South of France and the Auvcrtjne, 



Navicula crassinervia, Brib. 



serians, Kutz. 



firma, Kutz. 



gibbcrula, K'litz. 



Stauroneis dilatata, W. Sm. 

 Pinnularia nobilis, Ehr. 



major, W. Sm. 



acuininata, IV. Sm. 



gibba, Ehr. 



divergens, IV. Sm. 



late -striata, Greg. 



hemiptera, Breb. 



nodosa, W. Sm. 



tenuis, Greg. 



Synedra lunaris, Ehr. 



bicc])s, IV. Stn. 



Himantidium Arcus, Ehr. 



gracile, Ehr. 



])cctinale, Kittz. 



Fragilaria virescens, RaJfs. 

 Odontidium hyemale, Kutz. 

 TabcUaria flocculosa, W. Sm. 



fcncstrata, Kulz. 



IMelosira distans, Kutz. 



nivalis, JV. Sm. 



Ortbosira orichalcea, H\ Sm. 

 Collctonenia vulgare, H^^ Sm. 



5. Species or varieties not hitherto figured or described. 



Navicula firma, var. j8, JV. Sm. 

 Gomphoneraa capitatum, var. /3, 

 IV.Sm. 



capitatum, var. y, IV. Sm. 



Brebissonii, Kllfz. 



elongatmn, W. Sm. 



Diatoma vulgai-e, var. /3, W. Sm. 

 grande, IV. Sm. 



Fragilaria undata, W. Sm. 

 Odontidium anomalum, TV. Sm. 

 Achuanthidium lincare, JV. S7/1. 



coarctatum, Breb. 



Amphitetras antediluviaua, var. /3, 



JV. Sm. 

 Ortbosira spinosa, IV. Sm. 



I subjoin a description of the species and varieties included in 

 the last list. 



Navicula firma, var, ^, AV. Sm. Synopsis of Brit. Diatomacere, 

 p. 48. 



Fresh water. Pic du Capucin, Mt. Dore ; elevation -45G5 feet. 



This is probably the normal Nav. firma, Kiitz. Bacill. xxi. 10, 

 and I am disposed to refer Naiu amphigomphus, Kiitz. Bacill. 

 xxviii. 10, to the same species. 



Plate I. fig. 1. Valves of Nav. firma (3. 



Gomphonema capitatum, W. Sm. Syn. Brit. Diat. p. 80. pi, 28. 

 237. 

 Var. /S. Upper portion of frustule almost linear, elongated, 

 equal to, or slightly exceeding the lower. Lens;th of frus- 

 tule -0013" to '^OOiS". v.v. 



Var. 7. Much attenuated towards both the extremities. Length 

 •0012" to -0016". v.v. 



Var. y. G. Fusticulus,'W. Sm. MSS. Greg, in Mic. Journ. vol. iii. 

 p. 39. 



Fresh ivafer. Var. /3. Puy du Cliergue ; elevation 5576 feet. 

 Ilford near Lewes, Nov. 1853, JF. Sm. River Spey, July 1S,5J, 



