190 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Araeosdma vioiaceum Mortens. 



AraeoBoma vioiaceum 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. Proc. Am. Acad., XIV, p. 201. 1881. 

 " Challenger " Ech., PI. XVIIa, figs. 5-7. 1904. Pan. Deep Sea Ech., p. 116, 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 01., 

 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. 



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



rhil. 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, 1880. Bull. M. C. Z., VIII, p. 75. 

 Asthenosoma hystrix 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 (Rn/noldsii) is 

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

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

 out, that both are distinct from h>/strix. It is worthy of note that in the 

 Caribbean specimens the dactylous pedicellarije, which may be entirely 

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

 fig. 20). The very large tridentate pediccllaria3 are sometimes wanting. 



