18 P. T. CLEVE, ON SOME NEW DIATOMS. 
The C. Ecclesianus Grev. (1857) is as Mr. Janisca correctly states the same as 
C. fenestratus Grev., which is the entire frustule. Mr. Janiscu proposed (1863) the 
name C. Rabenhorstianus, but which should be changed for the older name of GRE- 
vitte’s. The type of this extremely variable species, especially abundant in the ca- 
ribbean area, has alternating longer and shorter coste and an area not surrounded by 
a circlet of puncta. The form from Gallapagos Islands is therefore distinct, but, con- 
sidering the great variability of the species, I am inclined to regard it only as a 
variety. 
The stellate markings on the disc are very variable, and in some specimens 
wanting. 
2. Campylodiscus Margaritarum Cu. N. Sp. 
Coste numerous, covering about */, of the disc, interrupted by a fine line and 
surrounding an elongate area, where some fragmentary punctate lines are visible as the 
continuation of the coste. 
Diam. 0,06 mm. 
Pl. LY, fig. 62, °°"). 
Pearl Islands rare (Eugenie Exp.). 
In its general form this species resembles C. angularis Grev., but is different. 
Plagiogramma, Grev. 
1. Plagiogramma rutilarioides Cu. N. Sp. 
Small, rhombic, more or less elongate, with two converging coste around the 
centre, but not near the ends. Structure: transverse punctate lines, 15 in 0,01 mm. 
Margin with one or two sets of larger puncta, which probably are the bases of bristles. 
Length 0,03—0,0425 mm. Breadth 0,01—0,013 mm. 
Pl. TY, fig. 64, 7". 
Port Jackson, Australia (Eugenie Exp.). 
2. Plagiogramma spinosum Cr. N. Sp. 
Valve narrow, constricted in the middle, then dilated, and again constricted. 
Coste 2 strong, around the centre. Ends slightly capitate. Structure: puncta, arran- 
ged in regular transverse rows, 10 in 0,01 mm. and in irregular longitudinal lines. 
The margin of the frustule is furnished with a row of short sete or bristles. The 
ends of the valves have blank (not punctate), oval areas. 
Length 0,08 mm. Breadth 0,01 mm. 
Pie 1M ee By ye 
The marginal sete are visible when the frustule lies in an oblique position. 
Gallapagos Islands rare (Eugenie Exp.). 
This form has the same general outline as P. caribbeum Cx., P. lyratum Grev 
and P. Barbadense Grev. It is most nearly akin to the latter, but the ends are dissi- 
milar and the structure different. 
