REPORT ON THE ECHINOIDEA. 105 



1, 4), arranged iu horizontal rows on the central part of the plate and forming indistinct 

 vertical rows. There are but few small secondaries and mUiaries. The abactinal system 

 is large (PI. XII.* fig. 2) ; the ocular plates are small, somewhat pear-shaped, scarcely- 

 exceeding in size some of the larger of the many plates covering the anal system ; the 

 genital plates are short, triangular. The colour of this species in alcohol is light violet- 

 brown, the primary spines are slender pointed and comparatively short on the abactinal 

 surface, stouter and somewhat larger on the actinal side. 



Station 169. July 10, 1874. Lat. 37° 34' S., long. 179° 22' E. ; 700 fathoms; 

 bottom temperature, 4*2° C. ; grey ooze. 



ECHINOMETRAD^. 

 Family Echinometbad^, Gray, 1855, Proc. Zool. Soc. Lond. 



Heterocentrotus. 

 Heteroccntrotus, Brandt., 1835, Prod. Des. An. 



Heterocentrotus mammillatus. 



Gidaris mammiUafa, Klein, 1734, Nat. Disp. EcL 

 Heterocentrotus mammillatus, Brandt, 1835, Prod. 



Kandavu Eeef. 

 Heterocentrotus trigonarius. 



Echinus trigonarius, Lamk., 1816, Anim. sans Vert. 

 Heterocentrotus trigonarius, Br., 1835, Proc. Desc. 



New Caledonia. 



Echinometra. 



Echinometra, Rondel, 1554, De Piscib. Mar. (Breyn.). 



Echinometra lucunter. 



Cidaris lucunter, Leske, 1778, Kl Add. 

 Echinometra lucunter, Blainv., 1834, Actin. 



Samboangan, 10 fathoms. 



Kandavu Reef. 



Tongatabu Eeef. 18 fathoms. July 24, 1874. 



Papeete Reef. September, 1875. 



Honolulu. August, 1875. 



Cebu, Philippine Islands. 



(zool. CHALL. EXP. — PART IX. — 1881.) 1 14 



