median lines almost straight. Length *0884 mm., breadth 
*0136 mm. Virgin Islands. Campeche Bay. Herr Grunow. (Pro- 
fessor Cleve thinks it may possibly be a var. of N. rectangulata , 
Greg. I have seen the Campeche Bay form, and do not observe 
any specific distinction to warrant its separation from Gregory's 
species. — F. K.) 
3. N. St. Thoznse. Cl. — Valves undulate, apices produced, striae 
coarse, radiant, marginal, shorter as they approach the central 
nodule, 5-6 in. L. -01 mm., *061 mm., B. *0255 mm. This form, 
according to Herr Grunow, is allied to his N. Botteriana. Virgin 
Islands (one specimen only). 
4. N. Bartolomei. Cl. — Valves strongly constricted at the 
middle ends, cuneate. Sculpture ; large parallel costae, not 
reaching either margin or median line. Short round the central 
nodule. The margins have a small row of small granules, L. *075. 
St. Bartlolomew. (Herr Cleve thinks this may be identical with 
my N. Ptrryana. T. M.S., 1873, with which I am inclined to 
concur. — F. K.). 
5. N. formicina. Grun. in “ Litt." — Valve composed of two 
rhombic halves, connected by a very narrow isthmus, which is 
slightly enlarged in the middle. Striae parallel, not reaching the 
* By median pores is meant the nodules or openings which terminate the 
median lines, more or less near the centre of the valve. 
