244 Baeillarieae, Naviculaceae, Pleurosigma. 



Hab. in aquis marinis ad oras Angliae (W. Smith), Belgii (Van 

 Heurck), Hispanise (Truan) ; ad Caput Bonae Spei AfricEe (Gru- 

 now); ad insulam «Tahiti» (Grunow); ad insulas Borneum et 

 Ceylonam (Cleve); fossile in calcaria Japonise (Tempere, Brun) ; 

 — Var. dalmaticum Grun. in Cl. et Gr. 1. c, Perag. Pleuros. t. 2, 

 f. 6-9: Valvis tenuius sigmoideis, 250-320^30, acute elongato-lan- 

 ceolatis, rhaphe minus excentrica; striis transversis 15-19, obliquis 

 12-14 in 10 u. Ad oras daimaticas. — Var. ?americanum Perag. 

 Pleuros. t. 1, f. 9: valvis quam in typo majoribus, delicatis, rhaphe 

 minus excentrica; striis ut in typo. In America fcederata boreali. 



42. Pleurosigma pulchrum Grun. in Wien. Verhandl. 1860, pag. 556, 1042 

 tab. 4, fig. 2, Cl. et Gr. Arct. Diat. pag. 48, H. L. Sm. Sp. T. 



n. 695, Perag. Pleuros. tab. 1, fig. 8, Pleurosigma mirabile 

 O' Meara in Micr. Journ. 1872, pag. 198? — Valvis lineari- 

 lanceolatis, 260 s 20-22, paullo sigmoideo-incurvis, obtuse rotun- 

 datis, rhaphe eximie sigmoidea, ad apices valde excentrica h. e. 

 apices versus uno alteroque margini valvae magis approximata, no- 

 dulo centrali mediocri, suborbiculari ; striis obliquis 11-12 in 10 

 /*., striis transversis multo tenuioribus 17-19 in 10 ^. 



Hab. inter Algas e mari Rubro provenientes (Horvath); ad 

 uColombo» insulae Ceylonse (Leuduger-Fortmorel). 



43. Pleurosigma obscurum W. Sm. Br. Diat. I, p. 65, t. XX, f. 206 1043 

 excl. fig. /3., Heib. Consp. p. 90, n. 3, Sm. Sp. T. n. 407, Rabenh. 



Fl. Eur. Algar. I, p. 233, Perag. Pleuros. t. 1, f. 14. — Parvum, 

 85-150 f/. long., Pleurosigmati pulchro simile, valvis linearibus, 

 media parte rectis, utroque fine sensim attenuatis, apicibus obtuse 

 subconicis, rhaphe valde excentrica, versus polos marginem attin- 

 gente, nodulo centrali parvo rotundato; striis ad 28 in 10 y.. (sec. 

 W. Smith). 



Hab. in aquis submarinis et ad oras Anglise (W. Smith), Hi- 

 bernia?, Daniae (Heiberg), Spetsbergiae (Cleve), Hispaniae (Ra- 

 benhorst); in mari Adriatico (Lorenz), intra Salpam prope por- 

 tum messanensem lectam (Castracane) ; ad uColombo» insulse Cey- 

 lonse (Leuduger-Fortmorel). — Var. ?mediterranea Grun. in 

 Cleve et Gr. Arct. Diat. p. 49, Perag. Pleuros. t. 2, f. 5: valvis 

 anguste lineari-lanceolatis, 210-280 s 18-20, apicibus gradatim at- 

 tenuatis rotundatisque, rhaphe in apicibus valde excentrica; striis 

 obliquis 13i/ 2 -14 in 10 a., transversis 16'/ 2 -18 in 10 p. In mari 

 mediterraneo et ad ins. «Seyschellen». 



44. Pleurosigma longum Cleve Diat. Arct. 1873, pag. 19, t. 3, f. 14, 1044 



