Bd VI: 4) THE ECHINOIDEA. 99 



This interesting species was taken by the Swedish South Polar Expedition at 

 Station 17 (53°34' S. 43°23' W. 160 m., Shag Rock Bank), 2 fullgrown female spe- 

 cimens and 3 young specimens, and Station 22 (54° 17' S. 36 c 28' W. 75 m., South 

 Georgia), 4 fullgrown male specimens and one young specimen. 



KOEHLER, in discussing the relations of the genus Amphipneustes, comes to the 

 result that it is nearest related to Palceopneustes. It certainly must be conceded 

 that A. Lorioli has a very great resemblance to Palceopneustes cristatus A. Ac 

 On the other hand, the new species of Amphipneustes here described shows beyond 

 doubt many relations to Abatus, with which genus it agrees in every essential re- 

 spect, except in the lack of fascioles. It would thus seem that Amphipneustes 

 forms a connecting link between the genera Palceopneustes and Abatus. However, 

 the affinity seems to be more towards Abatus. It is a noteworthy fact that the 

 pedicellariae of Palceopneustes * differ considerably from those of Amphipneustes, 

 which latter genus, on the other hand, resembles Abatus in the structure of the 

 pedicellariae. Unfortunately globiferous pedicellariae have not been found in Palceo- 

 pneustes. — I cannot, however, enter here on a more detailed discussion of the 

 affinities of these genera, having not yet had the opportunity to study Palceopneustes 

 more closely. 



* The pedicellariae of PaLvopn. cristatus have not been described in a more detailed manner; but I 

 have had occasion to examine those of a specimen in the British Museum: it is especially a conspicuous 

 difference from Amphipneustes that ophicephalous pedicellariae are very numerous here, but also the tri- 

 dentate pedicellarise are of quite a different structure. Otherwise I think Gregory was right in separating 

 P. hystrix from the genus Palizopneustes, making it the type of his new genus Archceopneustes, leaving P. 

 cristatus as the type and only recent species of Palceopneustes. (I. W. Gregory, Archseopneustes abruptus 

 a new genus and species of Echinid from the Oceanic series in Barbados. Qu. J. Geol. Soc. Vol. 48, 1892. 

 p. 163.) 



