MARINE DTATOMS OF THE PHILIPPINE ISLANDS 33 



AULISCUS QUADRATUS. new species 



Plate 7, figs. 1-2 



Valve slightly oval, its long axis about 45° right and left from the 

 two ocelli; these large, sessile, with elevated and rugose centers; the 

 entire valve, except a small hyaline circular central area, covered 

 with a network of anastomosing lines, but in a large square occupying 

 the middle of the valve these lines are either obscure or sometimes 

 absent, so that this square is sharply defined from the rest of the 

 valve. 



Diameter, 0.101-0.107 mm. 



Type— Cat. No. 43586, U.S.N.M. 



AULISCUS RETICULATUS Greville 



(Micro. Journ., 1863, pi. 2, fig. 4; Schmidt, Atlas, pi. 30, figs. 1-3.) 



AULISCUS SCHMIDTH Grundler 



(Schmidt, Atlas, pi. 30, fig. 7.) 



AULISCUS STOCKHARDTII Janiseh 



(Janisch, Guanos., pi. 1, fig. 4; Schmidt, Atlas, pi. 30, figs. 11-13; pi. 67, fig. 6.) 



This species occurs in a large number of fossil deposits that are 

 widely separated, New Zealand, California, Hungary, Bolivia, etc., but 

 is rare as a living form. It may be looked upon as a hold over. 



Genus AURICULA Castracane 



AURICULA INSECTA Grunow 



(Schmidt, Atlas, pi. 40, figs. 2-3.) 



AURICULA JAPONICA Brun 



(Brun, Diat. Jap., pi. 4, fig. 8.) 



AURICULA OSTREA Brun 



(Brun, Diat. Jap., pi. 4, fig. 7.) 



Genus BIDDULPHIA Gray 



BIDDULPHIA ABJECTA, new species 



Plate 7, figs. 3-4. 



Valve triangular, with slightly concave sides; apices ending in blunt 

 subsessil rings; a few scattered beads, closely but irregularly set, 

 form a curved line crossing each of the angles; the middle part of the 

 valve quite hyaline, except for a few coarse blotches along the sides; 

 these curve downward to form the deep triangular half box which, 

 united with the corresponding other half by the girdle, makes the 



