MANN- DIATOMS OF THE ALBATROSS VOYAi 311 



Certainly so capable a delineator of the Diatomaceae as Tuffen Wesl would ool figure 

 Shad bolt's species so differently from Brightwell's, in the [natter of cellulation, if they 

 3pecifically near enough to be united. We can, of course, go only by the figure 

 and description and by the opinions of Greville and Ralfs; bu< in the absence oi 

 material to examine, 1 consider il besl to drop Shad bolt 'a species oul of thi 

 and unite the other forms above enumerated under the name given by Greville. 



Found al station 3698, off Eonshu [sland, Japan. 

 Biddulphia subjuncta Mann, Bp. nov. E XLVI, figi RE !. 



Vah e square, the angles rounded and the sides slightly concave; marking of large, 

 flat bosses, < »\ al or subsquare, radially arranged from the center, which is without 

 hyaline area; central portion within a circle, one-half the diameter of the valve, flat, 

 thence the valve slightly convex to the border; thefourpro at the extremity 



of the rounded angles, broad, Dearly Bessile, with heavy investing rings and tipped 

 angle of 15° to the surface of the valve; each bead punctate with a strong central dot. 

 Width of valve, 0.063 mm. 



Type in the U. S. National Museum, No. 590140, from station 2808, Gala] 

 Islands April I. L888; 634 fathoms, bottom of coral sand. 



I am compelled to name this diatom, bul .1" so reluctantly. Ii is one-of a variable 

 group already including many close Bpecies, which will 1 1 * -* -< 1 eventually to 1"- revised 

 and condensed when subsequent intermediate forms are discovered. Ai such time 

 this species should probably disappear. In general markings it i- like Triceratium 

 biquadratum Jan.." except for the unimportanl difference of j circular instead of a 

 quadrate arrangement of the central portion of the valve, a character made prominent 

 in the name given by Janisch. lint in addition to the minor differences in marking, 

 the processes at the angles are very broad and sessile, like those figured in T. • 

 Grev.,6 a phase of Greville's species in rather too wide contrast to his own rep 

 tat inn.'' My specimen is, on the whole, nearest t" an unnamed figure of Schmidt's.** 

 Biddulphia turgida Eh ren 1». - .' W. Smith. Synop. Brit. Diat. 2: 50. pi 



L856. Roper, Trans. Micr. Soc. Lond. n. s. 7: 17. pi. t. f. 23. L859. Van Heur. 

 Syne].. 206. 1885. Boyer, Vv<<r. Acad. Phila. 1900: 711. 1901. 

 icella turgida Ehrenb. Ber. Akad. Wiss. Berl. 1840: 207. L841? 

 itaulus turgidus Ehrenb. Ber. Akad. Wiss. Berl. 1843: 271. 1844. Bail. 

 Smithson. Contr. Knowl. 2 8 : 39. pi. .'./. 16-27. 1851. Pritch. Hist. Infus. ed. 1. 

 846. pi. 6.f. 9. ism. Schmidt, Atlas pi. 115. f. 12-14, pi 116. f. IS. L888. Castr. 

 Rep. Voy. Chall. Bot. 2: L01. pi 26. f. 6, 8. L886. Rabh. Fl. Cur. Alg. 1: 313. 

 L864. 

 Odontella turgidaVzn Heur. Synop. pll04.f:l-2. L881. DeToni, Syll. Alg. 2: 



L894. 

 The specimens found at station 3694B are quite small and wholly destitute of the 

 two long spines. 



Found at stations 3694H, 3712H, I Okhotsk Sea. 



ISTHMIA Ag. 



Isthmia C. Ag. Consp. Diat. 55. L832. Ehrenb. [nfus. 208. L838. Kutz. Bacill. L37 

 L844. W. Smith. Synop. Brit. Diat. 2: 51. L856. Cleve, Bih. Sv. Vet. Akad. 

 Bandl.1": I". L873. O'Meara, Proc. Key. [rish Acad II. 2:279. !^7:>. Pritch. 

 Bist. [nfus. ed. i. 851. L861. De Toni, Syll. Alg. 2: 833. L894. Van Beur. Treat. 

 Diat. 451./. 175. 1896. 



"Schmi.lt. Atlas pi L886. 



''Schnii.lt. Atlas pi 99. f. 10 11. L886 

 • Trans. Micr. Soc. Lond. n. b. 14: 9. pi ?./. .-.. L866. 

 -/ Schmi.lt. Atlas pi 99. f. : ■ L88 

 31713 — vol H». pi 5 "7 —7 



