CATALOG OF RECENT ECHINOID TYPE SPECIMENS 55 



Periaster fragilis A. Agassiz and H, L. Clark 



Bulletin of the Museum of Comparative Zoology at Harvard, vol. 51, 

 no. 5, p. 138, 1907. 



= Hy pse las ter fragilis (Agassiz and Clark)--see H. L. Clark, 1917, p. 

 189; also, Mortensen's Monograph of the Echinoidea, vol. 5, no. 2, p. 

 321. 



Holotype: 



USNM E794 (dry). Albatross sta. 4913, southwest of Koshika Island, 

 Japan, 3lO39'10"N., 129O22'30"E., 391 fms., Aug. 11, 1906. 



Periaster maximus A. Agassiz and H. L. Clark 



Bulletin of the Museum of Comparative Zoology at Harvard, vol. 50, 

 no. 8, p. 259, 1907. 



= Hypselaster maximus (Agassiz and Clark)--see H. L. Clark, 1917, 

 p. 186; also, Mortensen's Monograph of the Echinoidea, vol. 5, no. 2, 

 p. 321. 



Holotype: 



USNM E796 (dry, fragment), Albatross Sta. 4139, off Hanamaulu, 

 Kauai, Hawaii, 283-309 fms., Aug. 1, 1902. 



Periaster rotundus A. Agassiz and H. L, Clark 



Bulletin of the Museum of Comparative Zoology at Harvard, vol. 51, 

 no. 5, p. 138, 1907. 



= Hypselaster rotundus (Agassiz and Clark)--see H. L. Clark, 1917, 

 p. 187; also, Mortensen's Monograph of the Echinoidea, vol. 5, no. 2, 

 p. 315. 



Holotype: 



USNM E795 (dry), Albatross Sta. 4946, between Kagoshima and Kobe, 

 Japan, 31°29'10"N., 130O34'30"E., 39 fms., Aug. 20, 1906. 



Periaster tenuis A. Agassiz 



Bulletin of the Museum of Comparative Zoology at Harvard, vol. 32, 

 p. 82, pi. 11, figs. 6-7, 1898. 



= Hemiaster tenuis (Agassiz)- -see Mortensen's Monograph of the 

 Echinoidea, vol. 5, no. 1, p. 390. 



Syntypes: 



MCZ 2850 (3 dry). Albatross Sta. 3398, off Galera Point, Eucador, 

 1°7'N., 80O21'W., 1,573 fms. 



MCZ 2851 (1 dry). Albatross sta. 3399, off Galera Point, Ecuador, 

 1,740 fms. 



MCZ 2852 (1 alcohol), same as 2850. 



Pericosmus melanostomus Mortensen 



U.S. National Museum Bulletin 100, vol. 14, pt. 3, p. 119, 1948. 



Holotype: 



USNM E7153 (dry), Albatross Sta. 5302, China Sea, near Hongkong, 

 21°42'N., 114°50'E., 38 fms., Aug. 9, 1908. 



