MARINE DIATOMS OF THE PHILIPPINE ISLANDS 159 



they totally disappear before they reach the middle of the valve; this 

 latter indefinite in contour, because not bounded by any investing; 

 line, hyaline, except for a few scattered watery dashes; polar areas 

 evident. 



Length, 0.200; width, 0.153 mm. 



In general shape this resembles the one shown in Schmidt's Atlas, 

 plate 5, figure 8, which, however, as there stated, is a variety of S. 

 fastuosa Ehrenberg. This differs from that species in three respects: 

 it has no well-defined central area; the outer ends of the costae are 

 not wedge shaped with one to three teeth on the marginal side; tha 

 broad part of the costae is not marked with longitudinal but with: 

 transverse lines. Found only at Jolo Jolo Harbor; there frequent. 



Type— Cat. No. 43691, U.S.N.M. 



SURIRELLA TAHITIANA Castracane 



(Castracane, Chall. Exp., p. 61, pi. 19, fig. 3.) 



SYNDENDRIUM DIADEMA Ehrenberg 



See Cliaetoceros diadema (Ehrenberg) Gran. 

 Genus SYNEDRA Ehrenberg 



SYNEDRA CRYSTALLINA (Agardh) Kiitzing 



(Van Heurck, Synopsis, pi. 42, fig. 10; Peragallo, Diat., France, pi. 79, figs. 1-4.) 



The removal of this and a few other species into a new genus, 

 Ardissonia, on the basis of the division of the transverse rows of 

 beading by longitudinal lines, is not to be commended. 



SYNEDRA CUNEATA (Grunow) Peragallo 



(Peragallo, Diat. France, pi. 78, figs. 1-2.) 

 See Sceptroneis cuneata Grunow. 



SYNEDRA FULGENS W. Smith 



(Smith, Brit. Diat., pi. 12, fig. 103; Van Heurck, Synopsis, pi. 43, figs. 1-4; 

 Peragallo, Diat., France, pi. 79, figs. 5-6.) 



SYNEDRA PULCHERRIMA Hantzsch 



Plate 37, fig. 1 

 (Hantzsch, Diat., Ostind. Arch., p. 19, pi. 5, fig. 2.) 



This apparently rare species is not uncommon in the Philippine 

 Islands. The type was found in the near-by East India Archipelago, 

 described in 1863 and never recorded since. My specimens are all 

 larger than that of the type as given by Hantzsch, but only slightly 

 wider, namely— length, 0.615; width, 0.031 ; width of ends, 0.038; 8.5 

 to 9 lines in 0.01 mm., the type being length 0.24 to 0.36, width 0.017 

 to 0.029 mm. 



35035—25 11 



