412 THE VOYAGE OF H.M.S. CHALLENGER. 



genus conceived by Miiller and Troschel, and there is consequently no excuse on the 

 ground of long established usage to set against the duty of restoring Gray's name of 

 Nardoa. It is a simple act of justice, which cannot in honesty be passed over, as well as 

 a means of keeping before naturalists the name of one whose work is worthy of remem- 

 brance. The use of the name in 1862 for a genus of Protozoa is no valid reason in my 

 opinion against restoring Nardoa to its original signification. 



Chorology of the Genus Nardoa. 

 a. Geographical distribution : — 



Indian Ocean : Four species between the parallels of 30° N. and 30° S. 



Nardoa variolata and Nardoa segyptiaca, from the Eed Sea and 

 Mauritius, the former also from Mozambique, Eodriguez, and Ceylon, 

 and the latter extending into the Pacific. Nardoa galathese, from 

 the Nicobar Islands, and extending into the Eastern Archipelago. 

 Nardoa novce-caledonice, from Ceylon (Jide Bell), and extending 

 into the Pacific. 



Eastern Archipelago : Five species between the paraUels of 20° N. and 20° S. 

 Nardoa galathese, from Togean Island, and extending into the 

 Indian Ocean. Nardoa pauciforis, from Flores. Nardoa tuber- 

 culata and Nardoa obtusa, from the Philippine Islands. Nardoa 

 serniregidaris, from Java, and extending into the Pacific. 



Pacific : Five species between the parallels of 40° N. and 30° S. 



Nardoa segyptiaca, from the Samoa Islands (also from the Fiji 

 Islands and Sandwich Islands, fide Perrier), and extending into the 

 Indian Ocean. Nardoa novse-caledonise and Nardoa gomophia, 

 from New Caledonia, the former also from Ceylon {fide Bell). 

 Nardoa serniregidaris, from Japan, and extending into the Eastern 

 Archipelago. Nardoa semiseriata, off the southern coast of China. 



/3. Bath y metrical range: All the species are confined to shallow water. Nardoa 

 semiseriata in 40 fathoms. 



y. Nature of the Sea-bottom : Eecorded in few instances. Nardoa tuberculata on 

 coral reefs. 



Chorological Synopsis of the Species herein mentioned. 



