STRONG YLOCENTROTUS. 155 
made of a well-grown specimen from Hardangerfjord, as the Col- 
lection contains but few specimens and all small. According to 
Sars this species is very rare. It has been sometimes thought to be 
‘a variety of Z. norvegicus; with the small number at my disposal 
I am quite able to see the points of difference. 
Distribution. Both sides of Atlantic ; Mediterranean ; Admiralty 
Islands. Down to 1350 fms, 
a-d, St. 47 a*. ‘ Porcupine Exp.,’ 1868, 
e-h. S.W. Ireland, 250 fms. ‘Flying Fox’ Exp. 
7,j. 54 miles off Achill Head, 500 fms. Royal Dublin Society. 
k, l. 45 miles off Blackrock, 500 fms. Royal Dublin Society. 
Echinus melo, Lamk. 
I cannot inscribe this species in the list of British specimens on the present 
record ; Forbes (Rep. Brit. Assoc. 1850 (1851), p. 123) speaks of an Echinus 
which “ appears to be identical with the Echinus melo of the Mediterranean,” 
as having been found by Mr. Peach on the coast of Cornwall. In his ‘ Revision ’ 
Prof. Alex. Agassiz makes no reference to this, but in the Proc. Roy. Soe. 
Edinb. xi. (1882), p. 697, he reports EZ. melo from off North Rona, after saying 
“there is nothing new.” 
2. STRONGYLOCENTROTUS. 
Echinus (pars), O. F. Miiller, Prod. Zool. Dan. (1776) p. 285; Molina, 
Stor. nat. Chili, (1782) p. 348. 
Echinus (Toxopneustes) (pars), dg. § Des. Ann. Sci. Nat. vi. (1846) 
. 367. 
Siren oceninatad, Brandt, Prodr. descr. Anim, (1835) p. 63; Gray, 
Proc, Zool. Soc. 1855, p. 87 ; A. Agass. Rev. Ech. (1872) pp. 161 & 
276; Carus, Prod. Faun. Med. (1884) p. 99; Duncan, J. Linn. Sve. 
xxiii. (1889) p. 121. 
Heliocidaris (pars), dg. § Des. Ann. Set. Nat. vi. (1846) p. 371. 
Echinometra, Gray, Brit. Rad. (1848) p. 4. 
Loxechinus, Desor, Syn. Ech. fuss. (1858) p. 136. 
Psammechinus (pars), Duj. § Hup. Ech. (1862) p. 525. 
Spherechinus (pars), zd. ¢. ¢. p. 529. 
Anthocidaris, Liith. Vid. Medd. 1863 (1864), p. 164. 
Euryechinus, Verrill, Proc. Bost. Soc. Nat. Hist. x. (1866) p. 341. 
An echinine Echinid in which the secondary plates are formed of 
more than three primary plates. Test circular or subpentagonal ; 
gill-slits well marked. 
Key to the Species. 
Primary spines hardly larger than secondaries .... 1. S. droehachiensis. 
Primary spines distinctly larger than secondaries... 2. S. lividus. 
* No Station “47a” is given in the Report of the Voyage published in the 
Proc. Roy. Soc. 1869-70; Stat. 47 was at 59° 34’ N., 7° 18’ W., depth 
2 fms. 
