\I\.\.\ DIATOMS OF THE ALBATROSS VOYAGES. 265 



Craspedodiscus coscinodiscus Ehrenb. Ber. V.kad. Wise. Berl. 1844:266. 1845 

 Mikrog. pi. 18. f. 108, pi. S3 XV f ?,pl ZV1 f 5 L854. Pritch. Hist [nfus. 



ed. L832. pi. 5.f. 80. 1861 O'Meara, Proc. Roy. Irish ^cad. II. 2: 266. pi i 

 26.1874. Schmidt, Atlas pi. 66. f ■ • L881; pi. 184. f. A L893. Bright. Quart. 

 Journ. Micr. Sci. 8: 95, L39. pi. 5. f. I860, correction. Gran, in Fenzl, R 

 Novara Bot. 1:26, I'M. L870. Ratt. Proc. Roy. Soc. Edinb. 16:600. L889 De 

 T.mi.Svll. Alg. 2: L199. L894. Wolle, Diat. X. A. pi 86. f. 3. 8. L890. 



Pyxidicula coscinodiscus Ehrenb. Ber. Akad. Wiss. Berl. 1844: 85. l v i"» 



Craspedodiscus microdiscus Ehrenb. Mikrog. pi S3. XVII. f. >. 1854. 



Craspedodiscus pyxidicula Bright. Quart. Journ. Micr. Sci. 8: 95 pi ■ i I860. 

 Moeb. Diat.-taf. pi 28. f. ». L890. 



Coscinodiscus pyxidicula Kutz. Sp. Alg. L26. L849. Griff. & Eenf. Micr. Diet. ed. :;. 

 pi. 43. f. «. L875. 

 Found at .-tan (Hi 2919, off southern California. 



CYCLOTELLA Breb. 



Cyclotellaa Breb. in Breb. & God. Consid. Dial 20. L838. Kutz. Bacill. ■"><». 1844. 

 Arnott, Quart. Journ. Micr. Sci. 8: l'H. L860. Van Eeur. Synop. 213. Pritch. 

 Hist. [nfus. ed.4. 811. L861. Castr. Rep. Voy. Chall. Bot. 2: 1 \0. L886. DeToni, 

 Syll. Alg. 2: L351. L894. 

 Cymbella C. Ag. Consp. Diat. 11. L830, in pari. 

 Pyxidicula Ehrenb. [nfus. pi 10. f. i. [838, in pari. 

 Discoplea Ehrenb. Ber. Akad. Wiss. Berl. 1847: 184. L848; Mikrog. pi 6. II. f 



pi 39. lit. .">. [854. 

 In many instances single vah es of this genus are identical in general build with those 

 of Melosira C. Ag. They never, however, grow in connected chain- or filaments, as do 

 those of the latter genus. Their sculpturing is also usually sui generis. The genus is 

 universally recognized as distinct, a decided advantage in classification, in view of the 

 size of Melosira. Although Cyclotella represents much smaller form- than those com- 

 prising the genus Coscinodiscus, the general shape ami the mode of growth of the two 

 an- closely similar, and certain members of each genus are difficult to distinguish. 



Cyclotella regina Mann. sp. nov. Plate I., pigi re _' 



Valve circular; consisting of a large central area, three-fourths the diameter of the 

 valve and a rim one-fourth the diameter; the former nearly hyaline, hut having a few 

 scattered beads near the slightly elevated center ami a narrow fringe of tine radiating 

 lines next to the rim; rim nearly flat, showing differenl markings on its under and 

 upper sides; the under (section a in the figure) ornamented with delicate ami close 

 transverse striae; the upper section h in the figure finely beaded on ilm inner half. 

 the outer half hyaline; a tine bu1 evident line near to and parallel with the margin. 



Diameter of valve 0.088 mm. 



The general appearance of this species i.- somewhat like < '. transylvanica Pant.'' 

 Specimen- are scarce at -tat ion 2807, at the Galapagos Islands, and only a single valv • 

 was found at .-tat ion 2823 ju-t inside the mouth of the Gulf of < 'alifornia, opposite the 

 town of I. a Pax. 



Type in the 1". s. National Museum, No. 590123, from station 2807; also from -ta- 

 tion 2823, Galapagos [-land- and Gulf of California. 



Cyclotella striata (Kutz.) Grun. in Cleve A: Grun. Sv. Vet. Akad. Eandl. 17-: IP.) 

 [880. Van Hem-. Synop. 213. pi 9S./.6 10, It 15. [881. Schmidt, Atlas pi. 

 ttS.f. 9 14. 1896. De Toni, Syll. Alg. 2: [352. [894. 

 Coscinodiscus striatus Kutz. Bacill. [31. pi. i. f. 8. [844. 



As a subgenus by Kutzing, l.innaea 8: 535. 1833. 

 & Schmidt, Atlasy^/. MS./. :! H. IS 



