KONGL. SV. VET. AKADEMIENS HANDLNGAK. BAND 27. N:0 3. 139 



Subgenus Archiamphora, 



Frustule iinknown. Valves as in Calamphora, but the ventral side is without longitudinal 

 lines, and has a row of short strife or pnncta, either along the median line or between the median 

 line and the margin. 



The species of this snbgenns are all fonnd in a fossil state at Oamarn, New Zealand, ahvays 

 as detached valves. Yet they bear a eonsiderable likeness to the forms of Calamphnra, so that it 

 is possible that the zone may be complex; and, indeed, in specimens of A. fi.mbriata fragments of 

 the zone are fonnd which tend to show that it is similar to those of the subgenns Calamphora. 



Artificial hey. 



{Costae 4 to 5 in 0,oi mm 2. 

 — 6 to 7 — — A. fimbriata Cl. a. Gbove. 

 — ■ 11 — — A. antiqua Cl. a. Grove. 



„ I Puncta 9 ju 0,01 mm A. rcctilineata Cl. a. Grove. 



I Puncta 9 ju 0,01 mn 



\ - n - - 



A. prisca Cl. a. Grove. 



1. A. antiqua Cl. a. G-rove N. Sp. — V. linear, with obliqnely rounded ends. L. 0, 1:3; 

 B. 0,01,3 mm. Dorsal side with parallel costate striee, II in 0, 01 mm., alternating with rows of 

 pnncta, 24 in 0, 01 mm. Ventral side smooth, with a longitndinal median row of short strife, 

 11 in 0,0 1 mm. 



Marine: Oamarn, New Zealand, fossil (Grove CoU.)! 



2. A. rectilineata Cl. a. Grove N. Sp. — V. linear with obliqnely ronnded ends. L. 0,09; 

 B. 0,0 15 mm. Dorsal side with parallel costtx?, 4 in 0, 01 mm., alternating with donble rows of 

 pnncta, i) to 10 in 0, 01 mm., forming longitndinal rows. Ventral side smooth, with a median band 

 of short, puncta-like strife, 6 in 0, 01 mm. — Pl. IV f. 24, 25. 



Marine: Oamarn, New Zealand, fossil (Grove Coll.)! 



3. A. fimbriata Cl. a. Grove N. Sp. — V. linear with oblicjely ronnded ends. L. 0, 14 to 

 0,18 mm. Dorsal side with parallel stricE, 6 to 7 in 0, 01 mm. Ventral side with a row of short 

 strife, close to the median lire. 



Marine: Oamani, New Zealand, fossil (Grove Coll.)! 



4. A. prisca Cl. a. Grove N. Sp. — V. linear, with obliqnely ronnded ends. L. 0, 14 to 

 0,16; B. 0,016 to 0,022 mm. Dorsal side with parallel costate strife, 4 to 5 in 0, 01 mm. Inter- 

 mediate spaces transversely lineate; lineolfe 11 in 0,oi mm. Ventral side with a row of short 

 radiate striai along the median line, otherwise strnctureless. 



Marine: Oamarn, New Zealand, fossil (Grove Coll.)! 



Addltional. 



Amphoree, ivhich cannot for the present be grouped in amj of the above subgenera. 



1. Ampliora elegaus Perag. (1894). — Frnstnle elongated, narrow, with slightly convex 

 margins and truncate ends. L. 0, 09; B. 0,015 mm. Zone not complex V. narrow Innate, acute. 

 L. 0,08; B. 0,01 mm. Central nodnle dilated into a stauros. No areas and no longitndinal lines. 

 Strife eqnidistant 011 the dorsal and ventral side, 22 in 0, 01 mm. distinctly punctate; pnncta 25 

 in 0,01 mm. arranged in straight longitndinal rows. — Temp. a. Perag. Types N:o 414. Diatomiste 

 II p. 56 Pl. III f. 8. 



Marine: Cabours. 



This remarkable species has the same structure as the Naviculfe of the section Orthostichce 

 and might be considered as an asymmetrical form of this section. 



