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° 28' W. 75 m., South 
Georgia), 4 fullgrown male specimens and one young specimen. 
KOEHLER, in discussing the relations of the genus Aniphipnetistes , comes to the 
result that it is nearest related to Palœopneustes. It certainly must be conceded 
that A. Lorioli has a very great resemblance to Palœopneustes cristatus A. Ag. 
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 Palœopneustes and Abatus. However, 
the affinity seems to be more towards Abatus. It is a noteworthy fact that the 
pedicellariæ of Palœopneustes * differ considerably from those of Amphipneustes , 
which latter genus, on the other hand, resembles Abatus in the structure of the 
pedicellariæ. Unfortunately globiferous pedicellariæ have not been found in Palœo- 
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 Palœopneustes 
more closely. 
* The pedicellariæ of Palceopn. 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 pedicellariæ are very numerous here, but also the tri- 
dentate pedicellariæ are of quite a different structure. Otherwise I think Gregory was right in separating 
P. hystrix from the genus Palœopneustes , making it the type of his new genus Archœopneustes , leaving P. 
cristatus as the type and only recent species of Palœopneustes. (I. W. Gregory, Archæopneustes abruptus 
a new genus and species of Echinid from the Oceanic series in Barbados. Qu. J. Geol. Soc. Vol. 48, 1892. 
p. 163.) 
