190 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Araeosdma violaceum Mortens. 



Araeosoma violaceum Mortensen, 1903. "Ingolf" Ech., I, p. 176. 

 West of Ireland ; 199 fathoms. 



We know nothing further of this species than what is given in the 

 original brief description. 



Araeosoma coriaceum Mortens. 



Asthenosoma coriaceum A. Agassiz, 1879. Proe. Am. Acad., XIV, p. 201. 1881. 

 " Challenger " Ech., PL XVIIa, figs. 5-7. 1904. Pan. Deep Sea Ech., p. 115, PI. 52. 

 Araeosoma coriaceum Mortensen, 1903. "Ingolf" Ech., I, p. 53. 



Vicinity of Tonga and Fiji Islands; 240-310 fathoms. 



The large size, dark brown color, and very leathery test are noticeable 

 features of this species. 



Araeosoma tessellatum Mortens. 



Asthenosoma tessellatum A. Agassiz, 1879. Proc. Am. Acad., XIV, p. 201. 1881. 

 "Challenger" Ech., Pis. XlXa, fig. 1; XlXb. (Not A. tessellatum A. Ag. and CI., 

 1907. Bull. M. C. Z., LI, p. 117.) 

 Araeosoma tessellatum Mortensen, 1903. " Ingolf" Ech., I, p. 54. 



Philippine Islands; 100-115 fathoms. Kei Islands; 168 fathoms. 



We are unable to add anything further to the facts known about this 



species. 



Araeosoma fenestratum Mortens. 



Calveria fenestrata Wyville Thomson, 1872. Proc. Roy. Soc. London, XX, p. 494. 1874. 



Phil. Trans. Roy. Soc. London, 164, pt. 2, Pis. LXIII, figs. 9, 10; LXVI, LXVII. 

 Asthenosoma fenestratum A. Agassiz, 1881. "Challenger" Ech., p. 210. 

 Araeosoma fenestratum Mortensen, 1903. " Ingolf" Ech., I, p. 52. 

 Asthenosoma Reynoldsii A. Agassiz, 1S80. Bull. M. C. Z., VIII, p. 75. 

 Asthenosoma hystrts A. Agassiz, 1883. "Blake" Ech., Pis. XIII, XIV. 



North Atlantic Ocean ; 81-373 fathoms. 



PI. 66, fig. 20. 



While we do not feel sure that the Caribbean species {Reynoldsii) is 

 identical with Wyville Thomson's fenestratum, as we have had no European 

 specimens for comparison, it seems to be true, as Mortensen has pointed 

 out, that both are distinct from hjstrix. It is worthy of note that in the 

 Caribbean specimens the dactylous pedicellariae, which may be entirely 

 wanting in otherwise normal specimens, not rarely have five valves (PI. 66, 

 fig. 20). The very large tridentate pedicellariae are sometimes wanting. 



