MARINE DIATOMS OF THE PHILIPPINE ISLANDS 21 



AMPHORA CYMBIFERA Gregory 



(Gregory, Diat., Clyde, p. 526, pi. 14, fig. 97; Schmidt, Atlas, pi. 25, figs. 17-19.) 



Cleve in his Naviculoid Diatoms (vol. 2, p. 122) places this and 

 A. costata W. Smith (Smith, Brit. Diat., 1853, pi. 30, fig. 253) under 

 A. terroris Ehrenberg (as named in Abh. Berl. Akad., 1853, p. 526, 

 and figured in Ehrenberg, Mikrogeologie, 35A, pi. 23, fig. 2, also in 

 Lens, p. 83, pi. 3, fig. 20) and makes a correction in the text of 

 Ehrenberg's Mikrogeologie, giving figure 2 instead of figure 3 for A. 

 terroris and figure 3 for A. erebi Ehrenberg. De Toni, taking the 

 uncorrected figures in the foregoing, unites A. costata W. Smith with 

 figure 2, A. erebi, but keeps Ehrenberg's Mikrogeologie, plate 25A, 

 section 23, figure 3 separate, calling it A. terroris (Syl. Alg., pp. 287 

 and 418). The figure of Gregory and that of W. Smith do' not agree, 

 especially in the outline of the valve on its ventral side. It is best 

 to keep these forms separate, as similar but not identical, particularly 

 as H. L. Smith states that he and Professor Gregory have compared 

 notes on the structure of the Gregory specimen and the figure of 

 W. Smith's species and find them to be different. My specimens agree 

 accurately with Gregory's figure and description. 



AMPHORA DEDUCTA A.Schmidt 



(Schmidt, Atlas, pi. 25 fig. 13.) 



My specimen agrees exactly with the above, but it is doubtful if it 

 can be held separate from A. angusta Gregory (Schmidt's Atlas, pi. 

 25, fig. 14). 



AMPHORA DICHOTOMA, new species 



Plate 4, fig 1 



Dorsal side of valve strongly convex for three-quarters its length, 

 thence to the broad and blunt ends only slightly so; ventral side 

 strongly concave for three-quarters its length, with an arc parallel to 

 that of the ventral side, then curving upward to the ends; rhaphe 

 having its center nodule adjacent to the ventral edge, then curving 

 upward and ending in two strong terminal nodules at the ends and 

 close to the upper, dorsal side; a large hyaline area about the central 

 nodule; marking above the rhaphe of coarse but misty, radiating, and 

 curved costae, thicker on the dorsal side and tapering to fine dichot- 

 omous ends next to the rhaphe ; below the rhaphe (ventral side) the 

 costa are finer, indistinct, and curved away from the center. 



Length, 0.095; width, 0.028; lines, 6 in 0.01 mm., measured on the 

 median dorsal side. 



This species belongs to that group of this large genus the type of 

 which is A. spectabilis Gregory, especially as figured in Diatoms of 

 France, plate 48, figure 8. 



Type.— Cat. No. 43573, U.S.N.M. 



