202 



Mr. W. West and Dr. G. S. West. 



[Oct. 30, 



ade/ochondmm, Elfv. ; P. Clevei, Lund. ; Tetmcmorus Brebissonii (Menegh.), 

 Ealfs, var. minor De Bary. 



Micrasterias radiata, Hass. ; M. conferta, 'Lund. ; 31. pinnatifida (Klitz.), 

 Ralfs ; M. apieulata (Ehrenb.), Menegh., and var. brachyptera (Lund.), 

 W. and G. S. West. 



Euastrum pictum, Borges. forma ; E. Turneri, West ; E. aboense, Elfv. ; 

 E. inter medium, Cleve; E. pingue, Elfv.; E, validum, W. and G. S. West. 



Docidium undidatum, Bail. ; PI eurotcenium eugeneum (Turn.), W. and 

 G. S. West. 



Cosmarium bipunctatum, Borges. ; C. capitulum, Roy and Biss., var. 

 grcenlandicum, Borges. ; C. Corribense, W. and G. S. West ; C. commissurate, 

 Brelx, var. crassum, Nordst., C. distichuvi, Nordst. ; C. didymoprotupsum , 

 W. and G. S. West ; C. entochondrum, W. and G. S. West ; C. monomazicm, 

 Lund., var. polymazum, Nordst. ; C. obsoletum (Hantzsch), Beinsch ; C. per- 

 foratum, Lund. ; C. pseudexiguum, Bacib. ; C. pseudopyramidatum, Lund., var. 

 sienonotum, Nordst. ; C. quadridentatum, W. and G. S. West ; C. quadrifariuvi, 

 Lund. ; C. retusum (Perty), Babenh. ; C. retusiforme (Wille), Gutw. ; 

 G. Smolandicum, Lund., var. angustatum, West; C. sexnotatum, Gutw., var. 

 tristriatum (Liitkem.), Schniidle ; G. subquadrans, W. and G. S. West : 

 C. subretusiforme, W. and G. S. West ; C. synthlibomenum, West ; C. taxi- 

 chondriforme, Eichl. and Gutw. ; C. tenue, Arch. ; C. tumidum, Lund.,; 

 C. venustum, Breb., var. hypoJiexagonum, West ; C. viride (Corda). Josh. ; 

 C. zonatum, Lund. 



Staurastrum Arctiscon (Ehrenb.), Lund. ; St. aversum , Lund. ; St. bacillarc, 

 Breb. ; St. Brebissonii, Arch. ; St. Brasiliensc, Nordst., var. Lundellii, W. and 

 G. S. West ; St. Cerastes, Lund. ; St. Clevei (Wittr.), Boy and Biss. ; St. con- 

 spicuum, W. and G. S. West ; St. corniculatum, Lund. ; St. curvahon, West ; 

 St. dorsidcntifcriim, W. and G. S. West; St. elongatum, Barker; St. erasum 

 Breb. ; St. forficulatum, Lund. ; St. grande, Bulnh. ; St. Iwvispinum, Biss. ; 

 St. longispinum (Bail.), Arch. ; St. maamense, Arch. ; St. megalonotum, Nordst. ; 

 St. natator, West ; St. Ophiura, Lund. ; St. Pimm, W. and G. S. West ; 

 St. quadrangularc , Breb. ; St. setigeruvi, Cleve ; St. sexangulare (Bulnh.), 

 Babenh. ; St. spiniferum, West ; St. sidigracillimum, W. and G. S. West ; 

 St. cosmospinosum (Borges.), W. and G. S. West ; St. Duacense, W. and 

 G. S. West; St. Hibernicum, West; St. jaculiferum, West ; St. cormdum, Arch. 



In addition to the above, there are a number of species which are 

 extremely rare in a few of the richest localities outside the western areas, 

 whereas in the latter they are generally distributed and many of them 

 prodigiously abundant. Such are : — 



Spirotcenia acuta, Hilse ; Nctrium oblongum (De Bary), Liitkem., var. 



