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



Subfamily Echinasterin^e, Viguier, 1878. 

 Genus Cribrella (Agassiz), Forbes. 



Pentadactylosaster (pars), Linck, De Stellis marinis, 1733, p. 34. 



Cribrella (pars), Agassiz, M6m. Soc. Sci. Nat. Neuchatel, 1835, t. i. p. 191. 



Linkia, Forbes, Mem. Wern. Soc, 1839, vol. viii. p. 120. 



Henricia, Gray, Ann. and Mag. Nat. Hist., 1840, vol. vi. p. 184. 



Cribella (pars), Forbes, Hist. Brit. Starfishes, 1841, p. 100. 



Echinaster (pars), Muller and Troschel, System der Asteriden, 1842, p. 22. 



For a long time the genus Cribrella was thought to be represented by a single species 

 only, and to be confined to the northern portion of the Atlantic. Within the last twenty 

 years a number of other species have been discovered, and the genus is found to have a 

 wide area of distribution in the Southern as well as in the Northern temperate and sub- 

 frigid zones. In the higher latitudes north of the Equator Cribrella is the only representa- 

 tive of the family, but in its approach towards the southern pole it is accompanied by the 

 allied genus Perknaster. Its bathymetrical range is greater than that of any other genus 

 of Echinasteridse, it being the only representative of the family in the Abyssal zone. 



Chorology of the Genus Cribrella. 

 a. Geographical distribution : — 



Atlantic : Seven species between the parallels of 81° N. and 60° S. 



^Cribrella oculata, off the Scandinavian and British coasts, off 

 Greenland, Labrador, the United States of North America, Spitz- 

 bergen, Nova Zembla, in the White Sea, and off the northern coast 

 of Asia (Brandt). Cribrella antillarum and Cribrella sexradiata, 

 off Barbados, the former also off Guadeloupe, Martinique, and St. 

 Lucia, and the latter off the southern point of Florida. In the 

 extreme South Atlantic : ^Cribrella ornata, from the Cape of Good 

 Hope, and extending into the Pacific. * Cribrella simplex, off the 

 Tristan da Cunha group, and extending into the Southern Ocean. 

 * Cribrella obesa, off the Falkland Islands, and also found in the 

 Strait of Magellan on the Pacific side. Cribrella pagenstecheri, 

 from South Georgia. 



Southern Ocean : Two species between the parallels of 45° and 55° S. 



* Cribrella prsestans, from between Marion Island and Kerguelen 

 Island. * Cribrella simplex, off Prince Edward's Island and Marion 

 Island, and between Marion Island and Kerguelen Island, and 

 extending into the Atlantic. '''Cribrella simplex, var. granulosa, 

 from Kerguelen Island. 



