MAKINE DIATOMS OF THE PHILIPPINE ISLANDS 19 



AMPHORA ARENARIA Donkin 



(Peragallo, Diat., France, pi. 48, figs. 11-14.) 



AMPHORA BICONVEXA Janisch 



(Schmidt, Atlas, pi. 25, fig. 68.) 



Although Cleve in his Naviculoid Diatoms (vol. 2, p. 137) and 

 some other diatomists admit this to specific rank, it is too close to 

 Amphora bigibba Grunow. 



AMPHORA CAMELUS Cleve and Grove 



(Le Diat., vol. 1, p. 158, pi. 22, figs. 9-12.) 



Curiously, I have selected the name A. dromas for this diatom 

 before finding the above illustration — a more descriptive name, as 

 this species has two humps. Measurements of my specimen were, 

 length 0.095; width 0.028; lines 6 in 0.01 mm. 



AMPHORA CLARA A. Schmidt 



(Schmidt, Atlas, pi. 25, fig. 20.) 



The type was found in material from the nearby waters of Yoko- 

 hama. 



AMPHORA CLATHRATA, new species 



Plate 3, fig. 5 



Dorsal side of valve slightly convex for most of its length, then 

 rapidly curving toward the blunt rounded ends; ventral side nearly 

 straight, but indented at the center; rhaphe adjacent to and parallel 

 with the ventral side; central nodule obscure; no hyaline area; ter- 

 minal nodules on lower side of the rounded ends elongated and 

 reflexed; markings heavy, closely set, transverse costae extending from 

 the ventral edge to within one-quarter that of the dorsal side, this 

 one-quarter marked with two rows of large oval beads, fewer than 

 the costae. 



Length 0.165; width (median) 0.031; costae 5 in 0.01 mm.; dorsal 

 beads 3.2 in 0.01 mm. 



This diatom is related to A. egregia Ehrenberg, especially as fig- 

 ured in Diatoms of France, plate 46, figure 12, and resembles somewhat 

 A. praevalida Janisch (Janisch, Gaz. Exp., pi. 20, fig. 21). 



Type.— Cat. No. 43570, U.S.N.M. 



AMPHORA COMPACTA, new species 



Plate 3, fig. 6 



Dorsal side of valve flat for three-quarters of its length or barely re- 

 flexed at the middle, curved to the very blunt ends; ventral side 

 slightly biconvex, indented at the middle, the ends having small 

 hyaline "ear lobes" below the ventral edge; rhaphe slightly double- 



