r^ - — - - - — - -I I ■ C? 



MAK:N DIATOMS OF THE ALBATIiOSS VOYAGES. 323 



tliis and 7?. rohustum Grun., but luive not Rucceedod, So fur as the valval view is 

 concerned, neither llu^ median line, the arrangem(^nt and pnnctation of the striae, 

 the outline, the size, the character of the border, or the shape of the apical liyaline 

 areas give any constant marks of di.^tinction. So far as I am aware, rohustum never 

 displays the strikin^r doulde-lobed \'alves commonly met with in japonicuvi; but 

 unfortunately this featuro is not at all constant in tlie latter, and in fac^t the original 

 type is not of that shape, ^^ Tlie oidy ai)preciabhi difference is to be found in the 

 zonal view. Tho stria<i injaponicuni \xi\'. generally small and narrow, formitig a closely 

 s(^t row for each compartment of tli<^ series, madt^ up of coarse but obscure blotches, 

 giving a semimoniliform appearance to the striae; or if the striae be broad and the 

 l>[otches approach squares, they are also coars(^ly dott<HL Rohustum has generally 

 large square markings, set loosely in the rows of each compartment, and marked with 

 fine puncta, I am convinced that tliese two species arewilli difficulty to be kept 

 s(^parate; and that a study of tlie abundant figures iu Schmidt ^ will prove this. I 

 have named my specimens solely on the basis of the zonal markings, and many 

 valves unquestionably l)elonging to a single specios, but not affording a zonal view, 

 could with equal accuracy l>e given Grunow's specilit* namo. 



Th(^ variety called by Pantocsek R. mikado occurs at fetation 3G88II. 



Found at stations 2844, 2848, 3604, 3(18811, 3784, Bering and Okhotsk seas. 



ENTOPYLA Ehrenb. 



Enlopyla Ehrenb, Her. Akad. Wiss. lierL 1848: fi. 1849. Grun. Verb. Zool. Dot 

 Ges. Wien 12: 428. 1862. Schmidt, Atlas pi 2SL 1902. De Toni, Syll. Alg. 2 

 773. 1892. Tritch. Hist. Infus. rd. 4. 810. ISGl . Ral>h. Fl. Eur. Alg. 1: 308. 18G4. 



Euplmria Arn. Quart. Journ. Micr. Sci. 6: 89. 1858. Triti'h. Hist. Infus. ed. 4. 809. 

 18G1. 



Margaritoxicon iixu. Abli. Schl. Ges. 1862': G. 1862, as synonym. 



Gephyria Arn. in i)art; Quart. Journ. Micr. Sci. 8; 20. 1860. rritcb. Hist. Infus. 



ed, 4. 809. pL 4./- 50. 18G1. 

 AcJinanthcs Bory, in part; Jtjlmst. Quarf. Journ. "Micr. Sci. 8: 15. pi. l,f. 14, ISGO. 

 Surirclla Turp. in part; Ehrenl). Tliy^^. Abh. Akad. Wiss. Berl. 1841: 388, pi. 1. L 



f. 06. 1843. 



The distinctive marks separating Ihi.s »^onu.s fnuu (Sepliyria Arn. are sumniari/ed 



by Schmidt, c aw follows: (1) The costae on the valves of I'hitopyla alternate on cither 

 side the median line; in Gephyria th<*y are transversely continuous. (2) The inter- 

 nal septa in Entopyla have their poroy in a longitudinal straight row along either 

 side and therefore show as straight rows of dots through the costae; in Gephyria 

 these pores are iu two zigzag Icuigiiudinal series. (3) These pores arc in Entopyla 

 close to the margin on either side; in Gephyria ini<Uvay bt^tween tin* margin and 

 the median line. Although the foregoing characteristics are well marked and seem 

 to be constant, they constitute at i>est a scanty basis for generic (Ustin<'tion Ix^tween 

 forms otherwise so miu'h alike. 



Entopyla australis EhronI). H(^r. Akad, Wiss. Tx^rL 1848: G. 1849. rrilrh. Hist, 

 lulus, ed. 4. 810, bSGI. Jan. Abh. Sclilos. Ges. Valerl. (^ili. 1862-: (i, 2?, 32. pi 

 IB./. S, 14, Ki-JO. lsf>2. De Toni, Sylb Alg. 2: 773. 1892. Schmidt, Atlas pi 



230. f. 1-16. J!)02. 



Surirellaaif strain l':hrenl). Phys. Abli. Akad. AVi(Mi 1841: 38S. pi /. I.f. l)b. 1843. 



Pritch. IIi?t. Tn.fus. ed. 4. 798. lS(iL 

 Eiipleuria incurvafa Arnolt, Quart. Journ. Micr. Sci. 6: 90. 1858. 



a Cf. Schmidt, Atlas pi 219. f. 13. with pi 220. J. /. 1899. 

 i>Ol). cit. pi, 217-221. 

 ^Op, cit. pi 231, 1902. 



