KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 27. N:0 3, 109 



longitudinal line distinct on tlie dorsal side, at some distance from the median Hne. Ventral side 

 striate. Strite. 12 in 0,oi mm. not distinctly punctate. Strite crossed by an obsolate longitudinal 

 band. — Pl. IV f. 16, 17, 18. 



Marine: Labnan! 



This species resembles A. javanica, from whieh it differs by tbe scarcely punctate strise and 

 tbe complex zone. 



2. Å. crassa Greg. (1857). — Frustule linear-elliptical, with rounded ends. L. 0,05 to 

 0,1; B. 0,02 to 0,03 mm. Zone with about 3 divisions in 0, 01 mm. transversely costate; costae 5 

 in 0,01 mm. V. linear with obliquelj^ rounded, or snbcapitate and incurved, ends. L. 0, 04 5 to 0,09; 

 B. 0,008 to 0,02 mm. Median line biarcuate. Axial and central areas indistinct on the dorsal side. 

 Strise 5 to 8 in 0, 01 mm. punctate, crossed on the dorsal side by a longitudinal line. Ventral side 

 with somewhat radiate rows of puncta. — T. M. S. V. p. 72 Pl. I f. 35. D. of Clyde p. 524 

 Pl. XIV f. 94. Flögel Pommerania Exp. p. 90 f. 11. A. crassa var. A. S. Atl. XXXIX f. 30. 

 A. crassa var. punctata A. S. Atl. XXVIII f. 30 to '33. Pant. I p. 21 Pl. VI f. 46. A. Useriata 

 Greg. t. M. S. v p. 71 Pl. 1 f. 32 (1857)? A. sulcata Eopek M. J. VI p. 24 Pl. III f. 7 (1858). 

 A. thaitiana Castr. Voyage Challenger D. p. 19 Pl. XXVII f. 15 (1886)? 



Marine: Greenland! Spitsbergen! North Sea! Mediterranean! Adriatic! Sumatra! China! 

 Hungary, fossil (Pant.). 



Var. elongata Cl. — V. in L. 0, 15 to 0,19; B. O, o 2 to 0,022 mm. Eows of puncta 4 to 5 

 in 0,01 mm.; puncta about 8 in 0, 01 mm. 



Marine: Gulf of Naples (Deby Coll.)! Macassar Straits! 



Var. campe.cliiana Grun. (1875). — V. in L. 0,i to 0,1.^; B. 0,o2 mm. Dorsal strise 7 to 

 11 in 0,01 mm. punctate. Longitudinal line distinct. Ventral side with rows of puncta, more 

 distant than on the dorsal striai. — A. S. Atl. XXVIII f. 16. 



Marine: Macassar Straits! Campeachy Bay (Atl.), Pensacola! 



Var. interlineata Grove and Stdrt (1887). — V. in L. 0,0 9 to 0,17; B. 0,oi5 to 0,oi7 mm- 

 Dorsal stritB 9 in O.oi mm. punctate; puncta about 20 in 0, 01 mm. Longitudinal line distinct. 

 Ventral side with a row of marginal short strite or puncta. Zone with about 5 divisions in 0,oi 

 mm. transversely striate; strife 10 in 0, 01 mm. — ^4. interlineata Grove and Stdrt Quek. M. C. 

 J. (2) III p. 131 Pl. X f. 2. 



Marine: Oamaru, New Zealand, fossil! 



Var. sölswigiensis Petit (1888) p. p. — V. in L. 0,13; B. 0,oi9 mm. Stria; 6 in 0, 01 mm. 

 coarsely punctate. Ventral side with a marginal row of small puncta. — A. S. Atl. XXVIII f. 17. 

 Petit D. de Gap Horn p. 120 Pl. X f. 15. 



Marine: North Sea (Atl.). 



This form is nearly akin to the var. interlineata. Petit quotes as A. sölswigiensis the fig. 

 17 and 18 in Atl. Pl. XXVIII, which represent distinct forms, if not species. Petits own figure 

 (D. de Gap Horn Pl. X f. 15) is too indistinct for deciding what form the author denotes. 



Var. modesta Cl. — V. in L. (),06 5; B. 0,02 mm. Dorsal side with 6 rows of coarse puncta 

 in 0,0 1 mm. Longitudinal line distinct. Ventral side with a row of marginal strise. — A. S. 

 Atl. XXVIII f. 23? 



Marine: Tamatave (Kinker Coll.)! 



Var. euj]re2}es Pant. (1886). — V. in L. 0,us to 0,i; B. 0,ois mm. Dorsal side with 5 to 8 

 rows of distant puncta reaching to the median line, where the puncta become strong. Longitudinal 

 line indistinct. Ventral side striate at the ends. — Pant. I p. 21 Pl. XIV f. 128. 



Marine: Morocco (stria; 8 in 0,oi mm.); Hungary, fossil (strise 5 in (),oi mm. Pant.). 



Var. degenerata Cl. — L. 0, 05 to O.07; B. 0, 009 mm. Dorsal striie. coarse, punctate, 7 to 8 

 in 0,01 mm. Longitudinal line distinct. Ventral side smooth. 



Marine: China! Galapagos Islands! 



