MARINE DIATOMS OF THE PHILIPPINE ISLANDS 53 



CAMPYLODISCUS LIGULOSUS, new species 

 Plate 11, fig. 5 



Valve circular, strongly bent, its border consisting of an outer nar- 

 row band of a single row of small polygonal divisions rounded on 

 their inner side and forming an angle on their outer side, the apex of 

 each angle ending in a minute bead or bar reaching to the rim of the 

 valve; within this band is a single row of broad tonguelike and glassy 

 scallops of slightly unequal length and very irregular width, being 

 from two to five times as wide as the polygonal partitions of the 

 outer band, the largest scallops being at the two ends of the valve; 

 the central portion of the valve, two-thirds its diameter, is without 

 markings, except for a short central, rugose line, running toward but 

 not reaching the ends. 



Both diameters, 0.047 mm. 



Although there is considerable similarity between this and the 

 figure of C. dubius Leuduger-Fortmorel (Diat., Ceylan, pi. 4, fig. 47) 

 his description on page 46 clearly shows that the two are separate 

 species. 



Type.— Cat. No. 43603, U.S.N.M. 



CAMPYLODISCUS LIMBATUS Br6bisson 



(Brebisson, Diat., Cherb., pi. 12, fig. 1; Schmidt, Atlas, pi. 17, figs. 2-'C; Deby 

 Campy., pi. 10, fig. 62.) 



CAMPYLODISCUS MUELLERI A. Schmidt 



(Schmidt, Atlas, pi. 14, fig. 13; Deby, Campy., pi. 6, fig. 27.) 



This is another of the forms peculiar to both Campeche Bay and 

 the Philippine Islands. De Toni (Syl. Alg., p. 621) rightly notes its 

 suspicious resemblance to C. browneanus Greville. 



CAMPYLODISCUS ORNATUS Greville 



(Micro. Journ., 1863, pi. 1, fig. 3; Schmidt, Atlas, pi. 17, fig. 17; pi. 51, figs. 

 2, 3, 6; Deby, Campy., pi. 10, fig. 60.) 



According to Deby, Castracane's C. pTiilippinarum (Chall. Exp., 

 pi. 11, fig. 9) is identical with this. 



CAMPYLODISCUS PERSPICUUS, new species 



Plate 11, fig. 6 



Valve circular, strongly bent; border consisting of an outer narrow 

 row of rectangular beading, within which is a second row of longer, 

 smooth, tonguelike divisions, and within these a final row of narrow 

 but strong coastal ridges running radially halfway to the center, 

 about 36 in number, which is approximately one-third the number of 

 divisions of the second row; in this latter row the divisions are equal 

 in length, except those that are continuous with the coastal ridges of 



