450 



new species, in addition to the new Amphorae of the Glenshira sand, 

 which, as already stated, also occur in these materials. I have 

 found it necessary to divide them into two series, the simple and the 

 complex. 



A. — Simple Amphorm. 



I exhibit enlarged figures of one or two from each division. 



The first three species in the list of complex Amphorae have been 

 already figured from the Glenshira sand, but imperfectly, and in one 

 case erroneously ; I therefore figure them again, as they are now 

 better understood. This complex group, of which a short time since 

 only one was known, namely, — A. costata, Sm., has now become a 

 very large one, and the remarkable structure of the forms included 

 in it, which had hardly been attended to in ^. costata, is found to be 

 of very frequent occurrence. It is probable that these complex forms 

 will require the establishment of a new genus ; but in the meantime 

 I regard them as forming a well-marked sub-genus. 



There are still several species of Amphora3 to be added to the long 

 list ali'eady given ; but they have not yet been fully studied, for want 

 of time. 



Group VII. 



3Iiscellaneous. 

 A few forms are here added, which do not enter into the groups 

 already named, or were observed too late. 



99. Navicula ? Libellus, n. sp. 



100. Nitzschia ? panduriformis, n. sp. 



101. Nitzschia distans, n. sp. 



102. „ hyalnia, n. sp. 



103. ricurosigraa reversum, n. .«p. 



104. Sceptroneis Cadueeus, Ehr. 



105. Synedra undulata, Greg. 

 ^To.Karium undulatum, Bail. 



106. Synedra llennedyana, n. sp. 



