ECHINOIDEA. II. 



nation (PI. XL Figs. 20, 34) as well as the miliary spines (PI. XI. Figs. 37, 41) and the clavulse agree 

 with those of Jeffrey si. 



The tube-feet are small and simple, without spicules, but generally with a calcareous cap as 

 in Jcjfrcysi. The sphseridiae placed singly, not presenting peculiar features. The pedicellariae are repre- 

 sented by the same three kinds as in Jeffreysi. The rostrate pedicellariae (PL XI. Figs, i, 19, 23) are 

 characteristic, broadly rounded and rather densely serrate at the point, differing distinctly from those 

 of Jeffreysi. The ophicephalous pedicellariae are much more alike in the two species, only the terminal 

 portion is perhaps upon the whole a little smaller in P. Wandeli (PL XI. Figs. 13, 14). The tridentate 

 pedicellariae (PL XI. Fig. 40) are alike in both species. 



The internal anatomy agrees with Jeffreysi, only the female genital organs are slightly ramose. 

 The genital openings are not yet developed in a specimen of 2O min length, but in a specimen of 2i ram 

 they are found; on the other hand they are not yet fully developed in a specimen of 26 mm . It is thus 

 evident that this species is not mature before it has reached a size of a little over 2o mm length. The 

 largest specimens are 53 mm . Distinct genital papillae are found in the grown specimens. 



The colour is dark violet; also the spines may be so coloured (always so in life?). According to 

 a coloured sketch from a living animal (St. 36) the living animal is more claret coloured, or to speak 

 very exactly, intermediate between <:vinosus and atro-violaceus , with a tint of atropurpureus 

 along the abactinal keel. (Saccardo. Chromotoxia. Ed. II. 1894). 



This species was taken by the Ingolf at the following stations: 



St. 18 (61 44' Lat. N. 30 29' Long. W. 1135 fathoms 3o C. Bottom temp.) i specimen. 



) i 



) r 9 



) 8 - 



Most of the specimens were broken. Further a pair of broken specimens were taken by the 

 Thor St. 164 (62 10' Lat. N. 19 36' Long. W. 1 144 fathoms) ; they are mentioned as Pourtalesia miranda? 

 in Johs. Schmidt: Fiskeriundersogelser ved Island og Faer0erne i Sommeren 1903. p. 24'. - The 

 species is thus known to occur in the warm area of the Northern Atlantic from South of Iceland to 

 Davis Strait, from 8451715 fathoms; probably it will prove to be distributed over a large part of the 

 warm area of the Atlantic. It seems to be a more exclusively deep-sea species than P. Jeffreysi. 



I have named this species in honour of the chief commander of the Ingolf -Expedition, Ad- 

 miral Wan del. 



P. Wandeli is, evidently, rather nearly related to P. Jeffreysi, but is easily distinguished from 

 the latter species, mainly by the shape of the test, the long, curved and thorny abactinal spines and 

 the rostrate pedicellariae. Its relation to P. miranda A. Ag. is, for the present, not quite clear, because 

 our knowledge of the latter species is rather unsatisfactory. In the <.Panamic Deep-Sea Echini? 

 p. 139 it is stated that the type specimen was only 3-5 rain in length; nevertheless it was mature, the 

 genital openings being already fully developed, as shown in Fig. 9. PL XVII of ;Rev. of Echini? and 



1 Skrifter udgivne af Kommissionen for Havundersogelser. No. I. 1904. Kobenhavn. 



The Ingolf-Expedition. IV. 2. n 



