244 Transactions of the Boijal Microscoj>ical SocieUj. 
being straight as in G. marina. I have been unable to obtain a 
s. V. of the diatom. I, however, believe them to be arcuate. 
Ehabdonema. 
18. B. hamuliferum (F. Kitton). Yalves lanceolate, un- 
dulate, with transverse punctate striae, ends rounded smooth, dia- 
phragms * striate their whole length, having in their centre a circular 
ring, and towards the extremities two others much smaller and 
elliptical. Seen in f. v. the frustules appear composed of a variable 
number of diaphragms (annuli) placed between the two valves, and 
separated the one from the other by lines in the form of hooks ; 
each of the diaphragms is striated on the edge. Length 33 to 
78 ya, breadth 11 to 15//,. 
On corallines, Lyell’s Bay. PI. XY., Fig. 22. 
This form is distinguishable from all other species of Ehab- 
donema by the undulations of the margin of the valves, and by the 
lines separating the diaphragms being bent in the form of hooks. 
Mr. Kitton recognized it as new, and named it hamuliferum. 
Auliscus, Ehr. 
19. A. stelliger (P. Petit). Yalves circular, with four pro- 
cesses, two of which are very small. The valve is divided into 
three concentric parts, the innermost has five stellate rays, the 
intermediate portion has the rays irregularly disposed, the external 
circle has a row of puncta on the inner margin corresponding 
with the rays of the intermediate part ; in this outer ring are 
situated the four processes, between which are irregular rays. 
Diameter 35 /r 2. 
Campbell Island (rare). PI. XY., Fig. 25. 
This species is distinguished from all other Aulisci, recent or 
fossil, by the peculiarity of the disk and by the presence of the 
interrupted rays. 
The following genera and species of other authors are figured 
by M. Petit : — 
1. Coeconeis Wrightii (O’Meara), ^Q. M. J.,’ vol. vii. n. ser. 
V. 246, pi. vii. fig. 6. 
Lyell’s Bay. PI. XIY., Fig. 3. 
The figure here given represents a very small form, not exceed- 
ing 13 //, to 26 //, 4, but the difference from the type form is too 
little to allow of its being considered a variety ; by altering the 
focus of the objective a dilated cruciform nodule may be detected. 
* The so-called diaphragms as figured by M. Petit are valves ; the diaphragms 
(annuli) in this genus are only striate on the edges. The “ hooks ” represent the 
septa as seen in s. v. 
