344 
ments, which carry four or generally five pairs of anterior spines 
strongly increasing in size towards the distal end of the segment. 
Jennings (1918) considers Elminius sinuatus as a variety of 
Elminius modestiis Darwin; the present specimens nevertheless 
so closely agree with Hutton’s description and so distinctly differ 
from Darwin’s rather scarce dates of Elminius modestus that it is 
at present the most correct to keep the two species apart. Neither 
have I had any access to indisputable Elminius modestus for com- 
parison. 
Genus Pyrgoma Leach. 
Pyrgoma sp. 
OfTJolo; 12—25 fathoms, 17/III 14. One small specimen on a madre- 
porarian coral together with Balanus allium. 
The specimen seems to be most nearly related to Pyrgoma con - 
jugatum Darwin; but a sure identification of the dried specimen 
is hardly possible. 
A P P E N D I X. 
Scalpellum aff. imbvicatum Hoek. 
East of North Island, New Zealand (Cape Kidnappers, 76—82 fathoms, 
or Cape Runaway, 105 fathoms), The New Zealand Government 
Trawling Expedition. [No date]. One specimen on a spine of an 
Ogmocidaris Benhami Mrtsn. 
The specimen was sent to me by Dr. Mortensen after the 
closure of the special examination of his collections. It is very 
interesting owing to the variations in the lower whorl of plates 
(Fig. 77), although these variations put obstacles in the way of a 
safe identification. The in fr amedian plate of the left side is high, 
rectangular, and siender, that of the right side triangular, short, 
and with a comparatively broad basal margin. The carinal latus 
of the left side is broader and lower than the corresponding plate 
of the right side, and the rostral latus of the left side smaller 
than that of the right side. A rostrum is present, and corresponds 
