KONGL. SV. VET. AKADKMlRNS M ANDLINGATJ. BAND 26. K:() 2. 17 



Var. suhtilis G-iuin. (1884). — Frustule scarcely constricted. L. 0,04; B. 0,oi4 mm. Jimction- 

 line sliglitly nndulated. Striffi lo (keel) to 26 (valve) in 0,oi mm. V. in B. 0,o8 mm. — A. Jcariana 

 r. suUtlis Grun. Franz .Jo.seplis L. D. p. 105 (53) Pl. I f. 52, 53. 



Marine: Franz Josephs Land (Grun.). 



Var. striolata Grun. (1880). — Frustule rectangular, .slightly constricted. L. 0,07; B. 0,023, 

 at the constriction 0,oi5 ram. Junction-line not .sinuose. StriiS 12 (keel) to 15 (valve) in O, ui mm. 

 those on the keel ending in small döts. — Grun. A. D. p. 62 Pl. IV f. 81. 



Brackisli water: Sea of Kära (Grön.). 



8. A. kryophila Cl. (1883). — Frustule sliglitly constricted. L. 0, 13 to O.ie; B. 0,04.3 to 

 0,045; at the constriction 0, 028 to 0,03 mm. Junction-line sinuose. Strite on the keel 13 to 17 in 

 0,01 mm., ending in small puncta; strise on the valve 10 to 14 in 0, 01 mm. wider than on the keel. 

 V. lanceolate, with strongly sigraoid median line. — Cl. Vega p. 477 Pl. XXXV f. 11. 



Marine: Cape Wankarema! 



A. kryophila is perhaps not specifically distinct from A. /v7't'?/»;(ft;)«V, the only difFerence being 

 that the striaj on the keel are closer than those ou the valve; otherwise the two forms are perfectly 

 similar. Both differ from A. paJudosa in large size, inore strongly silicious valves, and coarser striae. 



9. A. lata Grev. (1863). — Frustule ipiadrate, .strongly constricted. L. 0,07 5; B. 0,o4, at 

 the constriction U,0 2 5 mm. Keel broad. Junction-line uniformly arcuate, not sinuose. Strite on 

 the keel 11 to 12 in 0,oi mm. ending in small puncta. Strife on the valve of equal number, not 

 distinctly punctate. Connecting zoue with immernus, longitudinal divisions. — Grev. Edinb. N. 

 Phil. J. XVIII p. 38 f. 14. — Pl. I f. 5. 



Marine: Balearic Islands! Queensland (Grev.). 



The above description is from specimens from the Balearic Islands. Greville does not give 

 the number of strire. 



10. A. Meiicghiniana Grev. (1863). — Frustule broad, quadrate. L. O,!!.-) mm. Connecting 

 zone with numerous longitudinal divisions. JunctionJine uniformly arcuate. not sinuose. Strise 

 coarse 6 in 0,0 1 mm. — Grev. Edinb. N. Ph. J. XVIII p. 184 f. 7. 



Marine: Queensland (Grev.). 



11. A. Brebissoniaiia Grev. (1863). — .Frustule strongly siliceous, deeply constricted, with 

 broad truncate ends. L. 0,089 to O.is; B. O,occ mm. Junction-line not sinuose. Keel very elevated, 

 bordered with a conspicuose hyaline margin, obsoletely striate, the strife being visible only at the 

 median line and at the junction-line. Striffi of the valve 7,s in 0,oi mm., obscurely but coarsely 

 punctate. - Grev. Edinb'. N. Ph. J. XVIII p. 185 f. 8. — Pl. I f. 4. 



Marine: South Pacific Ocean (Grev.), Sendai, Japan, fossil (Tempere)! 



12. A. niargine-punctata Cl. N. Sp. — V. in L. 0,13; B. 0,o4, at the consti-iction 0,015 mm. 

 Keel very elevated, with a row of small marginal puncta, 8 in 0, 01 mm., connected with similar 

 rows of puncta at the basis of the keel. Lower part of the valve very narrow. Strite on the keel 

 19 in 0,01 mm., curved and finely punctate. — Pl. I f. 3. 



Marine: Java! 



13. A. Temporei Cl. (1890). — Frustule strongly eon.stricted. L. 0,15; B. 0,0 5.s at the 

 constriction 0,0 2 7 mm. Junction-line obsolete, visible only near the central nodule. Keel with two 

 rows of large puncta (4 in 0,oi mm.), striate; strise 21 in 0,oi mm. V. with fine, scattered puncta. 

 Connecting zone with numerous longitudinal divisions, transversely striate; stria^. 20 in0,oi mm. — 

 Cl. Diatomiste I p. 2 Pl. II f. 3. 



Marine : Madagascar ! 



This is a very characteristic species, not closely connected with any other. The median line 

 is strongly sigmoid. 



K. Sv. Vet. AkiukMiiicns Humllingar. Bd 26. N:o 2. 3 



