REPORT OH THE NTJDIBRAHCHIATA. 
45 
4. Tritonia palmeri, Cooper. 
Pacific Ocean. 
5. Tritonia reticulata , Bergh. 
Japanese Sea. 
6. Tritonia hawaiensis, Pease. 
Pacific Ocean, neighbourhood of Sandwich Islands. 
7. Tritonia pallida, Stimpson. 
Cape of Good Hope. 
8. Tritonia challengeriana , n. sp. 
Pacific off Patagonia. 
9. Tritonia (?) cucullata (Couth.), Gould. 
Western Atlantic off Rio Janeiro. 
Sub-genus 2. Candiella, Gray. 
Margo veli frontalis digitatus. Radula dentibus lateralibus non numerosis. 
The genus contains the following species : — 
1. Candiella plebeia, Johnston. 
Atlantic. 
2. Candiella lineatci, Alder and Hancock. 
Atlantic. 
3. Candiella ( Duvaucelia ) gracilis (Risso). 
Mediterranean. 
4. Candiella manicata (Deshayes) == ? Nemocephala marmorata, A. 
Costa. 
Mediterranean. 
Tritonia challengeriana, n. sp. (PI. XI. figs. 16-19 ; PI. XII. figs. 1-8). 
Habitat . — Southern Pacific. Off the coast of Patagonia. 
Two specimens of this interesting form were dredged at Station 308, off the west 
coast of Patagonia, from a depth of 175 fathoms, on January 5, 1876. Both specimens 
were nearly of the same size, and were well preserved. I dissected both. 
The length of the animal is about 3'5 to 4 cm., the height of the body proper P2-1 '4 
cm., the breadth lfi-l’S cm. ; the breadth of the frontal veil 8-10 mm., the length of 
