ECHINOSOMA LUCULENTUM. 163 



132° 24' 30" E. Bott. temp. 40.1°. 405 fathoms. Gn.-bn. m., fne. gy. a., 

 for. 



Station 4973. Between Kobe and Yokohama, Japan ; 33° 24' 15" N., 

 135° 30' 30" E. Bott. temp. 38.2°. 600 fathoms. Bn. m., st. 



Station 4980. Between Kobe and Yokohama, Japan ; 34° 9' N., 137° 55' 

 E. Bott. temp. 39°. 507 fathoms. Bn. m., fne. s., for. 



Station 5078. Off Omai Saki Light, Japan ; 34° 12' 20" N, 138° 2' 30" 

 E. Bott. temp. 38.9°. 475-514 fathoms. Fne. gy. s., glob. 



Station 5080. Off Omai Saki Light, Japan ; 34° 10' 30" N., 138° 40' E. 

 Bott. temp. 38.7°. 505 fathoms. Fne. gy. s., glob. 



Station 5082. Off Omai Saki Light, Japan ; 34° 5' N., 137° 59' E. 

 Bott. temp. 37.7°. 662 fathoms. Gn. m., fne. s., glob. 



Station 5084. Off Omai Saki Light, Japan ; 34° N., 137° 49' 40" E. 

 Bott. temp. 36.8°. 918 fathoms. Gn. m., fne. s., glob. 



Station 5086. Sagami Bay, Japan ; 35° 8' 15" N., 139° 20' E. Bott. 

 temp. 43.7°. 292 fathoms. Gn. m., crs. bk. s. 



Bathymetrical range, 292-1008 fathoms. Extremes of temperature, 

 43.7°-36.8°. 



Thirteen specimens. 



Echinosoma luculentum A. Ag. and CI. 



Fhormosoma luculenta A. Agassiz, 1879. Proc. Am. Acad., XIV., p. 201. 



Phormosoma luculentum A. Agassiz, 1881. " Challenger " Ech., p. 97; Pis. IX; X; Xa, 



figs. 3-7. 

 Hygrosoma luculentum Mortensen, 1903. " Ingolf " Ech., I, p. 59. 



Hygrosoma asthiopicum Doderlein, 1905. Zool. Anz. XXVIII, p. 621. 1906. Ech. d. 

 deutscheu Tiefsee-Exp. Pis. XVI ; XVII, fig. * ; XXXIX, figs. l-2f. 



We are so fortunate as to have before us a small specimen of cethiopieum 

 from " Valdivia " Station 246. A careful examination of this specimen, in 

 connection with Doderlein's description and figures, leads us to believe that 

 the form cannot properly be distinguished from luculentum, for as already 

 stated we do not consider the absence of the short, thick pedicellarise a valid 

 specific character. We are even suspicious of the validity of luculentum 

 itself, for we shall not be surprised if this species proves to be simply a form 

 of hoplacantha. The differences that have been pointed out in either the 

 test or the pedicellarite do not seem to us very weighty, and their constancy 

 has yet to be proven. 



