Bacillarieas, Nitzschiacoae, Hantzschia. • 563 



Bengalia Asi;i3. — Var. amphiiepta (Ehr.?) Grun. in Cl. et Gr. Arct. 

 Diat. p. 103, Micr. Journ. 1880, t. 12, f. 8, Diat. Fr. Jos. Land 

 p. 48, Eunolia aniphilepta Ehrenb.?: valvis angustis, 50-100 ^ 

 5-7, apicibus Innge productis, angustatis; punctis carinalibus 6-8 

 striisque transversis 12-16 in 10 u.. In Bengalia Asise. — Var. 

 major Grun. in V. H. Syn. p. 109, t. 56, f. 3, 11, Diat. Fr. Jos. 

 Land p. 48: valvis majusculis, circ. 120 a. longis, punctis cari- 

 nalibus 5-6 striisque transversis 11 in 10 a. In Belgio. — Var. 

 intermedia Grun. in V. H. Syn. p. 169, t. 56, f. 4, loc. cit, p. 48: 

 mediocris, circiter 80 a. longa; punctis carinalibus 4 striisque 

 circiter 11 in 10 a. Cum prcficedeute. 



2. Hantzsciiia Weypreclitii Grun. in Cl. et Gr. Arct. Diat. p. 104, 2205 

 Diat. Fr. Jos. Land p. 55, t. A, f. 60. — Frustulis anguste li- 

 nearibus, valvis infequilateralibus, 55-75 =; 6-7, acuminatis, ventre 

 plano, dorso convexo; punctis carinalibus 9-11 in 10 a., in media 

 parte deficientibus; striis transversis tenuissimis, 32-35 in 10 [x. 



Hab. ad terram «Franz Josef» e fragmento glaciei. 



3. Hantzschia elongata (Hantzsch) Grun. in Cl. et Gr. Arct. Diat. 2206 

 p. 104, Nilzschia elongata Hantzsch ia Hedwigia 1860, t. 5, Eu~ 

 noiia Diance Ehrenb.?, Nitzschia amphioxijs var. elongata V. H. 

 Syn. p. 169, t. 56, f. 7-8. — Valvis elongatis, ad 300 a. longis ; 

 punctis carinalibus 7-8 striisque transversis 16-18 in 10 a. 



Ileb. in aqua dulci prope Dresdam Germanise (Hantzsch) ; fos- 

 silis ad «Rosenberg, Longh Mourne» nec non in Nova Zelandia etc. 

 (Hochstetter, Grunow). 



4. Hantzschia abyssinica Grun. in Martelli Flor. Bogos. p. 153, t. I. 2207 

 fig. 6, Notarisia 1886, pag. 193. — Parva, valvis linearibus, 33- 



37 =; 5 u., ante polos capitatos obtusos constrictis, in media parte 

 parum angustatis; striis tenuibus, circ. 30 in 10 u., punctis cari- 

 nalibus circ. 10 in 10 u.. 



Hab. ad «Scioteh) Africae (Beccari). 



B. Puncta carinaUa subprolongata (nec totara valvas latitudinem percur- 

 rentia). 



5. Hantzschia virgata (Roper) Grun. in Cl. et Gr. Arct. Diat. p. 104, 2208 

 V. H. Syn. p. 169, t. 56, f. 12-J3, Typ. n. 370, Nitzschia virgata 

 Roper in Micr. Journ. VI, p. 23, t. 3, f. 6, Pritchardia mrgata 

 Rabeuh. FI. Eur. Algar. 1, p. 163. — Valvis robustis, circiter 130 



a. longis, .dorso leviter arcuatis, ventre subrectis, apicibus rostra- 



