EEPORT ON THE ASTEROIDEA. 247 



the west and extending to Java in the Eastern Archipelago, and 

 thence to the Pacific northward to Japan. Luidia hardwickii is 

 reputed to be from the Indian Ocean, but the exact locality is 

 unknown. 



Eastern Archipelago : Five species between the parallels of 20° N. and 10° S. 



*Luidia longispina and * Luidia aspera, off the Philippine Islands, 



the latter extending to the north of New Guinea. * Luidia forficifer, 



in the Arafura Sea. Luidia maculata, off Java, and extending 



into the Indian and Pacific Oceans. Luidia chefuensis, off Singapore. 



Pacific : Eight species between the parallels of 40° N. and 20° S. 



On the western side : *Luidia limbata, Luidia quinaria, and 

 Luidia maculata, off the coast of Japan, the last mentioned extending 

 into the Eastern Archipelago and Indian Ocean. 



On the eastern side : Luidia californica and Luidia foliata, 1 off 

 the coast of California. Luidia brevispina and Luidia columhise, off 

 the coast of Mexico, the former extending to the Sandwich Islands 

 and the latter to Panama. Luidia bellonse, extending from Panama 

 to Peru as far south as Callao. 



The species collected by the Challenger Expedition are indicated in the above list by 

 an asterisk. 



/8. Bathy metrical range : Shallow water to 374 fathoms. 



All the species are found in the Littoral zone, and four only pass into the 

 Continental zone, viz. : Luidia sarsii, Luidia elegans, Luidia convexiuscula, 

 and Luidia barbadensis. None occur in the Abyssal zone. 



Greatest range of one species : Luidia sarsii, shallow water to 374 

 fathoms. 



y. Nature of the Sea-bottom : Generally sandy, or sandy mud ; but unfortunately the 

 definite character of the bottom inhabited by Luidia is recorded in very few 

 cases. Of the forms collected by the Challenger, Luidia aspera and Luidia 

 forficifer were both found on Green mud and Coral mud ; and Luidia longi- 

 spina on mud. 



Luidia elegans and Luidia barbadensis are recorded as frequenting 

 calcareous pebbles, the latter being also found on fine mud. Luidia con- 

 vexiuscula is found on Volcanic sand, madrepore sand and broken shells, 

 as well as on a hard bottom. Luidia sarsii is found on sand and coarse 

 shell-sand. 



1 I am in great doubt as to whether this form can really be distinguished from Luidia brevispina. 



