192 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



linear, central axial area, on one side of wliich, in the middle of the valve, there is a liorseshoe- 

 shaped area. Strititi 18 in 0,oi mm. almost parallel, coarsely pnnctate. Lower V. with narrow^ 

 axial area and broad, qxiadrate or rectangular central area. Strife 14 in 0,oi mm., slightly radiate, 

 coarsely punctate. — Acltnanthidimn Janccolaftin/ Kuxz. Sp. Alg. p. M. W. Sm. B. D. II PI. XXXVII 

 f. 304. Achnanihes lane. Gkun. A. D. p. 23. V. H. Syn. p. 13J PI. XXVII f. 8 to 11. Stauro- 

 neis trnncata Schum. Prenss. D. 1 Nachtr. p. 22 f. 28. 



Fresh water: Throughout Europe! Amsterdam Island! Tasmania! New Zealand! Australia 

 (North Australia, Daintree River, Australian Alps)! Illiuois! Ecuador! 



Var. iluhia CIrun. (1880). — Broadly lanceolate. L. O,oir) to 0,oi7; B. 0,o(i7 to O.oora niui. 

 Striie 13 to 14 in 0,0 1 mm. — A. D. p. 23. V. H. Syn. p. 132 PL XXVII f. 12, 13. 



Fresh water: Belgium (V. H.), Austria (Grnn.)! 



Var. eUipfica Cl. (1891). — Elliptical. L. 0,oi2 to 0,oic, ; B. 0,007 to 0,()o<t mm. Upper V. 

 with 16 striae in 0,oi mm. — D. of Finland p. 51 PI. Ill f. 10, 11. 



Fresh water: Abo in Finland! 



Var. Haynahlii Saarsch. (1881). — Inflated in the middle, with rostrate-capitate ends. L. 

 0,02.5 to 0,027; B. 0,007 mm. Striif 1(5 in 0,oi mm., indistinctly punctate. — Aehn. llaynnldii Saarsch. 

 Spec. Phyc. Aequat. p. 8 (according to Do Toni Syll. p. 478). Cl. Diatomiste II PL VII f. 14. 



Frescli water: Ecuador, Antisana! 



3. A. Perag'alli Brun. a. H^rib. (1893). — Broadly elliptical, inflated, with protracted api- 

 culate or subcapitate ends. L. 0,oi2 to 0,oi6; B. O,oofi to 0,oo8 mm. Upper V. with narrow, 

 linear and central axial area, on one side of which in the middle of the valve there is a horseshoe- 

 shaped area. Strite 17 in 0,oi mm. slightly radiate. Lower V. with large, outward dilated central 

 area. Strife very fine and oblique. — D. d'Auvergne p. 50 PL I f. 4. 



Fresh water: Puy de Dome, living (Brun. Coll.)! 



A very small, but distinct species, resembling A. Imic. var. Hdyiiahlii. 



4. A. mesogoilgyla Grun. (1879). — Narrow, elongated, inflated in the middle, with rounded 

 ends. L. 0,08 to 0,09; B. 0,oi3 to 0,oi4 mm. Upper V. with central, narrow axial area aiul 

 transverse, coarsely punctate strife, 10 in 0,oi mm. (puncta 18 in 0,oi mm.). Lower V. with broad 

 central fascia. Strife 11 in 0,oi mm. punctate; puncta l-s in (),oi mm. — Cl. M. 1). N:o 193. 

 A. D. p. 19. Icon. nost. PL III f. 2. 



Fresh water: Brazil! 



5. A. coarctata Brii;b. (1855). — Linear, slightly con.stricted in the middle, with broad, 

 truncate ends. L. 0,04; B. 0,008 mm. Upper V. with very excentric, narrow, frequently infra- 

 marginal, axial area. Strife 11 to 14 in 0,oi mm. punctate. Lower V. with broad central fascia. 

 Striee 12 to 15 in 0,oi mm. slightly radiate, pnnctate. — Achnaniliidium coarrf. Ann. Mag. Nat. 

 Hist. [2] Vol. XV p. 8 f. 10. W. Sm. B. D. PL LXI f. 379. Achumthes coarrf Grun. A. J). 

 p. 20. V. H. Syn. p. 130 PL XXVI f. 17 to 20. Achnonihidium coarrf. rar. rJiurafa Lagst. 

 Spitsb. I), p. 49 PL I f. 16. Arhv. Unodis Ehb. M. G. PL XXXIV, 5, B, 12. 



Fresh water, moist earth, on mosses: Sj^itsbergen ! Beeren Eiland (Lagst.), Arctic America! 

 Sweden (Upsala)! England! France! Belgium (V. H.). 



6. A. inflata Kutz. (1844). — Elongated, gibbous in the middle, with rounded capitate ends. 

 L. 0,04 5 to 0,005; B. 0,0 15 to 0,0 18 mm. Upper V. with very excentric axial area. Strife 9 to 

 10 in 0.0 1 mm. ])arallel, composed of coarse puncta, about 9 in O.oi mm. Lower V. with broad 

 fascia. Striae about 10 in 0,oi mm. slightly radiate; puncta about 10 in 0,oi mm. — Sfauroneis 

 inflata KCtz. Bac. 105 PL XXX f. 22. Arhnanthes ventricosa Ehb. M. Geol. p. 226. Monogramma 

 ventr. Ehb. M. Geol. PL I, 11. f. 9, PL III f. 18, 19, l>, r. Grev. T. lV)t. Soc. Edinb. Vol. VlII 



