138 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DTATOMS. 



(5 to 8 in 0,01 mm.), coarsely, transversely striate; strife 8 to 9 in 0,oi mm. On both sides of 

 the longitudinal margins is a broad hyaline limbua. V. narrow, linear, with broad capitate ends. 

 Median line slightly biarcuate. Dorsal side with 8 strise in 0,oi mm., coarsely but obscurely 

 punctate. Ventral side without strise, and with a longitudinal line close to the median line. — 

 Diatomiste I p. 159 Pl. XXIIl f. 1, 2. 



Marine: Norway, Grip! Morocco! Balearic Islands! Macassar Straits! Gralapagos Islands! 



The frustule has a considerable resemblance to A. exsecta GtRUN., but the valves ai-e diffe- 

 rent. A. Umpida Jan. (A. S. Atl. XXXIX f. 8) is probably allied with this species, or is perhaps 

 a small variety of it, but the figure it not suiRcient for Identification. 



6. A. sendaiana Brun (1891). — V. linear with obliquely rounded ends. L. 0,19; B. 0,02 

 mm. Median line biarcuate. Central nodule strong, dilated on the dorsal side to a stauros. Dorsal 

 side with 11, finely punctate strise in 0, 01 mm. Ventral side without strise, and with a longitu- 

 dinal line. — D. espéces nov. p. 9 Pl. XII f. 1. 



Marine: Japan, fossil! 



According to Prof. Brun there is a line acrosa the strise, which I have not noted in an 

 original specimen, sent by him. If this line be not the margin of the frustule, and really crosses 

 the stria?, this species may be removed from this group and placed in Diplamphora. 



7. A, Grovei Cl. (1892). — Frustule, of rectangular outline, gibbous on the back. L. 0,105; 

 B. 0,05 mm. Zone with several divisions, transversely striate; striiB 18 in 0, 01 mm. V. linear, 

 with gibbous dorsal margin and broad ends. L. 0, 10 to 0,12; B. 0,oi5 mm. Striae on the dorsal 

 side 10 to 11 in 0, 01 mm., finely punctate. Ventral side not striate and with a longitudinal line. 

 — Diatomiste I p. 158 Pl. XXII f. 16, 17. 



Marine: Seychelles! Java! Sumbava (Kinker Coll.)! China! Macassar Straits! 



8. A. foriiiosa Cl. (1875). — Frustule rectangular with rounded angles. L. 0,14; B. 0,o- 

 mm. Zone with few, broad divisions, about 12 in 0,oi mm., finely transversely striate; strite 8 to 

 9 in 0,01 mm. V. linear with obliquely rounded, spathulate, or clavate ends, according to the 

 position of the valve. L. 0,09 to 0,2; B. 0,025 to 0, 035 mm. Median line biarcuate. Dorsal side 

 with 8 to 9 costate striee in 0, 01 mm., alternating with more or less distinct puncta, 15 to 18 

 in 0,01 mm. Ventral side structureless, with a longitudinal line. — A. S. Atl. XXVIII f. 34, 

 XXXIX f. 2. A. Shtderi Janiscii A. S. Atl. XXXIX f. 1 (1876). 



Marine: Mediterranean Sea (Balearic Islands, Gulf of Naples)! Madagascar (Kinker Coll.)! 

 Ceylon (Colombo, Le Tourneur Coll.)! Sumatra (Deby Coll.)! Singapore! Sumbava (Kinker Coll.)! 

 Macas,sar Straits! Galapagos Islands! Colon (Deby Coll.)! Fossil: S:ta Monica, Calif. 



Var. miniifa Cl. — L. of the frustule O, os 5; B. 0,045 mm. Costse 9 in 0,oi mm. 



Marine: Macassar Straits! Bahia (Deby Coll.)! 



The valves of this very large and beautiful diatom have a very different shape according 

 to the position. A. Fctiti Leud. Fortm. (De de la Malaisie p. 10 Pl. I f. 3) may be a small form 

 of tliis species, which I am unable to decide without original specimens. 



9. A. Scala Cl. and Grove (1892). — Frustule of rectangular outline, with slightly concave 

 sides and rounded ends. L. 0,i4; B. 0,0 5 mm. Zone with broad divisions (about 2 in O.oi mm.) 

 which are transversely costate (costa; about 5,5 in 0,oi mm.). V. in B. 0,oi5 mm. Dorsal side 

 with smooth, costate strise, 5 to 6 in 0,0 1 mm.; intermediate space not distinctly punctate. Ven- 

 tral .side smootli with a strong longitudinal line. — Diatomiste I p. 158 Pl. XXII f. 18, 19. 



Marine: Macassar Straits! Porto Segnro (Deby Co]].)! 



Var. (ilata Cl. — Dor.sal side of tlie valve witli a liyaline limbus. L. of the V. 0,24; 

 B. 0,(1 IS mm. Striie G in 0, 01 mm. 

 Marine: Macassar Straits! 



