KONOL. SV. VKT. AK ADKMIKN.S II AN! )LI\(; A!!. BAND 27. Xro 3. ]l^>] 



The t'ofms ('(imjirist'd in this suhgcinis agree in all I'csix'cts, except in the (•(niiplex nittnre 

 of the zone, with l'>iaiini/(iii//)h(>i((, for which reason it is imjiossible to decide whether detaclied 

 valves belong to one or other of the subgenera. 



Artificial kei/. 



I StiiiP (111 tlic dorsal side furcate A. sperlahilis (ijiEG. 



■ \ — — — not — 2. 



( Valve reniforra A. obesa Cl. a. Grove. 



■ 1 ~ linear 3. 



., J Valve about 20 times longer than broad A. injlcxa Breb. 



I — Gto7 — — — — A. ohtusa Greg. 



1. A. inflexa Bri^b. (1849). — Frustnle linear, elongated, with truncate ends. Connecting 

 zone with close and fine divisions. V. arcuate, linear, with rounded ends. L. 0,13; B. 0,oo7 mm. 

 Median line more approximate to the dorsal than to the ventral margin. Central nodule elongated. 

 No areas. Striaj 20 in U,ui mm. parallel, convergent at the ends, where they are closer, very 

 finely punctate. — Amphipleura inflexa Breb., KtJTZ Sp. Alg. p. 88. Amphora inflexa, H. L. Sm. 

 Lens II p. 78 PI. II f. 16 (1873). Okedcnia inflexa Eulenst. Ms. Cl. M. D. N:o 192 (1879). 

 V. H. T. N:o 1(^7. 



Marine (pelagic): Firth of Tay! Adriatic! 



The fig. in The Lens does not give any idea of the appearance of this isolated and strange 

 form. The cc^mplex nature of the zone is very difficult to discover, and 1 am indebted to Prof. 

 Van Heurck for photographs of specimens, mounted in realgar, which shew it pretty well. 



2. A. obtlisa Greg. (1857). — Frustule in outline elliptic-rectangular, somewhat more than 

 twice as long as broad. V. linear, obliquely rounded. L. (),()6.'j to 0,2g; B. 0,oi to 0,o3:) mm. 

 Median line not dilated to a stauros. Strisp 11 to 20 in 0,oi mm. 



Forma tupica Cl. — L. of valve 0,o75 to 0,14; B. 0,035 to 0,0.1 mm. Dorsal and ventral 

 stri;e 18 to 20 in 0,01 mm., composed of puncta, 15 to 24 in 0,oi mm. — A. ohtusa Greg. T. M. 

 S. V p. 72 PI. I f. 34. A. S. Atl. XL f. 4 to 7, 11 to 13. Amphiprora maxima Rab. Jan. 

 Honduras D. p. 3 PI. II f. 4 (1862). Toxonidea Icevis Witt J. Mus. GodefF. p. 70 PL VIII f. 9 

 (1873). Ampliora permagna Pant. II p. 38 PI. VI f. 113 (1889). 



Marine: North Sea! Mediterranean Sea! Adriatic! Black Sea! Red Sea! Seyclielles! Mada- 

 gascar! Labuan! Celebes! China! Cape May! North Carolina! West Indies! Campeachy Bay! Mexico! 

 Porto Seguro! Fossil: Hungary, Czekehaza! Oamaru (Strite 17 to 18 in O.oi mm.). 



Forma minuta Cl. — Frustule 0,o63 in length and in breadth 0,03. B. of the valve 0,o3 

 mm. Strire 25 in 0,oi mm.; puncta about 21 in 0,oi mm. 



Marine: Macassar Straits! 



Var. occanica Castr. (1886). — V. in L. 0,i3 to 0,26; in B. 0,028 to 0,035 mm. Stria' 15 

 in 0,01 mm., composed of puncta, about 15 in 0,oi mm., which form undulating, longitudinal rows. 

 — A. occanica Castr. Challenger Exp. D. p. 20 PI. XXVII f. 20. A. fallax Temp, et Brun D. 

 du Japon p. 14 PI. VII f. 13 (1889). A. cijelops Leud. Fortm. D. de Ceylon PI. VIII f. 82 (1879)? 



Marine: Gulf of Naples (l>eby Coll.)! Ceylon (Le Tourneur Coll.)! Sumatra (V. H. Coll.)! 

 China (Deby Coll.)! Sydney (Castr.), Japan, fossil (Temp. a. Brun). 



Var. Lunyacsekii Pant. (1889). — L. 0,129; B. 0,028 mm. Stri;e 9 to 9,.'j in O.oi mm. — 

 A. Lun. Pant. II p. 38; III PL XXXV f. 498. 



Marine: Hungary, fossil (Pant.). 



Var. trans fuga Cl. — V. in L. 0,i8 and B. 0,0 2 3 mm. Strite 11 to 12 in 0,oi mm.; puncta 

 19 in 0,01 mm. — Amphora ohtusa A. S. Atl. XL f. Iti, 17? 



Marine: Madagascar! Macassar Straits! 



