494 CLEVE, DIATOMS. 
Mastogloia acuta Grun. in litt. — Lanceolate, with produced 
ends. Rows of loculi at a little distance from the margin; 
loculi larger in the middle than near the ends. Strie parallel, 
very fine (not counted) punctate, puneta forming longitudinal 
lines. Length 0,04 mm. Breadth 0,015 mm. — P1. 35, fig. 8. 
Mr. Grunow sent me some years ago a sketch of a new 
Mastogloia, called acuta, which resembles this form so much 
that I suppose they are identical. The M. acuta Grun. has 
the loculi more separate from the margins than the Labuan- 
specimens and the fine strize (30 in 0,01 mm.) more radiant. 
M. laminaris (Ehrb.) Grun. — Lanceolate, with produced 
ends. Loculi large, 41/5 in 0,01 mm. marginal. Strice fine, 20 
—24 in 0,01 mm., not interrupted, reaching the median line.- 
Length 0,03 mm. Breadth 0,01 mm. 
The determination is made by the aid of a sketch kindly 
sent me by Mr. Grunow, who supposes, with some doubts, that 
it may be the Ceratoneis laminaris Ehrb. It has been distrib- 
uted in Cl. & Möll. Diat. No 153 (Corsica). I have found 
the same species in gatherings from the Adriatic Sea. 
M. undulata Grun. (Verh. 1860, pag. 576, P1. I, fig. 5. T. 
MS: 1811, par sk T(0) Ed CNOV, CIS): 
M. rhombica Cl. N. Sp. — Rhombic. Med. line slightly undu- 
late, without accompanying lines. Strie coarse 11 in 0,01 mm. 
slightly radiant, composed of distinct pearl-like puncta, which 
form wavy longitudinal rows. Loculi marginal, equal in size, 
about 6 in 0,01 mm. Surface of the valve not perfectly plane, 
being a little impressed on both sides of the median line. 
Length 0,o04s mm. Breadth 0,02 mm. — Pl. 35, fig. 9. 
M. lanceolata Thw. (Van Heurck Syn. P1. IV, fig. 15—17). 
Length of the valve 0,043 mm. Breadth 0;j015 mm. Strie 16— 
19 in 0,01 mm. Loculi 6 in 0,01 mm. 
M. apiculata W. Sm. (Syn. II, pag. 65, P1. LX, fig. 387). 
M. minuta Grev. — var. with 16 strige and 8 loculi in 0,01 
mm. Length 0,03—0,04 mm. Breadth 0,014 mm. — According 
to Grunow (T. M. S. 1877, pag. 176) M. minuta has closer 
strige, 25 in 0,01 mm. 
M. Jelineckii Grun. (T. M. 8: 1877, pag. 174, P1. OXCV, 
fig. 1) var. Length 0,06 mm. Breadth 0,015 mm. Strie 18 in 
0,01 mm. Loculi 5 in 0,01 mm. 
M. quinque-costata Grun. (Verh. 1860, pag. 578, P1. VII, fig. 
8) Several varieties. On a small specimen, 0,03 mm. in length 
and 0,018 mm. in breadth, I counted 26 strie and 4 loculi in 
