KONGL. SV. VET. AKADKMIKNS HANDLNGAH. BAND 27. \:() 3. ] IV.) 



Subgenus Archiamphora. 



Frustule unknown. Valves as in Calaniphora, l)ut the ventral side is without longitudinal 

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

 line and the margin. 



The species of this subgenus are all found in a fossil state at Oamaru, New Zealand, always 

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

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

 the zone are found which tend to show that it is similar to those of the subgenus Calaniphora. 



Artificial hey. 



i CostfB 4 to f\ in 0,01 mm 2. 



1- •> — (i to 7 — — A. fimhriata Cl. a. Grove. 



( — 11 — — A. antiqua Ci,. a. Grove. 



„ ( Puneta y in 0,0 1 

 ''• i - 11 - 



mm A. rectilineata Cl. a. Grove. 



— A. prisca Ch. a. Grove. 



1. A. antiqua Cl. a. GtROVE N. Sp. — V. linear, with obliquely rounded ends. L. 0.i:i; 

 B. 0,0 13 mm. Dorsal side Avith parallel costate strife, 11 in (),oi mm., alternating with rows of 

 puneta, 24 in 0,oi mm. Ventral side smooth, with a longitudinal median row of short stria?, 

 11 in 0,0 1 mm. 



Marine: Oamaru, New Zealand, fossil ((Irove Coll.)! 



2. A. rectilineata Cl. a. Grove N. Sp. — V. linear with obli(|uely rounded ends. L. 0,u'j; 

 B. 0,01.") mm. Dorsal side with parallel costa% 4 in 0,oi mm., alternating with doul^le rows of 

 puneta, y to 10 in 0,oi mm., forming longitiidinal rows. Ventral side smooth, with a median band 

 of short, puncta-like strijE, in 0,oi mm. — PI. IV f. 24, 25. 



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



3. A. flmbriata Cl. a. Grove N. Sp. — V. linear with obliqely rounded ends. L. 0,i4 to 

 0,18 mm. Dorsal side with parallel stritv, 6 to 7 in (),oi mm. Ventral side with a row of short 

 strite, close to the median line. 



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



4. A. prisca Cl. a. Grove N. Sp. — V. linear, with obliquely rounded ends. L. 0, i4 to 

 0,16; B. 0,0 16 to 0,0 2 2 mm. Dorsal side with parallel costate stria-, 4 to 5 in 0,oi mm. Inter- 

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

 radiate strite along the median line, otherwise structureless. 



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



Additional. 



Amphorce, ivhich cannot for the presoit he (jrouped in any of the ahove subgenera. 



1. Amphora elegans Perag. (1^94). — Frustule elongated, narrow, with slightly convex 

 margins and truncate ends. L. 0,o9; B. 0,oir) mm. Zone not complex V. narrow lunate, acute. 

 L. 0,08; B. 0,0 1 mm. Central nodule dilated into a stauros. No areas and no longitudinal lines. 

 Stria' equidistant on the dorsal and ventral side, 22 in 0,0 1 mm. distinctly punctate; puneta 25 

 in 0,0 1 mm. arranged in straight longitudinal rows. — Temp. a. Perag. Types N:o 414. Diatomiste 

 II p. 56 PI. Ill f. 8. 



Marine: Cabours. 



This remarkable species has the same structure as the Naviculre of the section Orthostichoe 

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



