510 Mr. C. Mereschkowsky on Californian Diatoms. 
160. Licmophora lata, Mer. (PI. V. figs. 1-3.) San Pedro, 
Redondo Beach, very common ; Monterey, common. [M.] 
Valve broad, bottle-shaped, upper part somewhat linear or 
slightly attenuated to the summit, abruptly attenuated towards 
the lower third or fourth, becoming conical ; lower apex some- 
what narrow, rounded, upper broadly rounded. Pseudoraphe 
rather broad, very distinct, striae very fine. Girdle-face 
moderately broad, cuneate, upper angles subrounded, upper 
margin convex; septa very deep, 0°012 mm. in average, 
arcuate ; septal puncta distinct, round. Endochrome granular, 
Forming numerous colonies on long stypes composed of two 
layers, an external and a thinner but denser inner one; mode 
of ramification the same as in L. dalmatica, L. gracilis, and 
L. paradoxa, Length 0:055-0:077 mm., breadth of the 
girdle-face 0°028-0'041 mm., breadth of the valve 0-014- 
0-020 mm. 
This species is nearly allied to L. paradowa, from which it 
differs by the much broader valves of a somewhat different 
shape; the granules of the endochrome are rounded, while in 
L. paradowxa they are usually elongated, bacilliform, and the 
colonies are symmetrical, while in L. paradoxa one side of 
the colony is always more developed than the other. 
161. Licmophora Monksii, Mer. (Pl. V. figs. 8, 9.) San 
Pedro, common; Redondo Beach, not rare. [M.] 
Valve broad in the middle, slightly attenuated towards the 
superior apex, which is truncate, sometimes broadly rounded, 
more considerably attenuated towards the lower end, which is 
narrow ; lower part forming an elongated cone with usually 
straight margins. Strie fine, except at the lower end, where 
they are distinct under an ordinary magnifying-power, about 
12-13 in 0°01 mm. Girdle-face (fig. 9) cup-shaped, with 
more or less convex margins, upper angles rounded. Septa 
very deep (average 0:°007 mm.), very fine, almost straight 
and parallel, somewhat divergent above the septal puncta, the 
latter small, round, very distinct ; secondary puncta large, 
adjoining the septa. Hndochrome granular. Forming small 
colonies on short structureless stypes. Length 0:017-0-043 
mm. (usually 0°025-0°035 mm.), breadth of the girdle-face 
0-012-0°021 mm., breadth of the valve 0:007-0:008 mm, 
‘The cup-shaped girdle-face of this species is a very peculiar 
character, not to be found in any other species. The secondary 
septal puncta (a, a in fig. 9), which usually are situated in- 
wards of the septa, are here so close to the latter that, if not 
carefully examined, they can easily be mistaken for the septal 
