MANN DIATOMS OF THE LLBATROSS VOYAGES. 259 



reported where it has been found are in Russia i. e. Simbrisk, Ananino, and Arch- 

 angelskrkurojedowo . il would be interesting to know the geological outcrop thai 

 furnished t bis»specimen. 



Found al station 3361H, Bering Sea. 



Coscinodiscus subtilis Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 111', pi 1. ///. 

 f.is.pl..,. VII. f. 4. 1843; Mikrog. pi 18. f. 35, pi 33. XIII / , pi S3. XVI 

 ;./-/..;;. VII. f. 6, pi 35. XXII. / », pi , >. XXIII i >. 1854. Ehrenb. Phys. 

 Abh. Akad. Wiss. Berl. 1841: 138. pi. I. III./. 18. L843. G t.Journ. 



Micr. Sci. 7: 81. L859. Pritch. Hist. Infus. ed. 4. 830. 1861. Jan. Abh. Schl. 

 Ges. Vaterl. Cult. 1862 : t. pi lA.f. :. L862. Jan. Diat. Gaz. Exped. pi. 

 Schmidt, Atlas pi 57. f. n 16. L878. II. I.. Smith, Sp. Diat. Typ. no. LOO. 

 Kan. Proc. Roy. Soc. Edinb. 16: 494. L889. De Toni, Syll. Alg. 2: 

 L894 exclude Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 443. pi 3. VII. 

 L843. (.run. Denkschr. Akad. Wien 48-': 81. pi 3. ./". ?6. L884. Ehrenb. 

 Mikrog. pi 12. f. ;. L854 . 



Rattray has included hereseveral references which arc very questionable. The two 

 varieties described by him& are very unsatisfactory and uncertain examples of this 

 species. Its boundaries are unquestionably misty. It approaches I nanni 



Greg., C. odontopkorus Grun., C. rothii Grun., C. symmetricus Grev., ( . fasciculatus 

 Schmidt, C. denarius Schmidt. II. L. Smith's type no. LOO is truly typical. Com- 

 pare synonymy of C. ruyrmanni Gr< 



Found at Btations 2844, 3526, 3604H, 3607, 3635H, Aleutian Maud- and Bering 



Coscinodiscus undulosus Mann. sp. now I'i \ti XI. IX. in.i re I. 



Frustules small and very delicate; valves Blightly and evenly convex; mark; 

 oval beads elongated in the radial line, all of one size very small, arranged in radiat- 

 ing rows, but s<» spaced in the rows as to produce a uniform delicate wavy appearance 

 over the entire valve; border moderately broad, perfectly smooth. A fragile and 

 handsome species, found only in the following dredging, there quite abundant. 



Diameter of valve, 0.125 to 0.136 mm. 



Type in the U. S. National Museum. No. 590121, from station 3526, Bering - 

 August 5, L893; 19 fathoms, bottom of fine sand and dark mud. 



Coscinodiscus verecundus Mann. sp. nov. Plate I., pigi re I. 



Valve nearly flat; central area very minute or wanting, marking of minute beads, 

 the largest at the center and regularly d< creasing to the border; arranged in indistincl 

 fascicles, L2to 11 in Dumber, irregular in width, showing the watch-milling effect of an 

 Actinocyclus; border of two distinct portions equal in width, namely, each about one- 

 twentieth the ra<lius; the inner portion a smooth hand ornamented with even] 

 large but dim beads in a single circle; the outer portion strongly marked with trans- 

 verse radial i Btriae, slightly wider on the outer Bide. The entire valve most delicate 

 and pellucid. 



Diameter of valve, 0.078 mm. 



Type in the U. S. National MEuseum, No. 590122 from station 3688H, Okhotsk 

 Sea. August 27, L896; L,562 fathoms, bottom of brown mud and tine -and. 



a Jan. Diat. Gaz. Exped. pi named C. lentig a. . pi 5./. 7, 



/.!..',. pl.20.f.5. Schmidt, Atlas pi. 6 do name), pi • do name). 



L878. VanHeur. Synop. 218. pi. 131. f. 1. 1881 L8S i Ehrenb.? in text 



and ('. rwnnannicus Greg, in plate . 



''Proc. Roy. Soc. Edinb. 16: 1!)7. { >l. l.f. 16, />/. S.f. 6. . - 



