52 BULLETIN 76, UNITED STATES NATIONAL MUSEUM. 



Specimms examined.-T\w following; is a complete list of localities from which 

 one hundred and seventy-eight specimens have been exammc.I: 

 Specimens of Leptychaster anomalus examined. 



2g«;.. 



2848.. 

 2849.. 

 28S2.. 

 2854.. 

 2855.. 



3223.. 

 3224.. 

 3257.. 

 3263.. 

 3310.. 

 33U.. 

 3313.. 

 3334. 

 3480. 

 3488. 

 3501. 

 3548. 

 3002. 



4233.. 

 42C5.. 

 4280.. 

 4286.. 

 4S3S.. 

 4768., 

 4775. 

 4784. 

 4818. 

 4867. 



LofttUty. 



Depth. 



Vicinity ot Shumagln Islands, .\laska. 



Off Kadlak Island, .\laska 



Oa SItkaUdak Island, vicinity Kadlak 



Island, Alaska. 

 Bering Sea, vicinity ot Unalaska. Alaska. 

 North of Unlmak Island, Alaska 



Vicinity of Unalaska, Alaska. 



.do. 



West of St. Paul Island, Bering Sea.. 



.do. 



South of St. George Island, Bering Sea. 



Near Unlmak, Aleutians 



Bering Sea, vicinity of Prlbllof Island.. 



Shumagln Islands, Alaska 



Unalaska 



Nature of bottom. 



fine gray sand, 

 green mud 



green mud . 



black pebbles 



black sand and gravel 



gray sand and gravel — 



black mud 



tine dark sand and mud. 



green mud 



fme black sand 



mud and sand 



green mud, fine sand 



green mud, gray sand . . . 



green mud 



black mud 



green mud, sand 



Number 

 of speci- 

 mens. 



U. S. Nat. Mus. 



No locality <■ 



Vicinity of Naha Bay, Behm Canal, 

 southeastern Alaska. 



Vicinity ot Yes Bay, Behm Canal 



on Sitka Sound, Alaska 



Chlgnlk Bay, Kadlak Island 



.do. 



Off Monterey Bay, California . 

 Bowers Bank, Bering Sea 



Vicinity of Attn Island, Aleutians 



Sea of Japan (38*08' N.; LM'Sl' E.)... 

 Sea of Japan 



57-63 

 871-795 



rocky . 



gray mud, rocky 



green mud, rocky 



green mud, black sand . 



green mud, rooks 



gray sand and rocks 



greenish brown mud . . . 



green mud 



coarse pebbles 



fme brown mud 



green mud 



Do. 

 Do. 

 Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 U. S.Nat. Mus., W.H. 



Dall, No. 6073. 

 U. S. Nat. Mus. 

 AOatTOss, 1903. 



Do. 



Albatross, 19^4. 

 Albatross. 1906. 



o Bottles broken by earthquake, 1906. i Not typical. 



ReriMrhs. — The reasons which may be advanceil for placing this species under 

 the genus Leptychaster are the following: Leptychaster arcticus, which ranges into 

 Bering Sea, has in the same region a close relative, pacificus, wMch differs in 

 possessing broader and less numerous marginal plates. The su]ieromarginals of 

 arcticus are throughout the ray scartiely larger than paxillffi, but are of conspicuous 

 size in pacificus, and in the interbrachial region are considerably witier than midway 

 along ra\'. After a close comparison of the two forms it has not been possible 

 to separate them generically. The character of the marginals, abactinal paxillse, 

 adambuhicral plates and armature, distribution of gonads, and distribution of 

 papulae arc essentially tlie same in the two forms. The width of the superomar- 



