BRITISH DIATOMACEjE. 99 



a Navicula, the nodule being almost exactly central. The species has not 

 occurred to any other collector, and may probably be of foreign origin. 



64. Gomphonema capitatum, Ehr. Synop. p. 80. 



Var. j3. Upper portion of valve almost linear, elongated, equal to, or slightly 

 exceeding the lower, v. v. 



Var. y. V. much attenuated towards both extremities, v. v. 



Var./3. W.Sm.Ann.ser. 2. vol. 15. pi. i. 2/3. Var. y. W.Sm. I. c. fig. 2y. Gom- 

 phonema Fusticulus, W. Sm. MSS. Greg. Mic. Journ. vol. hi. p. 37. 



Fresh water. Var. /3. Itford near Lewes, November 1853 ; Grasmere, 

 August 1853, W.Sm. River Spey, July 1854, Dr. Gregory. Var. y. Brae- 

 mar, August 1854, Br. Balfour. (Var. j3. Puy du Cliergue, Auvergne, elev. 

 5576 feet. Var. y. Near Marseilles, May 1854, W. Sm.) 



65. Gomphonema ventricosum, Grey. V. inflated at the centre, 

 linear, and rounded towards the upper, constricted and obtuse 

 towards the lower extremity; striae 30 in -001". Length of F. 

 •0013" to -0018". v.s. 



Greg. Mic. Journ. vol. 4. pi. i. 40. 



Fresh water. River Spey, July 1854, Br. Gregory. 



66. Gomphonema elongatum, W. Sm. V. inflated at centre, with 

 a submedian constriction in both divisions ; the upper extremity 

 capitate, apiculate, or cuneate ; the lower slightly inflated below 

 the constriction and obtuse ; striae 24 in '001". Length of F. 

 •0018" to -0045". v.v. 



W. Sm. Ann. ser. 2. vol. 15. pi. i. 4. G. Brebissoniil Greg. Mic. Journ. vol. 2. 

 pi. iv. 18. 



Fresh water. Near Wisbeach, April 1854, Mr. S. Smith ; Barley Lake, Co. 

 Cork, June 1855, W. Sm. Mull Deposit, Br. Gregory. (Puy du Cliergue, 

 Auvergne, June 1854, W. Sm.) 



67. Gomphonema rostratum, n. sp. Stipes distinct ; V. ovate- 

 elliptical, produced at the upper extremity into a linear, obtuse 

 rostrum ; slightly constricted near the lower extremity ; striae 30 

 in -001". Length of F. -0009" to -0012". Greatest breadth of V. 

 •00025". v.v. 



Fresh water. Barley Lake, Co. Cork, elev. 780 feet, June 1855, W. Sm. 



68. Gomphonema Sarcophagus, Grey. V. linear-ovate, abruptly 



h 2 



