MARINE DIATOMS OF THE PHILIPPINE ISLANDS 59 



Genus CISTULA Cleve 



(Cleve, Nav. Diat. ( vol. 1, p. 124.) 



CISTULA LORENZIANA (Grunow) Cleve 



(Wien. Verh., 1860, p. 547, pi. 1, fig. 3; Cleve, Nav. Diat., vol. 1, p. 124, pi. 

 1, fig- 31.) 



Although Cleve's suggestion to create a new genus for this unique 

 diatom does not seem to meet with general favor, I think it is justi- 

 fied. Its bisymmetrical valve with a rhaphe give it indeed a Navicula- 

 like appearance; but its rectangular form, its peculiar undulating 

 sculpture and the ends of the rhaphe set back from the extremities 

 of the valve mark it out from Navicula more sharply than do those 

 of such generally recognized genera as Tropidoneis, Scoliopleura, etc. 

 While standing with Van Heurck in seeing the subgeneric but not the 

 generic worth of most of the proposed new genera into which Cleve has 

 divided the huge genus, Navicula, I think this and Cymatoneis at least 

 are capable of such sharply cut distinction as deserve acceptance. 

 This is another species found at both Campeche Bay and the Philippine 

 Islands. 



Genus CLAVICULA Pantocsek 



CLAVICULA POLYMORPHA Grunow 



(Pantocsek, Hung. Diat., p. 37, pi. 2, fig. 12; pi. 9, fig. 75; pi. 26, fig. 234, etc.) 

 Genus CLIMACOSPHENIA Ehrenberg 



CLIMACOSPHENIA ELONGATA Bailey 



(Schmidt, Atlas, pi. 308, figs. 5-10.) 



Whether or not this is a variety of C. moniligera Ehrenberg is an 

 open question. 



CLIMACOSPHENIA MONILIGERA Ehrenberg 



(Ehrenberg, Amer., vol. 2, pi. 6, fig. 1; Schmidt, Atlas, pi. 307, figs. 1-9; 

 H. L. Smith. Types No. 631.) 



The scarcity of early diatom literature explains Shadbolt's giving 

 this the name C. catena (Micro. Journ., 1854, pi. 1, fig. 15). It occurs 

 also in Campeche Bay; but having a rather wide distribution, the 

 fact, taken by itself, has not much significance. 



CLIMACOSPHENIA SCIMITER, new species 



Plate 12, fig. 4 



Valve typically club-shaped, but increasing in width evenly from 

 base to apex; strongly curved sideways; its surface faintly marked 

 by transverse moniliform lines, evident at the margin but indistinct 

 toward the middle of the valve; the internal transverse septa delicate, 

 very narrow, and showing at the middle either obscurely or not at all 

 the break or sutural division common to specimens of this genus; about 



