KONCL. SV. Vl-'/r. AKADKMIKNS IIANI)IJN(i AK. HANI). 27. Xro 3. 1 Ol> 



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

 striate. Stria-. 12 in (),oi mm. not distinctly punctate. Striic. crossed hy an obsolate hjngitudinal 

 band. — PI. IV f. 16, 17, 1«. 



Marine: Lab nan! 



This species resembles A. juvanica, from which it differs by the scarcely piituttate strife and 

 the complex zone. 



2. A. crassii GtReg. (1857). - Frustule linear-elliptical, with rounded ends. L. 0,o.5 to 

 0. i; B. 0,02 to 0,0.3 mm. Zone with about 3 divisions in 0,oi mm. transversely costate; oostae 5 

 in 0,0 1 mm. V. linear with obliquely rounded, or subcapitate and incurved, ends. L. 0,o4 5to0,o9; 

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

 Stripe 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 PI. I f. 35. 1). of Clyde p. 524 

 PI. XIV f. 94. Flogel Pommerania Exp. p. 90 f. 11. A. cra.ssa var. A. S. Atl. XXXIX f. 30. 

 A. crassa var. punctata A. S. Atl. XXVIII f. 30 to 33. Pant. I p. 21 PI. VI f. 46. A. biseriata 

 Greg. T. M. S. V p. 71 PI. I f. 32 (1857)? A. sulcata Roper M. J. VI p. 24 PI. Ill f. 7 (1858). 

 A. thaitkma Castr. Voyage Challenger D. p. 19 PI. XXVII f. 15 (1886)? 



Marine: (rreenland! Spitsbergen! North Sea! Mediterranean! Adriatic! Sumatra! (Miina! 

 Hungary, fossil (Pant.). 



Var. eloncjata Cl. — V. in L. 0, !.=> to 0,19; B. 0,o2 to 0,022 mm. Rows of puncta 4 to 5 

 in 0.0 1 mm.; puncta about 8 in 0,oi mm. 



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



Var. campechiana Grun. (1875). — V. in L. 0. 1 to 0, i.^; B. 0,02 mm. Dorsal strife, 7 to 

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

 distant than on the dorsal strife. - 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 0,1?; B. 0,oi5 to 0,oi7 mm- 

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

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

 mm. transversely striate; strifr 10 in O.oi mm. — A. interlineata Grove and Sturt Quek. M. C. 

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



Marine: Oamaru, New Zealand, fos.sil! 



Var. sohwigiensis Petit (1888) p. p. -— V. in L. 0,13; B. 0,oi9 mm. Strict 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 PI. X f. 15. 



Marine: North Sea (Atl.). 



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

 17 and 1« 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. 0,0 6f. ; 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 striee. — A. S. 

 Atl. XXVIII f. 23? 



Marine: Tamatave (Kinker Coll.)! 



Var. enprepes Pant. (1886). — V. in L. 0,o(s to 0,i; P). 0,0 is mm. Dorsal side with 5 to 8 

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

 line indistinct. Venti'al side striate at the ends. — Pant. I p. 21 PL XIV f. 128. 



Marine: Morocco (strife X in O.o 1 mm.); Hungary, fossil (strife. 5 in 0,oi mm. Pant.). 



Var. (lefienerata Cl. -- L. O.or) to O.07; B. O.009 mm. Dorsal strife coarse, punctate, 7 to 8 

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



Marine: China! Galapagos Islands! 



