146 P. T. CWOVE, SYNOPSIS OF TIIE NAVICUT.Oin DIATOMS. 



0,0 1 mm. almost parallel. — Ralfs Prich. Inf. p. 913. <SY. AnijMoxys Greg. T. M. S. IV p. 48 

 Pl. V f. 23 (1856). St. Grcgorii Grun. A. D. p. 47 Pl. III f. fM (1880). V. H. Syn. p. 68 Suppl. 

 Pl. A. f. 4. 



Brackisli water: Sea of Kära! North Sea (coasts of Sweden! ScotlandI and Belgium V. H.). 

 Black Sea (Sebastopol)! Caspian Sea (? Grun.), Atlantic coast of N. N. America (Cape May) I 



S. Gregorii ditfers from S. salina by its broad staiiros. Probably a variety vith more 

 lanceolate outline is S. paciflca Castr. (Chall. Voy. p. 23 Pl. XX f. 9), which is too insufficiently 

 described for identification. 



A small form of »S'. Gregorii from tlie moutli of the Somme lias Ijeen named hy Gruxow 

 (in Cl. M. D. 247, 255) var. diminufa. 



7. S. perniinuta Grun. (1881). — V. elliptical, witli rounded ends. L. O.oi.'? to 0,025; 

 B. 0,oofj to 0,007 mm. Stanros narrow, pervious. Stripe 22 to 23 in O.oi mm. sliglitly radiate. — 

 Grun. in Cl. D. fr. Grönl. Arg. p. 12 Pl. XVI f. 9. 



Brackish water: South Africa (Grun.), Patagonia (Arroyo de Olivera)! 



8. S. perpuslUa Grun. (1884). — V. lanceolate. L. 0,oi8 to 0,02; B. O.ooss mm. Stauros 

 narrow, pervious. Strife not seen. — Grun. Franz Josephs Land D. p. 105 (53) Pl. I f. 50. 



Marine: Franz Josephs Land (Grun.). 



Var. obtusiusciila Grun. — V. shorter, with more obtuse ends. Grun. 1. c. f. 49. 



Marine: Franz Josephs Land (Grun.). 



9. S. (lesiderata Cl. (1880). — V. linear to lanceolate with broad, capitate ends. L. 0,0.5; 

 B. 0,0 IB mm. Terminal fissures of the median line hook-shaped and turned in contrary directions. 

 Stauros narrow, linear, reaching nearly to the margins. StrifB 14 to 19 in 0, 01 mm. slightly 

 radiate, especially at the ends, very finely punctate. — Cl. in A. D. p. 14 Pl. III f. 58. 



Brackish and marine: Sea of Kära! Behrings Island! 



10. S. septeiitrionalis Grun. (1884). — V. linear-lanceolate. L. 0,024; B. 0,oo4S mm. 

 Stauros narrow, not reaching the margin. Striee 23 in 0, 01 mm. transverse, in the middle sub- 

 radiate. Grun. Franz Joseps Land D. p. 105 (53) Pl. I f. 48. 



Marine: Franz Josephs Land (Grun.). 



11. S. kryopliila Grun. (1884). — V. elliptic-lanceolate. with obtuse ends. L. 0,019; 

 B. 0,00 7 mm. Stauros narrower towards the margins. Stria' in the middle 16, at tlie ends 20 in 

 0,0 1 mm. slightly radiate, distinctly punctate. — Grun. Franz Josephs Land D. p. 105 (53) Pl. I f. 47. 



Marine: Franz Josephs Land (Grun.). 



12. S. pacliyccpliala Ch. (1879). — V. linear, gibljous in the middle, with broad, capitate 

 ends. L. 0, 04 to 0, 055; B. 0, 007 to 0, 009 mm. Median line wiih' contrary and hook-shaped termi- 

 nal fissures. Stauros pervious. Striaä about 29 in 0,o 1 mm. radiate. — Cl. M. D. N:o 197. X. R. 

 D. p. 15 Pl. III f. 43. 



Brackish water: South Africa! Tasmania! 



13. S. Schiuzii Brun. (1891). — V. linear, somewhat gibbous in the middle and at the 

 broad, rounded ends. L. 0, 13 to 0,17; B. 0,oii to 0, 12 mm. Stauros pervious. Terminal fissures 

 turned in the same direction. Terminal nodules large. Axial area narrow, linear. Strife 19 to 

 20 in 0,01 mm. slightly divergent in the middle and sliglitly convergent at the ends, distinctly 

 punctate. Puncta 19 to 20 in 0, 01 mm. arranged in irregnlar, longitndinal rows. — Brun. 

 D. espéces n. p. 38 Pl. XVI f. 1. 



Fresh water: South West Africa (Brun Coll.)! 



This form is very distinct from all other known species. The narrow axial area is bordered 

 by conspicuous, thick silicious ribs. 



