mm. 



356 CONTIiTBUTIOKS FROM THE NATIONAL HERBARIUM, 



valvo correspoiultHl exactly to liis Hguro and tlio other showed tlio sun-like ray.s aruund 

 the cent(T, referred to in the specific name. I find a minute error in focusinjj inten- 

 sifies this '^Holar" effect, wliicli mu^t be the method by which such greatly exag- 

 gerated rf^prcsentations a« that by O'Meara were obtained'^. 

 Found at stations 3G07, 3611, Bering Sea. 



Navicula speciosa Mann, sp. nov. Plate LII, figuht: 5. 



Valve deeply constricted at the middle; the two halves broadest just beyond this 

 conistriction; thence narrowing rapidly to the blunt, roundt^l apicey; striae monil- 

 iform, except at the constriction, where they arc fused into three ridges; beada large, 

 oval, the marginal ones d(Hibh^ the h^ngtli of the others; striae toward tlie middle of 

 the valve ol>lique to the raphe, but not curved, toward the a]iices becoming curved; 

 a single row of large beads on either bide of the median line; ends of the raphe at the 

 center separated by a small hyaline round area, the central nodule. 



Length of valve, 0.12 mm. ; width of valves 0.045 mm., and at the middle, 0.012 

 Type in the U. S. National Museum, No. 50O15O, from statitm 2807, Galapagos Islands, 

 April 4, 1SS8; 812 fathoms, bottom of Globigerina ooze and coral mud, 



Navicula spectabilis Greg. Trans. Roy. Soc. Edinb. 21: 481. pi. 9.f. 10. 1857. Rahh. 

 Fl. Eur. Alg. 1: 178. 18G4, Schmidt, Atlas pi. 2.f. SI, pi SJ. 20-21, 29. 1875. 

 Donk. Brit. Diat. 12. ph 2. J, 5. 1871-73. Oleve, Sv. Vet. Akad. Hundl. 27"^: (iO. 

 1895. Castr, Rep. Voy. Ohall. Bot. 2: 32. pi, 28. f, 9. 1880. De Toni, Syll. Alg, 

 2:98.1891. Pritch. Hist. Infus. ed. 4.898,1861. O'Meara, Proc. Roy. Irish 

 Acad. II. 2: 390. 1875. Van Ileur. Treat. Diat. 202. pi 21. f. 757. 189G (not N. 

 sperfahili,^ Grun. Verb. Zool, Bot. Ges. Wien 10: 533. pi l.f. 11, 18G0). 



Navicula crravata Grev. variety; Schmidt, Atlas pi 3. f. 22-25, 1875 (not K exeavala 

 (5rev.). Jan. Diat. Gaz. Exped. pi 15. f. 22. Cleve, Sv. Vet. Akad. Handl. 18-': 

 8. pi 2.f. 20. 1881 (not Schmidt, Atlas pi 70. f. 46. 1 SS I , according to Grun.). 



Navicula mikado Pant. Bc-itr. Bacill. Ung. 3: pi 23. f. 334, \m\. 



Althougti the figures above cited of N. excacala Grev. variety are clearly synonyms 

 of this species, I do not think the original form of Greville's diatoTn,a nor the figure so 

 named by Grunow,^ can safely be lookt^d up<»n a.s the same. B(^yond question N. 

 o'sualdUJan.c is the same as Greville's species, as Grtmow points out.* But when 

 we compare any of these (igmes of N. excavafa which are in harmony with the original 

 with tlie type of N. i^peciabilis as given by Gr(>gory or in the su])erb figure by Donkin, 

 it is plainly too wide a stretch to cover both forms by one specific name. As Cleve 

 says, this species merges toward N, hjra Ehrenb., on the one luuid, and N. hennedyi \\\ 

 Smith, on the other; Imt if it is to be a species at all and have any boundaries, it can 

 not include Greville's diatom. Nor is Clcve correct in adding to l1h> above synonymy 

 N. bullata Norm.'^ and A^ mtlrayi Pant.e If we wish to see the result of this over con- 

 densation on the part of Clcve, we can not do better than coinj)are ligurc^s 46 and 52 m 

 plate 70 of Schmidt's Atlas, both of which he ranges under N spectabilis. Such a 

 '^species" is out of all bounds and not worth retaining. 



Found at stations 2807, 2920H, Galapagos and llaAvaiian islands. 



NaviculasplendidaGreg.Trans.Micr.Soc.Eond.n.s.4: AA.plo.f.U. 185G. Pritcli. 

 Hist. Infus. ed. 4. 893. Schmidt, Jahresh. Komm. Deut. Meere 2: 85. pi l.f. S-4; 

 pl.2.f.2. J874;Ai\ii^ pi 13./, 31-34. 1S75] pi 69, f. 22. 1881. Van, Heur. Synop! 



« Trans. Micr. Soc. Lend. n. s. 14; 130. pL 12, f, 15. 1800. 

 ^^ Schmidt, Atla.s pZ. 70./. ^(9. 1881. 



cSchmidt, Atlas pi 70./ 4^. 1881. Jan. Diat. Gaz. Exped. pi 15./. 12. Pant. 



Beitr. Bacill. Ung. 3: 52. pi 25./. 310. 1889. 



51-52. I SSI. 



/ 10, 1880. Schmidt, Atlas pi 70./ 



<^Pant. Beitr. Bacill. Ung. 2: 52. pi, 30./. 427. 1889, 



