74 MESSES. ^Y. WEST AND G. S. WEST ON 



Yar. DENTicuLATTJM, Norclst. Desm. Brasil. in Kjob, Vidensk. Meddel. 1869 (1870), p. 224. 



Torma minor. (PL VIII. figs. 40, 41.) 



Long. 30-31 ix ; lat. 28-29 /n; lat. isthm. 95 /u. 

 Nos. 3 and 36. 



131. Statjrastrum Bieneanum, Babenh. Alg. no.l 410. (S. orbictilare, Ralfs, var. 

 Bienemium, Babenh., PI. Europ. Alg. iii. p. 200.) 



Long. 21 fx ; lat. 23-28 ^ ; lat. isthm. 8*5 /z. 

 No. 3. 



132. Statjrastiitim hypocephalophorum, nov. sp. (PL VIIL fig. 25.) S. parvum, pauUo 

 latins qnam longum, profunde constrictum, sinu aperto ; semicellulse ob triangulares, 

 lateribns et apicibus leve convexis, angnlis subcapitatis, capitibus magnis conico- 

 obtnsis ; a vertice visas triangulares, lateribus levissime convexis, angulis subcapitatis, 

 capitibus magnis conico-obtusis ; membraua delicatissime punctata. 



Long. 23 ^ ; lat. 25 ^ ; lat. istbm. 7'7 fx. 

 No.l. 



133. Statjrastrum pygm^tjm, Breb. in Balfs, Brit. Desmid. p. 213, tab. xxxv. fig. 26 ; 

 Babenb. PL Europ. Algar. iii. p. 220. 



Var. APiCTJLATrM, nov. var. (PL VIII . fig. 26.) Var. minor, semicellulis angulis 

 apiculatis ; a vertice visis lateribus retusis, angulis apiculatis. 

 Long. 21 p. ; lat. 25 n ; lat. istbm. 7 /*. 

 No. 0. 



134. Statjrastrum rugulosum, Breb. in Balfs, Brit. Desm. p. 214, t. xxv. fig. 19. Porma 

 semicellulis apicibus truncatis, a vertice visis lateribus plus concavis. 



Long. 30 ju ; lat. 37 /u ; lat. istlim. 12 /x. 

 No. 0. 



135. Staurastrum glaphyrum, nov. sp. (PL VIIL fig. 27.) >S. parvum, paullo longius 

 quam latum (sine processibus), profunde constrictum ; semicellulse obsemicirculares, 

 apicibus subrectis, angulis in processus glabros leviter divergentes productis, 

 apicibus tridentatis dentibus late divergentibus ; a vertice visse triangulares, lateribus 

 subrectis, angulis in processus glabros tridentatos productis ; membrana glabra. 



Long. 14 ju ; lat. cum proc. 29 n, sine proc. circ. 11 /u ; lat. isthm. 4-4 p. 

 No. 1. 



13G. Staurastrum bibrachiatum, Beinsch, Contrib. iVlg. et Pung. t. xvi. fig. 2. 



Var. cymatium, nov. var. (PL VIIL fig. 28.) Var. cum processibus longioribus bidentatis 

 clare 6-undulatis (utrobique). 

 Long, sine proc. 12 ^u, cum proc. 46 /» ; lat. cum proc. 44-46 fx ; lat. isthm. 4-8-5'5 ^. 

 No. 3. 

 The body of this variety is rather smaller in proportion to the length of the arms than 



