the Trondhjem Fiord. 355 
This is the smallest form of this very variable species that 
I have, and of peculiar interest as being absolutely identical 
in size, form, and colour with a variety of the allied S. pro- 
pinguus, Alder, found in the Kattegat, and for which I am 
indebted to the ‘Copenhagen Museum. ‘The different character 
of the nucleus alone distinguishes them; and, although the 
use of a lens reveals spiral striz in the latter which are absent 
in the former, such striz are usual in S. gracilis and are even 
to be distinguished on a young specimen of the present form. 
The Kattegat variety of S. propinquus is intermediate in 
size and form between typical S. propinguus and S. Jeffreysi- 
anus, Fisher, which latter I regard as a large variety of the 
former. It is figured (Pl. XVI. figs. 5, 5a) for comparison 
with the dwarf form of S. gracilis, var. glaber. 
29. Buccinum undatum, Linn. 
Specimens procured not representing any special variety. 
30. Nassa reticulata, Linn. 
All the examples of this species which I have dredged on 
the west coast of Norway, in the Hardanger, Bergen, and 
Trondhjem Fiords, and at Flor6é, have a peculiar aspect and 
form a well-marked variety, which I would propose to call 
var. norvegica. The form is shorter and_ proportionately 
broader than usual, so that the outline is more ovate; the ribs 
are about twenty- -five on the body-whorl, very close together, 
and, as the spiral grooves are deeply channelled, the sculpture 
is of a more regular reticulate character than usual ; the colour 
is greenish ashy. Of the twenty-five figures of N. reticulata 
given by Kobelt on plate xxiv. of his Icon. der schalentra- 
genden europ. Meeresconchyl. 1887, fig. 24 comes nearest to 
this form. 
31. Nassa incrassata, Strom. 
Laminarian zone. 
32. Trophon truncatus, Strom. 
One dead specimen, 40 fath., Rédberg. 
33. Trophon clathratus, Linn. 
In 70-300 fath., Rodberg. 
Var. Gunneri, Lovén. 
Two half-grown examples with the last. 
