.MANN DIATOMS OF THE ALBATROSS 70YA< 287 



The interesting form constituting Mi«' genus Peragallia Schutt, does, as its author 



luni of transition between the presenl genus and Rhizosolenia Ehrenb., as its 



valves are true Chaetoceros type, while ili«- zonal pari shows the plicate bands of 



Rhizosolenia. Bui this latter portion, the zone, i> liable to >\\<>\\ various chanf 



ma n y genera* and is hardly of enough importance to -• parate this ol hen* i-<- normal 



< lhaetoceros from the genus. 6 



The following genera I have qoI included in the above. Some of them are plainly 

 distinct from it, as Skeletonema Grev. not Grun. and Strangulonema Gn Others, 

 like Syringidium and Pterotheca, though showing considerable resemblance to 1 1 1 « - 

 interna] cases of Chaetoceros I too imperfectly understood to warrant any 



aafe conclusion. See Syringidium Ehrenb., c Omphalotheca Ehrenb. ,<* Pyxilla 

 ( iii\ ..' Pterotheca Grun.,) Stephanogonia Ehrenb., o Skeletonema Grev.,* Strangulo- 

 nema Grev., « Xanthiopyxis Ehrenb.,; and ' "orel hron Castr .* 



Chaetoceros coarctatus Laud. Trans. Micr. Soc. Lond. n. s. 12: 79.pl. 8.J.6. L864. 

 Cleve, Bih. Sv. Vet. Akad. Eandl. 1 : 9. pi 2. ./'. 10. L873. De Toni, Syll. Alg. 

 2: 996. L894. 

 This is variously spelled coarctatus by De Toni, coarctata by Lauder, coarctatum by 



< Jleve. The first is correcl . 



Found al Btation 1029H, Bering Sea. 



Chaetoceros didymus Ehrenb. Ber. Akad. Wiss. Berl. 1845:7"). L846; Mikrog. pi. 

 .;:,.[. XVII. f. 5, pi. 18. f r . L854. Bright. Quart. Journ. Micr.Sci.4: 107. pZ. 7. 

 /".., ;. 1856. Jan. Abh. Schlee Ges. Vaterl. Cult. 1862: pi. lA.f. 21,30,32. L862. 

 Pritch. Bist. [nfus. ed. 1. 862. 1861. Griff. & Benf. Micr. Diet. ed. 3. j>!. .;/. 

 /. .:. I-::.. 

 My specimen is a somewhat <li>ul>n'ul example of ih<' above, the Betae being 

 abnormal. 



Found at Btation 1029H, Bering Sea. 



Chaetoceros furcatus Shadl>. Mann. 

 Bacteriastrum furcatum Shadb. Trans. Micr. Soc. Lond. n. -.2: 14. j>J. l.f. 1. L854. 



Moeb. Diat.-taf. pl.S. f. /. 1890. Pritch. Hist. Infus. ed. l. 863. pi. S.f. 26. 1861. 

 Bacteriastrum curvatum Shadb. Trans. Micr. Soc. Lond. n. s. 2: Id. pi. l.f. 2. 1854. 



Moeb. Diat.-taf. pi. S.f. 2. 1890. Griff. & Eenf. Micr. Diet. ed. :;. pi. \3.f. is. 



1875. 

 Actiniscus sexfurcatus Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1854: 237. L855; 



Mikrog. pi S5B, IV. f. 15. 1854. 

 Bacteriastrum varians I. and. Trans. Micr. Soc. Lond. n. b. 12: s. pi S.f. ' 6. 1864. 



II. I.. Smith, Sp. Diat. Typ. no. 57. 1874; Jour. Quek. Micr. Club II. 3: 12. 

 ./'. 2. 1887. Van ll.in. Synop. pi 80. f. ■■ 5. 1881. Moeb. Diat.-taf. j>l. 



189(). Castr. Rep. Voy. Chall. Bot. 2: 82, 84. pi /;./. :. pi 19. f. ... pi 2S.'f. l. 



1886. 



"('). Palmer & Kelley, Proc. Acad. Phila. 1900: 165 179. !!»<»». 



M'i. Van Beurck, Treat. Dial. 419./. 137. 



i Ber. Akad. Wiss. Berl. 1845: 357, 365. 1846; Mikrog. />/. S5A, IX. f. 11. 1854. 



<i Ehrenb. Mikrog. 126. pl.35A, IX. f ,. 1854. 



eTrans. Micr. Soc. Lond. n. b. 13: 1. pi l.f. 5. 1865. 



'Van Beur. Synop. pi 83 bis.f 10 11. 1881. 



r. Akad,. Wiss. Berl. 1844: 264, 271. L845. 

 ftTrans. Micr. Soc. Lond. n. s. 13: 43. pi 5.f. 1. L865. 

 'Trans. Micr. Soc. Lond. n. b. 13: 13. pi S.f. 2. l^ 1 



Ber. Akad. Wiss. Berl. 1844: 264, 273. 1845; Mikr. _ A 17/./. 17. 



k Castr. Rep. Voy. Chall. Bot. 2: 85. pi tl 



