70 
NEW DIATOMS. 
Var. y, interrupta , keel bars lengthened and interrupted two or 
three times. Colon, F. K. 
19. N. (Perrya) Grundleri. Grim. — Resembles N. Weissjlogii , 
but the valve seems more excentric and is covered with parallel 
transverse punctate striae, 12-14 in . *01 mm. The valves, which 
are more or less constricted in N. Weissjlogii are straight in N. 
Grundleri. Campeche Bay, Da Gfriindler ; Colon, Kitton. 
The forms composing my genus Perrya, of which P. pulcherrima 
is the type, differ widely from the nitzschice in the structure of the 
frustule. A figure of the frustule is given in the M. M. J. vol., 
and an ideal section of the valve, the latter is incorrect. I have 
since succeeded in obtaining a correct outline ; the valves in Plate 
120, Fig. 5, Figure 2, are reduced copies of a camera lucida draw- 
ing. Fig. 1 is also a reduced copy of a camera lucida drawing of 
the s. v., as seen at about a, Fig. 2. The granules are irregular in 
outline, and slightly hispid, by very careful focussing the extreme 
edge of the valve may be seen. 
Fig. 3 is a diagramatic section of a frustule of Nitzschia grandis. 
— F. K. 
20. Tryblionella Lanceola. Grim. — Valves lanceolate, costae 
strong, pervious, 10 in. *01 mm. L. *05 mm. St. Thomas. 
(In Cleve’s figure the costae are represented in pairs, which 
gradually approach each other until they unite at the centre of the 
valve. — F. K.) 
21. Denticula ? Antillarum. Cl. & Grun. — Valves lanceolate, 
with acute ends. Costae 7-12. Spaces between the costae, with 
irregularly scattered puncta. L. 'Ob-’OGS mm. Not very rare in 
the St. Bartholomew gathering ; it also occurs in brackish mud 
from Santos, Brazil. (Judging from the figure, I think this form 
may be a species of M. Petit’s Trachysphenia. “ Fonds de la 
Mer,” Vol. iii., pi. v-, fig. 19.) 
22. Grammatophora macilenta var.?) caribaea. Cl. — Valve with 
distinctly gibbous centre and ends. Septae straight. Striae fine, 
28 in. *01 mm., distinctly punctate. Virgin Island (common). 
23. Triceratium Campechianum. Grun. in “ Litt." — No des- 
cription is given by Prof. Cleve of this beautiful little species, and 
his figure is copied from a photograph. It occurred somewhat 
plentifully in the Campeche Bay gathering. I also found one or 
two valves in that from Colon. The following are its specific 
characters : — 
Valves polygonal (8-10 angles), processes on the alternate 
angles, cellules hexagonal, usually largest at the centre, diameter 
*70-*107 mm. Campeche Bay. The 8-angled var. I found in some 
washings of Alga? from Barbadoes (one specimen only), diameter 
•62 mm. The cellules resemble those in T. Favus. — F. K. 
24. T. (or Biddulphia) bicorne. Cl.— Valve rhombic, two of the 
opposite angles much produced, upon which the processes are situ- 
