CUTHONELLA. 23 
contain otoconia, not a single otolith. These characters, though occurring in 
Cuthonella abyssicola, for which Bergh created the genus, have not been found united 
in any other form, and Dr. Friele (“ Mollusken der ersten Nordmeerfahrt,” Bergen’s 
Museums, Aarbog, 1902, No. 3, page 9) has enlarged the definition, treating the dorsal 
position of the vent as the chief character, the shape of the foot, denticulation of the 
jaw and presence of otoconia being regarded as of secondary importance. Following 
this example, I refer to Cuthonella, three forms in the present collection, and the genus 
will now comprise the following species :— 
1. Cuthonella abyssicola Bergh. 
. C. ferruginea Friele. 
. C. berghi Friele. 
. C. antaretica, sp. nov. 
. C. modesta, sp. nov. 
6. C. paradoaa, sp. nov. 
The arrangement of the cerata in the last-named species appears to have been very 
remarkable, and might warrant the creation of a new genus, but the specimen is 
unfortunately damaged. 
All from the North Atlantic in considerable 
depths. 
o Bm Co bo 
8. CUTHONELLA ANTARCTICA. 
OnE specimen labelled “W. Q. 5. vi. 02. OD net,” uniform yellowish brown in 
colour and fairly stout. The body is 14 mm. long and 6 mm. broad across the 
pericardium, without the cerata. These latter have an irregular appearance, as they. 
point different ways, but are set in seven rows on each side, containing four to six each. 
Fig. 25.—Cuthonella antarctica—A Tootu Fie. 26.—Cuthonella antarctica—A Tootu 
FROM ABOVE, FROM THE SIDE. 
There are six in the first row. The innermost are the largest (5-6 mm. high), and the 
outermost are very small. After the seven rows comes a clump of very small cerata 
on the tail. The genital orifices lie below and between the first and second rows. 
The vent is latero-dorsal, and lies at the right posterior extremity of the pericardium 
close to the innermost cerata of the fourth and fifth groups. The first is rounded in 
front without a trace of tentacular angles. The mouth, as preserved, is ventral, and 
