180 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOilS. 



f Valve cymbiform G. Cymhella Brus. 



15. ■! — clavate Gr. subdavatum Gbcn. 



\ — lanceolate 16. 



..„ f Striae radiate (r. eriensc Grun. 



— almost transverse G. parvulum KfTZ. 



Astigraatica. 



^ , Axial area naiTow or indistinct 2. 



— — distinct 5. 



„ I Centr 



M' 



'entral area distinct 3. 



- indistinct G. exiguiim Kutz. 



Valve lanceolate G. transsylvanimm Pant. 



, — clavate G. olivaceum Lyngb. 



^ linear-clavate G. peruvianum Gbun. 



linear, with broad apex and basis 4. 



Central area ronnded G. Salinarum Pant. 



— a transverse fascia G. cestuarii Cl. 



^ I Axial area narrow. dilated in tlie niiddle G. kamtschaticiim Gruk. 



' \ — — broad 6. 



{Strise 21 to 22 in 0,0 1 mm (?. ahhreviatum Ktjiz. 

 — 16 to 18 — G. hrasiliense Grdn. 

 — 6 in — — G. Puiggarianum Grun. 



1. (t, eriense Grun. (1878). — V. lanceolate, slightly clavate with. rouiided, obtnse ends. 

 L. 0,032 to 0,042; B. 0,oi3 to 0,014 mm. Axial area narrow, linear; central area small, rounded, 

 with a distinct stigma. Strite radiate, 14 to Ifi in 0,oi mm. — Grun. Casp. Sea Alg. p. 12- 

 V. H. Syn. XXIII f. 10. 



Fresh water: Lake Erie, N. America (Grun.). 



This species in unknown to me, but to judge from the iigure, it is not closelj' allied to any 

 otlier Gomphoneraa. 



2. Gr, parvuliim Ktiiz. (1844). — V. lanceolate-clavate, with rounded or rostrate to capitate 

 apex, gradually tapering from the middle to the narrow often subcapitate basis. Ij. 0,o2 to 0,03; 

 B. 0,oofi to 0,007 mm. Axial area indistinct; central area indistinct or small and unilateral. 

 Stigma frequently indistinct. Strise 13 to 15 in 0,oi mm., almost transverse, indistinctly punctate. 

 — Sphenella purvidum KtJTZ. Bac. p. 83 Pl. XXX f. 63. Gom2Jhon. parvulum V. H. Syn. p. 125 

 Pl. XXV f. 9. G. parv. var. suhcapitata V. H. Syn. f. 11. G. pari: var. lanceolata V. H. Svn. 

 f. 10. G. Lagenula V. H. Syn. Pl. XXV f. 7, 8. 



Fresh water: Sweden! England! Belgium (V. T.), France! Athens! Italy! Sandwich Islands! 

 Tahiti! New Zealand! New Jersey! Dakota! Jamaica! Brazil! Ecuador! 



Var. suljelliptica Cl. — V. elliptic-lanceolate almost symmetrical, with scarcel}- rostrate 

 apex. L. 0,015; B. 0,oo5 to 0,oo6 mm. Strise 13 to 14 in 0,oi mm. 



Fresh water: Greenland! Falmonth! Tasmania! 



Var. exilis Grun. — V. subclavate, narrow, linear-lanceolate, with rounded, not rostrate 

 apex. L. 0,02 to 0,oori mm. Striee 18 to Ii) in O.oi mm. — Grun. Casp. S. Alg. p. 10. 



Fresh water: Rimforsa in Westergötland, Sweden (Grun. ad. icon. in litt). 



Var. exilissima Grun. V. narrow, lanceolate, subclavate. with slightly rostrate ends. L. 0,02; 

 B. 0,005 mm. — Grun. in V. H. Syn. Pl. XXV f. 12 (V. H. T. 17). 



Fresh water: England! Ecuador! 



Var. micropus Kutz (1844). — V. slightly clavate, lanceolate, with obtnse apex and subacute 

 basis. L. 0,025 to 0,03; B. 0,oo7 to O.oos mm. Striffi 8 to 13 in 0,oi mm. Central area unilateral. 

 narrow. — G. micropus Kutz Bac. p. 84. V. H. Syn. p, 125 Pl. XXIV f. 4ti, XXV f. 4, 5. (i. 



