30 Transactions. — Botany. 



C. jenneri, Ealfs, if the frond ever showed any constriction 

 in the middle ; but I can detect none. 



Long, chord, 78-5/a; lat., 9/x. 



Christchurch ; Otaki ; Kaitoke. 



Closterium deconim, Brebisson, farina gracilior. Plate VI., 

 fig. 58. 



The frond is more slender than the type (as given by 

 Delponte and Wolle), and the outer edge is often slightly 

 depressed towards the middle, giving a wavy appearance to 

 the plant. The dimensions vary a good deal. 



Long., 196-230 /^ ; lat., 13-5-24-5 /x. 



Christchurch ; Kaitoke ; "Wellington ; Otaki. 



* Closterium prcdonguvi, Brebisson. Plate VI., fig. 59. 



The ends are slightly recurved in all the specimens which 

 I have seen. 



Long., 204 fx; lat., 24 /x. 

 Kaitoke. 



'■' Clostermira lineatum, Ehrenberg, var. sandviccnse, Nord- 

 stedt. Plate VI., fig. 60. 



As the striae are very closely set in this plant, and the 

 inner edge frequently a good deal inflated, I attach it to Pro- 

 fessor Nordstedt's form, which he reports from the Sandwich 

 Islands. It is a little smaller, apparently, than that type. 



Long., 460-570 fx ; lat., 30-40 fi. 



Hawke's Bay ; Otaki. 



Closterium (?) or Baphidium (?). Plate VI., fig. 61. 



Frond very long, slender, and acicular ; the ends tapering 

 to very sharp points. Viewed in one direction it is quite 

 straight ; in another the outer edge is slightly convex, the 

 inner almost straight for two-thirds of its length from the 

 middle, then slightly bent. Endochrome extending only to 

 the bend of the inner edge, the rest to the ends translucent ; 

 vesicles in a single row ; at the middle there is a minute clear 

 space which can be seen to extend across the whole width. 

 Cytioderm not striated. Near the ends are vacuoles with 

 ■" dancing " granules. 



Long., 350-380 /x; lat., 10 /x. 



Wellington. 



INDEX TO PLATES I.-VI. 



[Note. — Excepting where otherwise mentioned, all the forms in this 

 list are magnified 700 diameters.] 



Plate I. 

 Fig. 1. Sphcprozosma coviprcssum. n. sp. 

 Fig. 2. S. pulchelluvi, Archer. 

 Pig. 3. S. formosum, n. sp. 



