14 



BULXiETIN 76, UNITED STATES NATIONAL MUSEUM. 



Of the ninety-sLx species and subspecies listed, seventy-three, or over 76 per 

 cent, are confined to tlie North Pacific, although five of these extend to Japan 

 (Table :i) and six others to Mexican waters but not beyond the Trcs Marias and 

 Reviliagigedo islands, leaving 61 i)er cent confined within the geographical limits ot 

 this report. 



Of the remaining twenty-three species, twelve are found in the North Atlantic; 

 and of these twelve, one {Ctenodiscus crispatu^) extends also to Japan and to the 

 South Pacific (Tables 1 and 2), while four others range into Japanese waters. The 

 other eleven species are part of another fauna and their ranges extend southward 

 variously to Panama, the Galapagos Islands, Ecuador, and the extremity of South 

 iVmcrica. If Ctenodiscus crispatus, a very wide ranging form, is omitted it will be 

 seen that eleven of the species are derived from the North Atlantic fauna and 

 eleven others from the South American. 



Of the latter eleven, two species belong to the shallow water Panamic fauna and 

 have pushed northward into southern Cahfornia. They are — 



Astropecten armatus. 



Linckia columbise. 



Considering the seventy-three species which are confined to the North Pacific, 

 only four (Leptychaster projnnquvs, Ilippasteria spinosa kurilensis, H. leiopelta, and 

 //. leiopelta armata) are restricted to the Kamchatkan district, and two of these to 

 the area between Kamchatka and Japan. Turning to the west coast of North 

 America we find a different state of affairs. 



1. Twenty-one species do not extend north of San Francisco Bay, as follows: 



Astropecten calif omicus.'^ 

 Astropecten omatissimus. 

 Dipsacastfr eiimius. 

 Dytaster gilberti. 

 Luidia asthenosoma. 

 Luidia ludwigi. 

 Myonotus intermedius. 

 Pedinaster a. evoplus. 

 Odontaster crassus. 

 PseudarcJiaster pusiUus. 

 Ceramaster leptoceramus. 



Hippasteria califomica. 

 Cryptopeltaster lepidonotus. 

 Poraniopsis inflata. 

 Ilenricia I. dyscrita. 

 Henricia polyacantlia. 

 Ilenricia clarJci. 

 Solaster exiguus. 

 Pteraster trigonodon. 

 Pteraster coscinopeplus. 

 Pteraster t. arcuatus. 



2. The following southern Califobnian forms extend their range to Washington (*) 



A.ND southern ALASKA (f) BUT NOT NORTH OP SiTKA; 



Thri^sacanthias jjenicillatus* 

 Dipsacaster anoplus.* 

 Luidia foliolata. t 

 Asterina miniata.f 



Henricia I. annectens* 

 Heterozonias alteniatus* 

 Pteraster jordani* 



oTo Bodega Head, just north o! San Francisco Bay. 



