KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 21 



mncronate on innex' side. Connecting zone complex, with 4 to 5 divisions in 0,oi mm. Alongthekeel 

 is a row of puncta, 7 to 10 in 0,oi mm. Strife 35 to 40 in 0,oi mm., extremely difRcult to resolve. 



— Amphora ? insecta A. S. Atl. XL f. 2, 3. Amphora mucronata H. L. Sm. Types N:o 38. Am. 

 Qu. M. J. 1878 p. 17 Pl. III f. 9. 



Marine and pelagic: Sweden, GuUmarsfjord on Zostera! Honduras (Grun.), Atlantic City 

 (H. L. Sm.). 



A probably allied, and very large, form is Amphora ? incerta A. S. Atl. XL f. 1 from Balt- 

 schick. Tlie specimen figured is too imperfect to admit of a description. It is probably the same 

 species as Ampliiprora punctata Pant. III Pl. XXXIX f. 547. 



5. A. complexa G-reg. (1857). — Frnstule (luadrate with rounded angles, constricted in the 

 middle. L. 0,089 to 0,102; B. 0,07 mm. Connecting zone with 7 to 8 divisions (about 2 in 0,oi mm.) 

 transversely striatie. V. with reniform outline, and very excentric elevated keel, along which is a 

 row of puncta, about 8 in 0,oi mm. Strise of the valve cnrved and divergent from the central 

 nodnle, about 20 in 0,oi mm. — Amp)hiprora complexa Greg. D. of Clyde p. 508 Pl. XII f. 62. 

 Aiiricula Ostrcea Temp. a. Brun. D. foss. du Japon p. 25 Pl. IV f. 7 (1889)? 



Marine, pelagic: Scotland! Balearic Islands! Rembang Bay (Debys Coll.)! Japan, fossil (Br. 

 a. Temp.)? Barbados! 



This species, remarkable for its excentric keel, is rarely found in entire frustules, the thin 

 connecting zone being usually detatched in the course of preparation from the more silicious valves. 



A. Ostrgea is in all respects similar to A. complexa, except as to the number of strise, which ac- 

 cording to Brun and Tempére are only 7 to 9 in 0, 01 mm. 



6. Auricula niinuta Cl. N. Sp. — Frnstule quadrate with rounded angles. L. and 



B. 0,02 to 0,o.T mm. Zone thin with about 7 divisions in 0,oi mm. V. reniform. very slightly 

 indented in the middle. Margin with a row of puncta (7 in 0, 01 mm.) along the median line. 

 Striis about 25 in 0,oi mm. delicate, almost parallel in the middle, curved at the ends. — 

 Pl. I f. 7, 8. 



Marine: Sweden, GuUmarsfjord on Zostera and among Amphipleura (Berkeleya) Dillwynii, 

 frequent ! 



7. A. iutermedia Lewis (1865). — Frustule elongated, rectangular with rounded angles, very 

 slightly constricted. L. 0,07; B. 0,0 3 mm. Median line strongly inflected towards the centre of 

 the frustule. Along it is a row of puncta, 5 in 0,oi mm. V. in outline uarrow, reniform. L. 0,o7 

 to 0,11; B. 0,0 2. T mm. Median line excentric, diverging from the central nodule towards the dorsal 

 side of the valve. Strise 15 to 16 in 0, 01 mm. curved and divergent towards the median line. — 

 Amphora iutermedia Lewis. Proc. Philad. Ac. Nat. Se. Pl. I f. 7 (1865). Auricula japonica Br. 

 and Tempére, D. foss. du .Japon p. 25 Pl. IV f. 8 (1889). 



Marine: Adriatic! China! Japan, foss. (Br., Temp.), South Pacific Ocean (Van Heurcks Coll.)! 

 Port Jackson! New Jersey (Lewis), Honduras (Grun.). 



8. A. javauica Cl. N. Sp. — Valve linear-lunate, very slightly constricted in the middle. 

 L. 0,17; B. 0,0 2 6 mm. Median line very excentric not inflected, close to the margin of the valve 

 and not bordered by a row of puncta. Strite 8, 5 in 0,oi mm., almost transverse, tinely punctate. 



— Pl. II f 22. 



Marine: SumbaA'a (Kinker Coll.)! 



9. A. Ampliitritis Castrac. (1873). — V. reniform. L. 0,055; B. 0,025 mm. Keel very 

 excentric, doser to tlie outer margin, to which its exteriör wall is vertical. The interiör wall 

 seems to be elevated in the middle, and to slope gently towards the somewhat sinuose interiör 

 margin. Stri;e about 8 in 0, 01 mm., undulating, not distinctly punctate, on the interiör wall of 

 the keel alternately longer and shorter towards the keel, to which they diverge. — Castr. Atti del 



