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



I Valve cymbiform G. Cynibella Brun. 

 — clavate G. snbclavatnm Geun. 

 — lanceolate " IG. 



^ ) Striae radiate G. eriensc Grun. 



) — almost transverse G. parvulum KtJTZ. 



A s t i g ra a t i c a. 

 Axial area narrow or indistinct 2. 



j Axi! 



■'■{ 



' ^ — — distinct 5 



Central area distinct 3. 



— — indistinct G. exiguum KtJTz. 



Valve lanceolate G. iranssylvanicum Pant. 



— clavate G. olivacentn Lyngb. 



3 



\ — linear-clavate G. peruvianum Grun. 



I — linear, with broad apex and basis 4. 



, J Central area rounded G. Salinarum Pant. 



' \ — — a transverse fascia G. cestuarii Cl. 



- J Axial area narrow, dilated in the middle G. kamtscliatimin Grun. 



I — — broad 6. 



IStrise 21 to 22 in U,oi mm G. abbreviafuni KtJTZ. 

 — l(i to lis — G. brasiliense Grun. 

 — 6 in — — G. Puiggariannni Grun. 



1. CJ. eriense Grun. (187S). — V. lanceolate, slightly clavate with rounded, obtuse ends. 

 L. 0,032 to 0,04 2; B. 0.O13 to 0,0 14 mm. Axial area narrow, linear; central area small, rounded, 

 with a distinct stigma. Strise 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 itnknown to me, but to judge from the figure, it is not closely allied to any 

 other Gomphonema. 



2. (f. parvulum Kutz. (1844). - V. lanceolate-clavate, with rounded or rostrate to capitate 

 apex, gradually tapering from the middle to the narrow often subcapitate basis. L. 0,02 to 0,o3; 

 B. 0,006 to 0,00 7 mm. Axial area indistinct; central area indistinct or small and unilateral. 

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

 — Sphenella purviihim KtJTZ. Bac. p. 83 PI. XXX f. 63. Gonqihon. parvulum V. H. Syn. p. 125 

 PI. XXV f. 9. G. parv. var. suhcapitata V. H. Syn. f. 11. (J. parv. var. lanceolafa V. H. Syn. 

 f. 10. G. Lagenula V. H. Syn. PI. 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. subelliptica Cl. — V. elliptic-lanceolate almost symmetrical, with scarcely rostrate 

 apex. .L. 0,015; B. 0,oo.') to 0,oo6 mm. Strite 13 to 14 in 0,oi mm. 



Fresh water: Greenland! Falmouth! Tasmania! 



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

 apex. L. 0,02 to 0,oo5 mm. Strife 18 to 11) in 0,(ii mm. — Grun. Casp. S. Alg. p. 10. 



Fre.sh water: Rimforsa in We.stergotland, Swedeii (Grun. ad. icon, in lift). 



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

 B. 0,00.^ mm. — Grun. in V. H. Syn. PI. XXV f. 12 (V. H. T. 17). 



Fresh water: England! Ecuador! 



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

 basis. L. 0,02.5 to 0,03; B. 0,oo7 to 0,oo8 mm. Stria^ 8 to 13 in 0,oi mm. Central area unilateral, 

 narrow. — G. micropm KiJTZ Bac. p. 84. V. H. Syn. p. 125 PI. XXIV f. 4G, XXV f. 4, 5, (>. 



