32 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 2826. Gulf of California, 24° 12' N., 109° 55' W. 9.5 fms. Sh. 

 Station 2828. Gulf of California, 24° 11' 30" X., 109° 55' W. 10 fms. Sh. 

 Bathymetrical range, 8-10 fms. 

 Three specimens. 



Clypeaster australasiae, comb, now 



Echinanthus australasiae Gray, 18.51. Proc. Zool. Soc. London, p. 34. 



Echinanthus testudinarius A. Agassiz, 1872. Rev. Ech., pt. 1, p. 108. H. L. Clark, 1909. .Mem. 



Austr. mas., 4, p. 558. 

 Plesianthus testudinarius Duncan, 1889. Journ. Linn. Soc. Zool., 23, p. 1.5-5. 



Plates 128, fig. 4: 134, figs. 1-3; 135, fig. 6. 



This species is apparently confined to the Southeastern coasts of Australia. 

 for there are as yet no reliable records from elsewhere. The spines show no 

 peculiarities. The pedicellariae are very scarce and show no characteristic 

 features. Only one ophicephalous, and half a dozen tridentate were found: 

 the head of the former was about .40 mm. long, while the valves of the tridentate 

 ranged from .15 to .85 mm. 



Clypeaster japonicus. 



Doderlein, 1885. Arch. f. Natuig., 51, 1, p. 100. 



Clypeaster clypeus Doderlein, 1885. Arch. f. Naturg., 51, 1, p. 100. 

 Clypeaster excelsior Doderlein, 1885. Arch. f. Naturg., 51, 1, p. 101. 

 Plesianthus ogasawaraensis Yoshiwara, 189S. Ann. Zool. Jap., 2, p. 60. 



Plates 128, fig. 5; 136, figs. 2-4; 138, fig. 5. 



This seems to be the common clypeastroid of Japanese waters. Although 

 it has usually been confused with one or the other of the two preceding spe 

 it is really quite distinct. It is rather variable, particularly in the form of the 

 test (compare PI. 136, figs. 2-4, with PI. 138, fig. 5) and this ha- led t<> the descrip- 

 tion of the several species mentioned in the synonymy. With Yoshiwara 's 

 type specimen of Plesianthus ogasawaraensis at hand for comparison I see no 

 reason for doubting that it is japonicus. The color differences have wholly 

 disappeared in alcohol and even in life are not very striking, BO that I cannot 

 feel they are of much importance. As I have stated above (p. 21 . Dr. Doderlein 

 has very kindly loaned me specimens of his Japanese species and we arc agreed 

 in considering clypew and excelsior as synonyms of japonicus; they are based 



