KONGL. SV. VKT. AKADKMIKNS H ANDLINr; A IJ. liAND 27. N:() 3. 133 



1. A. I)i«-??il)0sa (!i,. N. Sp. V. witii two gibbosities on the middle of tin- (b)r.sal side. 

 L. 0,1 ; 13. 0,01 ti inin. Central nodule not dilated into a «tauros. Stria' IK in O.m nnii,, jjunctate; 

 puncta 20 in 0,01 mm. — ,1. sp. A. S. Atl. XL f. 14. 



Marine: (lulf of Naples (Brun Coll.)! (4u]f' of Mexico (A. S. Atl.). 



I have not seen entire frnstules, so I cannot decide whether this species really belongs to 

 the section FsammaDtphofa or Aniblijatnphora. To judge from the fig. in Atl., which represents 

 an entire frustnle, the zone is not complex, and in sncli ease this s])ecies is akin to .1. (irmaria. 



2. A. aiTiiariii Doxk. (1s:)3). Frustnle hyaline, rectangular. \j. 0,i toO,i-, ; B. 0,(ii mm. 

 V. linear, with broad ventral side. Strite very tine, 24 to 27 in 0,o 1 mm. parallel. 



Forma typica. — Frustnle with rounded angles and somewhat gibbons middle. L. 0,1 to 

 0,1.',; B. 0,04 mm. Strise 27 in 0,oi mm. — A. arenaria Donk. T. M. S. VI p. 31 PI. Ill f. 16. 



A. S. Atl. XL f. 8, 9, 10, 12. V. H. T. N:o 13. H. L. Sm. I N:o 30. 



Marine (testuaries): North Sea! Hungary, fossil (Pant.). 



Var. Donhinii Rabh. (18fi4). — Frustnle elliptic-rectangular to rectangular. L. 0,o76 to 0,i ; 



B. 0,o;5 to 0,04 mm. StritE 24 to 25 in 0,oi mm. — A. liiicolata Donk. Q. M. J I. N. S. p. 12 

 PI. 1 f. 13 (18(U). J. Doukinii Rabh. F. E. A. p. 96. 



Marine pestuaries: North Sea! Cape May! 



Var. Kattfayi Cl. (1882). — Frustnle rectangular, with truncate ends. L. OjOS.'j to 0,o4; 

 B. 0,0 1 r> to 0,0 17 mm. Stripe extremely fine. — .4. liattrmji Cl. M. D. N:o 310. 

 j\Iarine: Estuaries: Scotland! Belgium! 



3. A. ocellata Donk. (IKCl). — Frustnle rectangular. L. 0,or to 0,ii; B. 0,o28 to 0,o3.5 

 mm. Valve in breadth 0,o.'j mm. linear. Central nodule on the dorsal side dilated into a stauros. 

 Terminal fissures small. Striic 17 to 21 in 0,oi mm. punctate. Ventral side as broad as the 

 dorsal, finely striate. Striie in the middle between the central nodule and the ends divergent 

 towards the median line. 



Var. tyirica Cl. — L. 0,0 6 to 0,o',t mm. Stria? 21 in 0,oi mm. composed of j)uncta, about 

 24 in 0,0 1 mm. — A. ocell. Donk. Q. M. J. N. S. I p. 11 PI. I f. 11. V. H. Syn. p. 56 PI. I f. 26. 



Marine: Coasts of Sweden! Belgium! England! Adriatic! 



Var. cinyulatd Cl. (1878). — L. 0,o85 to 0,12; B. 0,oi5 mm. Strite 17 in 0,oi mm.; puncta 

 20 in 0,01 mm. — A. cingulnta Cl. D. AV. Ind. Arch. p. 9 PI. Ill f. 15. A. S. Atl. XXVI f. 17. 

 Icon. n. PI. Ill f. 39. 



Marine: Gulf of Mexico! Pensacola! West Indies! N. Carolina! 



Var.y interrupta Pant. (1886). — V. more lunate. L. 0,079; B. 0,oi.? mm. Striae 20 in 

 0,01 mm. — A. (ostrearia?) inttrrnpta Pant. I p. 21 PI. XV f. 134. 



Marine: Hungary, fossil (Pant.). 



As entire frnstules have not been seen, it is doubtful whether this form really belongs to 

 A. ocellata. A very similar valve in Van Hburck's Coll. from Sumatra has 17 stripe and 17 puncta 

 in 0,01 mm. 



Var.? oamaruensis Cl. — V. in L. 0, is; B. 0,02 6 mm. Stauros obscure. Transverse stripe 

 16, puncta 14 in 0,oi mm. 



Marine: Oamarn (Grove Coll.)! 



As A. utauropliora Dannfeldt (Baltic D. p. 20 PI. I f. 9) has described a very small Amphora 

 (only 0,0 14 mm. in length), which seems to belong to this section, biit having had no opportunity 

 of examining it, I am unable to decide about its affinities. 



4. A. Pleurosignia Temp, and Brun (1889). — Frustnle thin and flat, rectangular, with 

 rounded angles. L. 0,12 to 0, le; B. 0,0 4 2 mm. V. in breadth about 0,o2 mm. Ventral side ap- 

 pearently broader than the dorsal. Central nodiile dilated to a stauros. Structure, fine puncta 

 disposed in lines crossing each other in the angle of 65'. — D. Foss. du Japon p. 15 PI. VII f. 8. 



Marine: Japan, fossil (Br. et Temp.). 



