CUTHONELLA. 



23 



All from the North Atlantic in considerable 

 depths. 



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. 



2. C. ferruginea Friele. 



3. C. berghi Friele. 



4. C. antarctica, sp. nov. 



5. C. modesta, sp. nov. 



6. C. paradoxa, 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. 



8. CUTHONELLA ANTARCTICA. 



ONE specimen labelled " W. Q. 5. vi. 02. D 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. GiMwnella antarctica A TOOTH 



FKOM ABOVE. 



FIG. 26. Cuthonella antarctica A TOOTH 



FBOM 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 



