De Lautouk. — On a Diatomaceous Deposit. 309 



Nav. placita, n. sp., Gr. and St. 



Nav. prcBtexta, Ehr. 



Nav. sandriana, Grun. 



Nav. smithii, var. nitescens, Greg. 



Nav. sparsipunctata, n. sp., Gr. and St. 



Nav. spathifera, n. sp., Gr. and St. 



Nav. trilineata, n. sp., Gr. and St. 



Orthonels splendida (Greg.), Grun. 



Paralia sulcata (Elir.), Cleve {Ortliorisa marina, " S.B.D."). 



Plagiogramma {constrictum, var?) nancoorense, Grun. 



Flag, neogradense, Pautocsek. 



Flag, tesselatum, Grev. 



Podosira Jwrmoides (Mont.), Grun. 



Pod. maxima, Kiitz. 



Porodiscus liirsiitus, n. sp., Gr. and St. 



Por. interruptus, n. sp., Gr. and St. 



Pseiuio-rutilaria monile, n. sub-gen., n. sp., Gr. and St. 



Pyxidicula cruciata, Eln-. 



Pyxilla diibia, Grun. 



Pyx. jolinsoniana, Grev. 



Pyx. reticulata, n. sp., Gr. and St. 



Pyx. (?) {Pterotheca, Kitt.) aculeifera, Grun. 



Butilaria epsilon, Grev. 



But. epsilon, var. teiiuis, n. sp., Gr. and St. 



But. lanceolata, n. sp., Gr. and St. 



Biit. radiata, n. sp., Gr. and St. 



Steplianogonia danica (Kitt.), Grun., var. 



Stephanopyxis barbadensis (Grev.), Grun. 



St.ferox (Grev.), Grun. 



St. grunnoxcii, n. sp., Gr. and St. 



St. turris (Grev.), Grun. 



St. turris, var. hrevispina, Grun. 



(And numerous other forms belonging to Stephanopyxis.) 

 Stictodesmis australis, Grev. 



Stictodiscus calif ornicus , Grev., var. areolata, Grun. 

 Stict. californicus, var. nitida, n. var., Gr. and St. 

 Stict. hardmanianus, Grev., var. megapora, n. var., Gr. and St. 

 Stoschia (?) punctata, n. sp., Gr. and St. 

 Synedra crystcdlina (Ag.), Kiitz. 

 Terpsinoe americana, Bail. 



Terpsinoe americana. Bail., forma trigona, Pautoc. 

 Triceratium aviericanum, Ealfs. 

 T. aviericanum, var. quadrata, n. var., Gr. and St. 

 T. arcticum. Bright. 

 T. arcticum, var. permagnum, Janisch. 

 T. arcticxLm, Brightw., forma quinquelobaia. 

 T. ausliscoides, n. sp., Gr. and St. 

 T. barbadense, Grev. 



