MANN DIATOMS OP THE AT.BATEOSS. VOYAGES. 379 



Gnin<»\v, l)uL on too unimportant distinctions. The rather sharp conf^tri<lioii of the 

 valv(*s ut th(^ center on the dorsal side, and (^sj)ccially the heavi(^r l)(*ading of the dorsal 

 margin, sometimes extending a.^ ridges part "\^•ay across the valve^ are the marks of dis- 

 tinction. The apices are lial)Ie to be slightly curved veatrally. These characters of 

 Ilantz^scliia singly or together ar(? more or h'ss to he seen in other species of Nitzschia, 

 and ar(^ nut good generic marks. Van TIeurck retains the genus. It is instructive on 

 this poir\1 1(1 cinniKivc. Nitzadda bilolxtht W. Smilli witli Uaidz^chia (imfhio:nj^{VA\nH\\>.) 

 GrUH." 



t 



Nitzschia amphibia G run. Verh. Ztuthdint. Ges. Wi^u 12: 574, pL ^2,f. 23. 18^2. 



Cleve, Sv. Vet. Akad. Ilandl. 17-: !)S. ISSO. Van Ileur. SyiK.]). 184. pL 68. 



f. ;/W7. 1881-85. Kahh. FL Eur. Alg. 1: 157. ISlU. H. L. Sniilh, Sp. Diat. 



Typ. no. C88. 1874. De T<Mii, Sylh Alg. 2: 5-1'^ 1891. 

 Banllaria frauenfeliVii Gv\m. Verh. Znol. Hot . <ics. Wien 10: 584. pL l!.f. 1. 18G2, 



De T(mi, Syll. Alg. 2: 545. ISDT. 

 Nilzschla frauenfddil Grun. in Cleve & Oruii. Rv. Vet. Aka(h Ilandl. 17'-; 98. 1880. 



Van Ileur. Synop. pi 68. f. IS. 18ST. 

 NitzHchia actiuscula Grun.; A^an ITeiir. Synoj). pi. 68. f. 19-2S. 1881. 



Although the (original figures ol li.JniKenJiidll are nuich more tapering than thuse of 

 JV. awphihia^ a comparison of the. two as figuictl hy Van Heurck will show tludr idt^itity. 

 In fact, Gnmow says:^ "Nahe verwandt mil, V. awpliibia und wohl nur i'ini'langere 

 Foiiii dersell)en." The species is als:* Ino rlost^ to some other forms, as N. fofi<iiUs 

 Grun,'' and N. liehetndJni Ji'd\)h.^ Tlic fcrnuM* differs merely in much greater attenu- 

 ation, but as I have not s(hmi tlu^ dialnm T dn n<it inchuh' it with the above. 



Found at station 3091^ off Oregon. 



Nitzschia angustata (^W. Sniilh) (iruii. in Clcvc & Grun. Sv. Vet. Akad. TTaiull. 17'*-': 



70, 1H80. Van Ileur. Synoj). 172. pi. 57. f. 22-24. 1881. CU'vc .t Mr.ll. typ. 



no. 151-155. Do Tuni, Pyll. .\1<,'. 2: 500. Van Il<'ur. Treat. Dial. ;W5. pi. 1.5. 



f. 40S. 180G. 



Trybliondlaamjiiiilala W. Sinilli, Synop. ISriL. Dial. 1: 'M\. pi. M.J. 2f>2. lS.5;i. Rabli. 



Fl. Eur. AlJ,^ 1: 148. 18G4. rril.h. TTi.sl,. Tnfus. ed. 4. 792. ISGl. Rrun, DiaL. 



Alp. lO:^. pi 4-f. 28. 1880. 

 Nitzsdda marina GriiTt . in Cleve tt Tirun. Sv. Vel. Akad. Handl. 17-': 70. 18S0. Van 



Ileur. Synop. pi. 57.f.26^27. 1881. De Toni, Syll. Alg. 2: 500. 1891. Cleve in 



Nnrdenf?k. Vega Exi)ed. 3: 507. 188:5. WuWv, DIut. N. A. j^l- 44./. J^> (not/. 17). 



1892. 



Both Brun and TIabirshaw add to the above lifit Tryhllonella acuminata W. Smith, e 

 Thi.s is ineorrect. Nor can Habirshaw's uuiuii of Synedra praemorsa Ehreiib./ be 

 admitted. The ineaaurements of ^V. marina vary considerably in the firtit and fourth 

 citations above, the latter being much larg<T. 



Found at stations 2929, 451011, off southern California and in Gulf of California. 

 Nitzschia insignis Greg. Trans. Micr, Soc. T^trnd. n. s. 5: 80. jpl. /./. 4^', 46*- 1857. 

 Van Ileur. Synop. j)l. 61. f. 1. 1881; Treat. Diat. 391. pi. 32. f. S.1.5, S.1G. 1890. 

 Cleve & Grun. Sv. Vet. Akad. Ilandl. 17-: 8:5. 1880. De Toni, Syll. Alg. 2: 521. 

 1892 (not n.. D. Smith, Sp. Diat. Typ. no. 349. 1874 =JV. .'^calnris (Ehrenl),) W. 

 Smith). 

 Priichardia innujnis Rabh. Fl. Eur. Alg. 1: 163. 1804. 



«Van Ileur, Treat. Diat. pi. 15. f. 484b, 513. 1890. 



bSv. Vet. Akad. Ilandl. 17-: 99. 1880. 



cVan Hour. Synop. pi. 68. f. 24- 1881. 



(i Van neur. Synop. pi. 68. f. 25-26. 1881. 



eW. Smith, Synop. Bril. Diat. 1: 36. pi. 10. f. 77. 1853. 



/Bhys. Al)h. Akad. AViss. P.erl. 1841: pi. 3. Yl.f. 11. 1843 



