THE MICROSCOPE IN HISTOLOGY AND BOTANY. 147 



51. Rhipidophora. Fr. as Licmophora, single or in pairs, 

 on a branched stipes ; marine. 



52. Climacosphenia. Fr. cuneate, rounded at broad end, 

 divided into loculi by transverse septae or vittae ; marine. 



COHORT 13. STRIATELLE.E. Fr. tabular or filamentous; 

 vittae straight (not arched). 



53. Striatella. Fr. compound, stalked at one angle; 

 vittae longitudinal and continuous ; v. elliptic-lanceolate, 

 not striated ; marine. 



54. Rhabdonema. Fr. as Striatella, but vittae inter- 

 rupted ; v. with transverse granular striae ; marine. 



55. Tetracydus. Fr. compound, filamentous ; vittae al- 

 ternate, interrupted ; v. inflated at the middle ; striae trans- 

 verse, continuous ; aquatic. 



56. Tabellaria. Fr. united into a filament, subsequently 

 breaking up into a zigzag chain ; vittae interrupted, alter- 

 nate ; v. inflated at middle and ends ; aquatic. 



57. Pleurodesmium. Fr. tabular, united into a filament, 

 and with a transverse median hyaline band ; marine. 



58. Hyatosira. Fr. tabular, fixed by a stalk at one 

 angle ; vittae alternate, interrupted, bifurcate at the end ; 

 marine. 



59. Anaulus. Fr. rectangular, single, compressed, with 

 lateral inflections, giving the valves a ladder-like appear- 

 ance ; marine. 



60. Biblarium. Fr. as Tetracydus, but single ; fossil. 



61. Terpsinoe. Fr. tabular, obsoletely stalked, subse- 

 quently connected by isthmi ; vittae transverse, short, in- 

 terrupted, and capitate ; aquatic and marine. 



62. Stylobiblium. Fr. compound ; v. circular, sculptured 

 with continuous striae ; fossil. 



ft With a Median apparent (pseudo) Nodule. 

 63. Grammatophora. Fr. at first adnate, afterwards 



