ECHINOIDEA. I. 



165 



but frequent are the reddish or dark, almost black specimens; a fine violet specimen may now and 

 then be found (PI. I. Figs. 5— 6. PI. II. Figs. 3— 5). 



Rodger (333. p. 163) speaks of an «extraordinary variety of Sir. drebackiensis, with enormous 

 pedicellaria; . It must decidedly be asserted that a variety cannot be established characterized by 

 especiallv large pedicellaria;; the size of the globiferous pedicellaria; (and they are certainly meant) is 

 so verv varying, that it would be a quite absurd thing to distinguish different forms by this feature; 

 the difference in size is, moreover, increased by the neck of the pedicellaria; being now stretched out, 

 now retracted. We might with more probability expect to find a difference of importance in the 

 tridentate pedicellaria;, but the different varieties cannot be distinguished by means of those either. 

 A «Var. with slender, reddish spines*, mentioned by Verrill (416. p. 504), is scarcely better characterized 

 than the other varieties. 



There are in the literature a few statements of other regular Echinids from the North-European 

 seas. Agassiz (10) enumerates Echinus tnclo among Echinids from the Faroe-Channel, but adds: 

 there is nothing new». Here must, I think, be some mistake, and I must quite agree with Bell 

 (Catal. p. 155) that Ech. melo cannot on this basis be included in the fauna of the North-European 

 seas — quite apart from the question, whether Ech. uiclo can upon the whole be kept up as a 

 distinct species. 



Dalla Torre (108. p. 92) mentions o.Strongylocentrotiis, lividus from Helgoland; this is, no 

 doubt, a confounding with Str. drobachicnsis, which latter is not named. Further Her dm ami 

 (194. p. 89) mentions *Str.i> lividus from Norway without further informations; this is surely also 

 a mistake. The Norwegian coast-fauna has been so excellently examined by so many eminent 

 Norwegian naturalists, that it is quite inconceivable that this large, fine Echinid should have been 

 overlooked. Finally SI niter (371. p. 70) states to have a specimen of Sphcerechinus granularis from 

 Denmark. Unfortunately we must relinquish our claim to the joy of having this beautiful and inter- 

 esting Echinid in our seas; the northermost locality, from which it is known, is the Channel Isles. 

 (Bell. Catalogue, p. 106). 



f Table of the Echinids of the Families Echinids and Toxopneustidae 1 ) occurring in the northern Atlantic 



and the Mediterranean. 



1. The spicules simply bihamate, the globiferous pedicellaria; 

 with 1 — more lateral teeth on either side 2. 



The spicules branched at the ends or dumb-bell-shaped, 

 the globiferous pedicellaria; without lateral teeth 13. 



2. The pores trigeminate 3- 



multio-eminate Paracentrotus lividus (Lamk.i. 



3. The globiferous pedicellaria; with the edges of the blade 



fine, projecting into several large indentations on either 



side; no cross-beams connect the edges across the inside.. 4. 



'I In this table the species Echinus gracilis, atlanticus, and lucidus have been included, so that it comprises all 

 sure Ec/tinus-species. 



