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



mucronate on inner side. Connecting zone complex, with 4 to 5 divisions in 0,oi mm. Along the keel 

 is a row of puncta, 7 to 10 in 0,oi mm. Striae 35 to 40 in 0,oi mm., extremely difficult 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, Grullmarsfjord 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. The specimen figured is too imperfect to admit of a description. It is probably the same 

 species as Amphiprora punctata Pant. Ill PL XXXIX f. 547. 



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

 middle. L. 0,o89 to 0,102; B. 0,07 mm. Connecting zone with 7 to 8 divisions (about 2 in 0,oi mm.) 

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

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

 nodule, about 20 in 0,oi mm. — Amphiprora complexa Gtreg. D. of Clyde p. 508 PL XII f. 62. 

 Auricula Oprcea 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. Ostrsea is in all respects similar to A. complexa, except as to the number of strige, which ac- 

 cording to Brun and Tempjire are only 7 to 9 in 0,oi mm. 



6. Auricula minuta Cl. N. Sp. — Frustule quadrate with rounded angles. L. and 



B. 0,02 to 0,05 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,oi mm.) along the median line. 

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

 PL I f. 7, 8. 



Marine: Sweden, Grullmarsfjord on Zostera and among Amphipleura (Berkeleya) DiUwynii, 

 frequent! 



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

 slightly constricted. L. 0,o7; B. 0,03 mm. Median line strongly inflected towards the centre of 

 the frustule. Along Jt is a row of puncta, 5 in 0,oi mm. V. in outline narrow, reniform. L. 0,07 

 to 0,11; B. 0,0 2 5 mm. Median line excentric, diverging from the central nodule towards the dorsal 

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

 Amphora intermedia Lewis. Proc. Philad. Ac. Nat. Sc. PL I f . 7 (1865). Auricula japonica Br. 

 and Tempore, D. foss. du Japon p. 25 Pi. 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. javanica Cl. N. Sp. — Valve linear-lunate, very slightly constricted in the middle. 

 L. 0,17; B. 0,026 mm. Median line very excentric not inflected, close to the margin of the valve 

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



— PL II f. 22. 



Marine: Sumbava (Kinker Coll.)! 



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

 excentric, closer to the outer margin, to which its exterior wall is vertical. The interior wall 

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

 margin. Striae about 8 in 0,oi mm., undulating, not distinctly punctate, on the interior wall of 

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



