82 HAWAIIAN AND OTHER PACIFIC ECHINL 



CCELOPLEURUS. 



Agassiz, 1840. Cat. Sys. Ectyp. Ech., p. 19. 



Type-species, Cidaris coronalis Leske, 1778. Add. Klein, p. 72. 



Tertiary and Recent Arbaoiadae. 



The considerable amount of material which we have been able to examine, 

 including specimens collected by the "Challenger," "Blake," "Albatross," 

 and " Siboga," besides Michelin's type of Maillardi, has satisfied us that 

 at least five recent species of this genus must be recognized. The speci- 

 mens collected by the "Siboga" appear to be identical with Michelin's 

 species, which accordingly ranges from Mauritius to the Kei Islands in 38- 

 120 fms. The " Blake " specimens are all jioridanus A. Ag., which is found 

 throughout the West Indian region in depths of 56-1323 fms. Whether 

 the specimen from Agulhas Bank, off the southeastern coast of South Africa, 

 collected by the "Valdivia," and identified by Doderlein as Jlondanus, is 

 really identical with the West Indian species seems to us open to doubt. 

 The Saleniag taken in the sjime locality and called Pattersoni by Doderlein 

 is certainly not the West Indian species, and it seems highly improbable that 

 the specimen of Coelopleurus should belong to the Caribbean fauna. The 

 "Albatross" specimens are all macidatus A. Ag. and CI., while those taken 

 by the " Challenger " appear to have been in part maculatus, and in part 

 a hitherto undescribed species to which we have given the name longicollis 

 on account of the extremely long collar on the fully developed primaries. 

 The specimens of longicollis were taken in Basilan Straits, Philippine Islands, 

 in 82-102 fms. while maculatus was taken at Amboina, by the " Challenger," 

 in 100 fms. and off western and southern Japan, by the " Albatross," in 

 40-59 fms. There is also a specimen of maculatus from the Uraga Channel, 

 Gulf of Tokyo (East Coast of Japan), 70 fms., in the M. C. Z. collection. 

 The fifth species which we consider it necessary to recognize is the hand- 

 some form brought by Dr. Willey from New Britain, called by Bell (1899) 

 " Sahnacis^. clcgans,'' but which, as de Meijere (1904) has pointed out, is so 

 obviously a Coelopleurus, it seems odd that Bell failed to recognize the 

 genus. Assuming that the colored drawings are accurate, this species is 

 characterized by stout primaries with a very sliort collar, that taper very 

 little and are apparently not curved, as well as by its unusual coloration. 



The recent species of this genus are remarkable for their striking colors, 

 as well as for their slender, curved primary spines. The slenderness and 



