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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXV. 



c 2 . One interpolated series, followed by one or more extraneous series; 

 basals narrow, forming, in dorsal view, a rounded stellate figure; 



infrabasals large and prominent a Isocrinus (fig. 27) 



d\ First two post-radial joints united by syzygy; lower pinnules serrate; 

 reentrant angles of stellate figure formed by basals shallow. 



[subgenus Cenocrin us] 



d 2 . First two post-radial joints united by synartliry; lower pinnules 



smooth; reentrant angles of stellate figure formed by basals deep. 



[subgenus Isocrinus] 



'. Tax and Z 2 the first and second joints of the free undivided arm, separated 



from the radial s by two or more interpolated series; infrabasals 



always (?) absent 6 Endoxocrinus (lig. 26) 



Genus METACR1NUS P. H. Carpenter, 1882. 



Genotype. — Metacrinus wyvillii P. H. Carpenter, 1884. 

 Geographical distribution. — Northern Australia and East Indies 

 northward to Japan. 



Depth.— m to 630 fathoms: 

 Included species: 



Metacrinus ucutus Doderlein. 



Metacrinus angulatus P. II. Carpenter. 



Metacrinus cingulatus P. H. Carpenter. 



Metacrinus costatus P. H. Carpenter. 



Metacrinus mosleyi P. II. Carpenter. 



Metacrinus murrayi P. H. Carpenter. 



M. murrayi. var. nobilis P. H. Carpen- 

 ter. 



.1/. murrayi, var. timorensis Doderlein. 



Metacrinus nodosa s P. H. Carpenter. 



Metacrinus rotundas P. H. Carpenter. 



.1/. rotundas, var. interrupt us P. II. 

 ( 'arpenter. 



Metacrinus serratus Doderlein. 

 Metacrinus stewarti P. H. Carpenter. 

 Metacrinus suluensis Doderlein. 

 Metacrinus superbus P. H. Carpenter. 

 M. superbus, var. borealis c A. H. Clark. 

 M. superbus, var. tuberculatus d A. H. 



Clark. 

 Metacrinus tuberosus P. H. Carpenter. 

 Metacrinus rarians P. H. Carpenter. 

 Metacrinus wyvillii P. H. Carpenter. 





Genus HYPALOCRINUS, new. 



Genotype. — Pentacrinus naresianus V. II. Carpenter, 1S82. 

 Geographical distribution. — Kermadec Islands, Meangis Islands. 

 Fiji. Celebes, and Philippines. 

 )>< pth.— 500 to 1,350 fathoms. 



" In fifteen specimens of /. decorus, including a very small ten-armed specimen 

 with arms 25 mm. long the infrabasals are large and prominent, showing no 

 trace of resorption; material of other species was not available. 



6 Infrabasals are absent in all specimens dissected, including one with arms 

 only 25 mm. long. 



c This variety differs from the typical form mainly in having the division 

 series and arm bases smooth instead of very rough. 



d This form has the division series with strong tubercles, but otherwise resem- 

 bles the preceding. 



