situation of the immovable eye-stalks beneath and parallel with the anterior border of the 

 carapace, is represented by 4 species. Will. leptodactyla (Will.-Suhm), the first discovered 

 species, does not only occur in the Atlantic, north and south of the Equator, but has also been 

 observed off the west coast of South America. The Gulf of Panama is inhabited by Will. 

 inornata Fax., vvhich may easily be recognized by the few spines on the margin and dorsal 

 ridges of the carapace, while Will. forceps A. M.-Edw., the carapace of which is more inflated, 

 has been obtained by the "Blake" Expedition in the Gulf of Mexico. The fourth species, 

 fïnally, is Will. indica Alcock from the Bay of Bengal. 



The recent Eryonidae are represented by about 45 species and 3 varieties, that are 

 enumerated in the following List, which indicates also the localities where the species have been 

 observed and the depths at which they have been obtained. The greatest depth at which a 

 species of this family was taken, was 2225 fathoms off the coast of South America, where- 

 from Will. leptodactyla has been recorded. 



LIST OF ALL THE SPECIES OF RECENT ERYONIDAE, KNOWN 

 AT PRESENT, November 191 5 \ 



I. Genus Stereomastis Sp. Bate 1888. 



SPECIES 



*sculpta (S. I. Smith) 1880 



HABITAT 



DEPTH IN FATHOMS 



'" andavianensis (Alcock) 1894 



auriculata (Sp. Bate) 1878 . 

 cerata (Alcock) 1894 . . . . 

 Grimaldii (Bouv.) 1905 . . . 



Heller i (Sp. Bate) 1878. . . 



nana (S. I. Smith) 1884. . . 



*p]iosplwrus (Alcock) 1894. . 



Travancore coast 



Bali Sea 



Flores Sea 



Strait of Makassar 



Channel between Makjan and Halmaheira 



Fiji Islands 



Andaman Sea 



Coast of Senegal 



Off south-west coast of Ireland 



Off the Kermadec Islands 2 ) 



North of New Guinea 



East coast of the United States 



Gulf of Panama 



Andaman Sea 



Bay of Bengal 



Arabian Sea 



Gulf of Manar 



East of Rotti 



Hawaiian Islands 



East coast of the United States 



West-Indies 



Eastern Atlantic 



West coast of Ireland 



1043 

 380 

 1093 



395 

 258 

 610 

 922 



982 



520 



1070 

 843—1917 

 899—1322 



200 — 740 



284 



55—809 



250 — 843 



611 — 1568 



610 — 982 



1) The species collected by the "Siboga" are marked with an asterisk and the new species are printed in a more heavy type. 



2) The female, collected by the Challenger Expedition at this Statioo, belongs probably to another species. 



