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



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

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

 band. — PL IV f. 16, 17, 18. 



Marine: Lab u an! 



This species resembles A. javanica, from which it differs by the scarcely punctate strise and 

 the complex zone. 



2. A. crassa Gkeg. (1857). -- Frustule linear-elliptical, with rounded ends. L. 0,o5 to 

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

 in 0,01 mm. V. linear with obliquely rounded, or subcapitate 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. 

 Striae 5 to 8 in 0,oi 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. Flogbl Pommerania Exp. p. 90 f. 11. A. erassa 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 I 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,i9; B. 0,o2 to 0,022 mm. Eows of puncta 4 to 5 

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



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



Var. campechiana Grun. (1875). — V. in L. 0,i to 0,is; B. 0,o2 mm. Dorsal striae 7 to 

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

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



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



Var. interlineata Grove and Sturt (1887). — V. in L. 0,09 to 0,17; B. 0,oi5 to 0,017 mm- 

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

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

 mm. transversely striate; striae 10 in 0,oi mm. — A. interlineata Grove and Sturt Quek. M. C. 

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



Marine: Oamaru, New Zealand, fossil! 



Var. solswigiensis Petit (1888) p. p. — V. in L. 0,13; B. 0,oi9 mm. Striae 6 in 0,oi mm. 

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

 Petit D. de Cap Horn p. 120 PL X f. 15. 



Marine: North Sea (Atl.). 



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

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

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



Var. modesta Cl. — -V. in L. 0,o6 5; B. 0,02 mm. Dorsal side with 6 rows of coarse puncta 

 in 0,01 mm. Longitudinal line distinct. Ventral side with a row of marginal striae. — A. S. 

 Atl. XXVIII f. 23? 



Marine: Tamatave (Kinker Coll.)! 



Var. euprepes Pant. (1886). — V. in L. 0,o8 to 0,i; B. 0,oi8 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 (striae 8 in 0,oi mm.); Hungary, fossil (striae 5 in 0,oi mm. Pant.). 



Var. degenerata Cl. — L. 0,o5 to 0,07; B. 0,oo9 mm. Dorsal striae coarse, punctate, 7 to 8 

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



Marine: China! Galapagos Islands! 



