X 



A FOSSIL MARINE DIATOMACEOU8 DEPOSIT. 323 



JN.prcetexta, Ehr. (Greg., " D. C," p. 9, PI. 9, Fig. 11).— 

 Small and scarce. Some specimens closely resemble N. Californica, 

 Grev. (" Ed. New Phil. Jour.," Vol x, p. 29, PI. 4, Fig. 5). 



N. sparsipunctata, Gr. & St., n. sp. — Valve broad, oval ; ends 

 subacute. A line of closely- set puncta on each side of the raphe, 

 leaving a narrow clear space, slightly enlarged around the central 

 nodule. Margin furnished with a line of oblong puncta, within 

 which is a narrow clear band. The rest of the surface dotted over 

 with puncta, forming sparse, irregular, radiating lines. Not very 

 scarce. Length, -006"; breadth, -004". (PI. XVIII, Fig. 1.) 



N. interlineata, Gr. & St., n. sp. — Valve broad, oval ; ends sub- 

 acute and slightly produced ; surface covered with dotted, sub- 

 radiant stria?, about 17 in •001", interrupted by a narrow clear space 

 on each side at about one-third of the distance between the central 

 line and the margin, extending 'symmetrically with the margin 

 nearly to the ends of the valve. Scarce. Length, -005" ; breadth, 

 •003«. (PI. XVIII, Fig. 2.) 



N. (Alloioneis ?) Grundlerii, Cleve & Grun. (CI., " Diat. of 

 W. I. Archipelago," p. 7, PI. 11, Fig. 10).— Length, -004"; 

 breadth, '0017". Stria? radiant, dotted, 30 in *001". The median 

 line not so eccentric as in Cleve's figure, and the stria? more radiant, 

 but in all other respects agreeing closely. One specimen observed. 



Entopyle^e. 



Gephyria incvrvata Arnott (" Pritch.," p. 809, PI. 4, Fig. 50). 



— Scarce. 



Fragilarie^e. 



Glyphodesmis marginata, Gr. and St., n. sp. — Valve lanceolate 



with rounded ends, and distinct centre and end projections. There 



is a clear longitudinal central space, and the margin is bordered 



with two rows of small cellules. Length, -0026" ; breadth, 



•00057". (PL XVIII, Fig. 3.) 



Synedre^e. 



Synedra crystallina (Ag.), Kiitz ("S. B. D. } " p. 74, PI. 12, Fig. 



101). — Scarce. 



Eutilariej^. 



Eutilaria radiata, Gr. and St., n. sp. — Valve with parallel sides 



for a short distance at centre, then tapering more or less rapidly to 



the subacute ends. Centre and ends clear, remainder of valve 



covered with sparse radiating lines composed of dots, about 35 in 



•00 1". Central process large, spiral. Marginal seta?. Length 



