204 HAWAIIAN AND OTHER PACIFIC ECHINI. 



this form from the Mediterranean Sea, giving it the varietal name mediterranea, 

 but the varietal characters seem insignificant, and my skepticism as to the 

 validity of the species is increased by its occurrence in the Gulf of Naples where 

 lyrifera is not rare. 



Brissopsis luzonica. 



Kleinia luzonica Gray, 1851. Ann. Mag. Nat. Hist., (2) 7, p. 133. 

 Brissopsis luzonica A. Agassiz, 1872. Rev. Ech., pt. 1, p. 95. 



Plates 152, figs. 5-8; 155, figs. 2, 3. 



The large series of Brissopsis in the Albatross collections from Hawaii 

 and Japan has been the object of much study in an attempt to separate B. 

 oldhami from B. luzonica. The differences mentioned in the preliminary papers 

 (1907. Bull. M. C. Z., 50, no. 8 and 51, no. 5) do not prove constant; the most 

 typical luzonica grade by imperceptible degrees into typical oldhami, and I 

 have finally decided that there is only one species in the series before me. 

 Furthermore I am satisfied that the peculiarities of the young Brissopsis, to 

 which the name circosemita was given are not specific but are individual and 

 that the specimen is best treated as a young luzonica. I have, however, given 

 figures (PL 152, figs. 5-8) showing the characters on which the supposed species 

 was based, for they will be useful in working out the growth-changes in luzonica. 

 For comparison with B. pacifica photographs of a typical adult (PI. 155, figs. 

 2, 3) are also given. 



Station 3737. Near entrance to Port Heda, Japan. Bott. temp.? 161- 

 167 fms. Gn. m., vol. s. 



Station 3824. Off Lae-o Ka Laau Light, Molokai, H. I. Bott. temp. 

 49.5°. 222-498 fms. Cor. r., brk. sh. 



Station 3826. Off Lae-o Ka Laau Light, Molokai, H. I. Bott. temp. 41.5°. 

 371-430 fms. Gy. m., cor. r. 



Station 3836. Off Lae-o Ka Laau Light, Molokai, H. I. Bott. temp. 48°. 

 238-255 fms. Br. gy. m., s. 



Station 3839. Off Lae-o Ka Laau Light, Molokai, H. I. Bott. temp. 

 46.3°. 259-266 fms. Lt. br. m., s. 



Station 3842. Off Lae-o Ka Laau Light, Molokai, H. I. Bott. temp. 40.5°. 

 495-506 fms. Fne. br. s., m., r. 



Station 3863. Between Molokai and Maui, H. I. Bott. temp. 60°-61°. 

 127-154 fms. Brk. co., crs. gr., r. 



