F. KITTON ON SOME NEW DIATOMACE.E. 19 



In this variety the " porte-crayon " terminations of the raphe, so 

 conspicuous in Navicula Lewisiana, and more or less so in all the 

 species and varieties of the Vanheurckian group, is more distinct 

 than in the other varieties of Amphipleura. ^ 



Navicula scopulorum, Breb. Forma major. Valve punctato 

 striate, about 65 in -001." Length, -008" to -009" ; breadth at centre, 

 •0006 to -00065. Raphe and nodules somewhat resembling Van- 

 heurckia rhomboides. Rare. 



My friend, Mr. E. Grove, F.R.M.S., of Saltburn-by-the-Sea, has 

 very carefully, examined the Diatomaceous forms obtained from 

 these Oysters, and has kindly permitted me to append his list to 

 my description of the new species. 



M. P. Petit's list, as previously stated, contains the names of 72 

 species. Ours contains more than 100, exclusive of the new forms. 

 Probably several of those named in the list may prove, on further 

 examination, to be new species or new varieties. 



LIST OF MARINE SPECIES OF DIATOMACE^E OBSERVED BY 

 MR. GROVE IN PREPARATIONS FROM JAPAN OYSTERS. 



■£• 



Achnanthes Inngipes, A« 



,, subsessilis, E. 



Actinocyclus Ehrenbergii, Rlfs. Rare. 

 Actinoptychus undulatus, E. 



Amphora marina, W. S. (proteus, Greg.). Scarce. 

 Arachnoidiscus ornatus, E. 



„ Ehrenbergii, Bail. 



Amphiprora ahita, E. var. ?. 



„ elegans, W. S. Scarce. (Qj., A. vitrea.) 

 Asteromphalus Brookei, Bail. Rare. 

 Auliscus ccelatus, Bail. Scarce. 

 „ pruinosus, Bail. Rare. 

 ,, Stockhardtii ? Fragments only. 

 Biddulphia aurita, Breb. 



„ reticulata, Rop. 



Bribissonia Weissflogii, Gran. var. ? (Qj., Schizonema Grevilleii,W. S. 



large form.) 

 Camjjylo discus dcemelianus, Grim. 



„ echene'is, Ebr. Scarce. 



„ undulatus, Grev. Rare. 



„ grceffii, Gren. var., " Atl." xvi., 2. Rare. 



„ biangulatus, Grev. Rare. 



