I 



352 CONTRIBUTIONS FROM TRE NATIONAL HERBARIUM. 



stauron as a subgonoric distinction. As such it i.s to be coiiimended, tluuigli T tliink 

 Cleve is hero inconyiBtent, as rh'un.staurum (original spelling) is as different from 

 his Stauronois as it is from Navi<'ula. 

 Found at station 303511, BcTing Sea. 



Navicula praetexta Ehronb. l^cr. Akad. Wiss. Berl. 1840: 214. 1841. Gn^g. Trans, 

 Roy. Soc. Edinb. 21: 481. jd, l.f. ll. 1857. Kiitz, Bacill. 98. 1844. Dunk. 

 Brit. Diat. 10. pL f . / /. ]871 73. O'Moara, Proc. Roy. Irish Acad. 11. 2: 387. 

 jpl, S2,f. 27. 1875. Schmidt, Alias pL 3.f. 30-S4. 1875; pi 129, f, 7-S. 1SS8. Van 



Heur. Rynop. f)2. pi 9.f. 13. 



f. 169. 1890. Rabh. 



n. Eur. Alg. 1: 183. 18G4. Prit<'h. Hist. Infus. (hI 4. 898. 1801. Witt, Verb. 

 Russ. Min. Gcs. II. 22: 105. pi 9 J. 4. 1880. Pant. livWr. Bacill. Ung. 1: 30. pi 

 9, / 79. 1880. Truan, Anal. Soo. Espan. Hist. Nat. 13: 44. pi ^. f. 27. 1884.. 

 Cleve, Sv. Vet. Akad. Handl. 27"^: 55. 1895. Oc Toni, Sylb Alg. 2: 102. 189L 

 Wollc, Diat. N. A. pi 20. f. 1, 7 (not pi 111, J. 3), 1890. Truan & Wilt, Diat, 



/. 8. 1888. 



/ 



/ 



Navicula Jmyliana Truan & Witt, Diat. Hayti pi 4. J. 9. 1888. 



Navicula rcticulo'radlafa Te>inp. & Brun, Mem. Soc. Phys. et Hist. Nal. Geneva 30^: 



44. pi .5./ 4. 1889. Schmidt, Atlas pi 204J. IS. 1897. Cleve, Sv. Vet. Akad. 



Handl. 27"^: 55. 1895. 



It is somewhat of a stretch to include here the abovi^-named synonym of Pantocsek's; 

 but the very suggestive figure cited above by Truan A Witt is so evident a conunent 

 on the validity of Pantocsek's spiK-ies that I follow Cleve in joining them. I think 

 that with almost ecinal reason another figure on the sanu^ plate, « called V. ncupaiierii 

 Pant., could l)e classed here. De^ Toui & and Cleve c iurlude N. haytinna, as above. 

 Three reasons are given by the ainliors for holding it separate from A"", praetexla. The 

 best answer to tbes(^ is found in compuring th<Mr om'h figures of llie two species on plate 

 4, figures 8 to 9. This particular form, hmjtlana, is found at station 2807 in company 

 with the true type. 



Found at stations 2807, 2920II, Galapagos and Hawaiian islands. 



Navicula prodiga Mann, sp. nnv. Plate LIII, ficuhe 4. 



Valve outline of (> perf(H-tly straiglil lines forming an elongated hexagon, the apices 

 alone l)eing ronndt^d; the two nuHlian sides shorter than those running to the apices; 

 markings of moniliforni striai^ arranged in the general lyrate ])attern, the striae u{ hirge 

 rounded l)eads, the actually inedian striae alone being transverse, those on eith<^r side 

 of the middle curving and becomini,^ concentric to the two apices; interspaces between 

 the^ striae one-half the width of a brad; lyrate hyalini^ area narrow, its ends not 

 approaching, \w\\vxi the beadcnl rows on (^ach side of tin' raphe of nearly equal width 

 from cejiter to apices; marginal striae at the middle of ihv valve fully two-fifths its 

 width, tlu nee dijninishing toward tin* apices as the sid(>s approach; valve surface just 

 within tlu' margin all around <leprcssed, whereas tlu^ margin itself is sli^ditly elevated 

 above llie r(^st of the surface, thus producing the appt^arance of a border. 



Length of valve, 0.150 mm.; width of valve, 0.085 mm.: striae, 48 in 0.1 mm. 



The hexagonal form called N. hnimdyi cuncala Schmidt (/ resembles my species only 

 in its hexagonal outline. A far neari^r form in JanischVs Diatoms of the Gazelh^ Expe- 

 dition, plate 15, figure 23, is named .V. hjra €Hi/>aV<^ Schmidt by Cleve,-^ where it is 

 joined with figures in Van Heurck's Synopsis, plate 10, figure 2, Schmidt's Nordsee 



t^Pant. Beitr. Bacill, Ung. 1: pi 14. f. 123, 188C. 

 ^DeToni, Syll Alg. 2: 103. 1891. 

 cSv. Vet. Akad. Handl. 27"': 55, 1895. 

 dSclimidt, Atlas pi 3.f. 4. 1875. 

 ^Sv. Vet. Akad. Ilandh 27-^: G3. 1895, 



