512 CLEVE, DIATOMS. 



P. elongatum var. fallax Grun. (Arct. Diat. pag. 50, PI. Ill, 

 fig. 36). Transverse striae 22, oblique 20 in 0,oi mm. 



P. strigosum W. Sm. var. convexum Grun. (Arct. Diat. pag. 

 50). Transv. strise 20 oblique 18 in 0,oi mm. 



AmpMprora (Plogioirapis) elegans W. Sm. (Van Heurck 

 Syn. PI. XXII, fig. 1—2). 



A. Lepidoptera Greg. 



Amphiprora rimosa O'Meara (M. J. XI, pag. 22, PI. Ill, fig. 

 1). This curious form, found by O'Meara in gatherings from 

 Seychells, can scarcely belong to Amphiprora or to any known 

 genus of diatoms. 



Achnanthes danica (Flogel) Grun. (Arct. Diat. pag. 21, Stau- 

 roneis cornuta Leuduger-Fortm. Ceyl. PL III, fig. 36). 



Cocconeis? (Achnanthes?) producta Grun. 



Plagiogramma tesselatum Grev. (M. Journ. VII, pag. 208, PI. 

 X, fig. 7). 



P. nankoorense Grun. (P. constrictum v. nankoorensis Grun. 

 Nov. pag. 95, PI. I A., fig. 8. P. ceylanense Leuduger-Fortm. 

 Ceyl. pag. 52, PI. V, fig. 59). This species cannot be a variety 

 of P. constrictum Grev., which has transverse costse at the ends. 

 It occurs fossil in Nankoori and Monterey deposits, living near 

 Madagascar. Rows of puncta 7 in 0,oi mm. In a sample from 

 Port Jackson I have seen a small variety, only 0,o35 mm. in 

 length and with 12 rows of puncta in 0,oi mm., var. minuta CI. 



Raphoneis? fluminensis Grun. (Van Heurck Syn. PI. XXXVI, 

 fig. 34). 



NitsscMa marina Grun. (Arct. Diat. p. 70). 



N. Grundleri Grun. var. — Frustle slightly constricted in the 

 middle. Length 0,ii. Striae, composed of elongate puncta, 13. 

 in 0,01 mm. Carinal puncta elongate, 3 in 0,oi mm. 



N. distans Greg. var. quarnerensis Grun. (Verb. 1862, pag. 

 580, PI. XVIII, fig. 6. Arct. Diat. pag. 87). 



N. socialis Greg. var. seychellensis Grun, (Arct. Diat. pag. 

 85). Length 0,24 mm. Breadth 0,oo8 mm. Carinal puncta 7, 

 striae 16 in 0,oi mm. 



N. fluminensis Grun. (Verb. 1862, pag. 37, PI. XVIII, fig. 

 35. Arct. Diat. pag 86). 



N. Sigma var. valida CI. & Grun. (Van Heurck Syn. PI. 

 LXV, fig. 5), Puncta 4, str. 21 in 0,oi mm. 



N. Sigma var. subrecta Grun. (Casp. Sea Alg. pag. 22). Ca- 

 rinal puncta 8, striae 30 in 0,oi mm. 



N. Sigma var. Habirshawii Febiger (01. & Moll. Diat. No 

 223) Puncta 6, striae 28 in 0,oi mm. 



