306 DEEP-SEA DIATOMACEiE MANN. 



should be droj^ped as a specific characteristic. The genus ought to be 

 iiK luded under Surirella. 



Cymatosira Laiirenziana Grun. (Van Hcnrck's Syn., pi. 45, fifj. 42.) Frequent. 

 This genus shouUl bo. as siig^yosled by Trof. II. L. Smith, united 

 under i^m<7t7rtr/rt, from Avliich it ditters in no iniportiint respect. Lyng- 

 byo constituted the genus Fragilaria in 1819; Grunow that of Cywa- 

 tosira in 1802. 



Cymbella cistula Honipr. (Van Houick's Syn., i>l. 2, iig.s. 12, 13.) Scarce. 

 Cymbella cuspidata Kj^. (Van Honrck's Syn., pi. 2, fig. 3.) Scarce. 

 Cymbella parva W. S. (Van Heurck's Syu., pi. 2, fig. 14. Schmidt's Atlas, pi. 10, 

 fig. 15.) Frequent. 



This is, however, liardly W. kSmith's C. 2)f(i'i'(( (" Gocconema parvum'''')^ 

 as is seen by his figure, pi. 23, fig. 222, and p. 76. It should either 

 receive a new S])ecifi(' name, or be classed as a small form of G. cymhi- 

 formis E, from which it difters very slightly. 



Deuticula elegans Kg. (Van Heurck's Syn., pi. 49, figs. 14, 16.) Scarce. 

 Ditylum (=Triceratium) Brightwellii West. (Van Heurck's Syn., pi. 114, figs 3-9.) 

 Conunou. 



This diatom is evidently a distinct genus, and should be restored 

 with its old name, as suggested by Prof. IT. L. Smith. The unscien. 

 tific genus '■'■ Triccratium'''' is quite overcrowded with dissimilar forms 

 without this. 

 Encyonenia prostratum Kalfs. (Van ITonrck's Syn., pi. 3, Jigs 0-11.) Frequent. 



As the growth of diatoms in gelatinous tubes or otherwise is no 

 longer considered ground to constitute a genus, this form should be 

 classed under C'l/mbcUa, from which it differs iu no other respect. 



Epithemia turgida Kg. (Van He.urck's Syn., pi. 31, figs 1, 2.) Frequent. 

 Epithemia "Westermani Kg. (Van Heurck's Syn., pi. 31, fig. 8. Kutzing's Bac, 

 pi. 5, fig. 12.) Frequent. 



This is nothing more than a dose variety of E. tiir(ii(l<( Kg., and 

 should not be made a separate species. William SniitlTs figure of 

 '' A\ Wcstcrnumii Kg.'' is certainly incorrect. See Smith's J>. 1)., pi. 1, 

 fig 11. 



Epithemia zebra Kg. (Van Heurck's Syn., pi. 31, figs. 9-14. ) Scarce. 

 Eiinotia pectinalis Kaheuh. (Van Heurck's Syn., pi. .33, iigs. 15-19.) Frequent. 

 Euodia (=Hemidiscus. cuneiformis Wall. (Wall, T. M. S., 1860, pi. 2, figs. 3 4, 

 p. 42. Pritchurd's Inf., pi. (5, tig. 14.) Very common. 



This is probal)ly the E. f/ibba of Bailey. Comi)are with above Pritch- 

 ard'.s Inf., pi. 8, liy-. l>l», ]>, 852. It is virtually idcntieal witli IJ. in- 

 ornata of Ca.stricane. Sec ('liallnif/er Exp., pi. 12, Hg. 1, j). 111). The 

 older name Euodia (1851)) should take the place of Hemidiscus (1860). 



Eupodiscus radiatus Hail. (Van Heurck's Syn., pi. 118, figs. 1, 2. Moebins's 

 I'lates, 1)1. 2S. fig. 10. Smith's I?. D., pi. 30, fig. 255.) Scarce. 



This diatom is identic;!) with Coscinodiscns radiatus 10., excei)t for 

 the ocelli of the former; and as frustnles that normally have processes 

 are often destitute of the same, these two forms are suspiciously alike. 

 Eupodiscus tesselatus Roper. (Van llcureivs Syn., jil. US, figs. 6-7.) Very scarce. 



