Prof. W. Smith on the Diatomacese of the Pyrenees. 7 



3. Species or Varieties not described or figured in the ' Synopsis* 



Epithemia Eugeniae, n. sp. Synedra fontinalisj n. sp. 



Amphora marina, n. sp. Odontidium hyemale, var. /3, W. Sm. 



Tryblionella gracilis, var. /3. hyemale, var. y, W, Sm. 



Navicula scita, n. sp. informe, n. sp. 



Pyrenaica, n. sp. Diatoma Ehrenbergii, Kutz. 



dissimilis, n. sp. Himantidium marinum, n. sp. 



Cocconema lanceolatura, var. /3, Melosira cribrosa, Breb. 

 W. Sm. Diadesmis Gallica, n. sp. 

 lanceolatura, var. y, W. Sm. Gomphogramma rupestre, Braun. 



I add descriptions and figures of the forms contained in the 

 last list. 



Epithemia Eugenia, n. sp. F. V. inflated, with truncated extre- 

 mities ; S. V. lunate, extremities straight, truncate ; cana- 

 liculi distinct, 8 in '001"; foramina conspicuous. Strise 

 33 in -001". Length -0009" to -0033". v.v. 



Fresh water. Face of the cliff below the "Villa Eugenie'* at 

 Biarritz. 



The nearest allies of this beautiful little species are E. pro- 

 boscidea and E. Sorew. It may however be easily distinguished 

 from the first by the much slighter inflation of its F. V. and its 

 distinct foramina, from the second by its conspicuous canaliculi 

 and their areola-like interspaces, and from both by the regular 

 outline of its dorsal margin, and the absence of any recurvature 

 at the extremities of the valve. 



Plate I. fig. 1. Epithemia Eugenia : a & 5, S. V. of frustule; c, F. V. of 

 ditto ; d, F. V. of frustule undergoing self-division. 



Amphora marina, n. sp. F. V. elliptical with somewhat truncate 



extremities ; nodule very faint. Strise 40 in •001'^ Length 



•0006" to -0024". v.v. 



Marine. French coast near Havre (June), and Biarritz (July 1856). 



This form is not unfrequent on the British coast, but has 



hitherto been overlooked from its exact resemblance in outline 



to A. affinis', it may be known by its more delicate strise and 



inconspicuous nodules. 



Plate I. fig. 2. Front views of Amphora marina. 



Tryblionella gracilis, W. Sm. Synopsis of the British Diato- 

 macese, p. 35. 



Var. p. S. V. elliptical with subacute extremities. Strise 12 

 to 16 in -001". Length -0009". Breadth -0006". v.v. 



Fresh water. Spring near the Salut Source at Bagneres de 

 Bigorre. 



