ECHINOIDEA. II. 157 



such indifferent characters as a soniewhat more compact test with a slight keel from the apex to the 

 anal system, a closer tuberculation and a slightly sharper peripetalous fasciole; characters which are 

 found in speciniens coming from snch distant localities as the Coast of Norvvay and the western 

 shore of Spain . The species has further been recorded from that region by Bell (Echinoidea of Sonth 

 Africa. p. 175I and recently by Doderlein (Echinoidea d. deutsch. Tiefsee-Exp. p. 256), both authors 

 likewise regarding the Cape-specimens as specifically identical with the B. lyrifcra from the Northern 

 Atlantic; Professor Doderlein, however, points ont as differences between the two forms that in the 

 northern speciniens the anterior end is considerably lower than the posterior, the odd interambulacrnm 

 rising somewhat (-; kraftig ), which is not the case in the Cape-form. Fnrther the anterior petals are 

 straight in the northern form, whereas in the Cape-specimens the petals are slightly cnrved (but only 

 in the larger speciniens). In the pedicellariæ Doderlein finds no essential difference between the 

 two forms. 



Any fuither differences in the structure and the shape of the test between the Cape-specimens 

 and the northern form of Brissopsis lyrifera I have been unable to find by a brief examination of 

 the Challenger -speciniens in the British Museum. In the pedicellariæ, however, I find some small 

 differences. The globiferous pedicellariæ often, though not always, show the peculiar feature of the 

 edge of the basal part of the valves being very irregular (PI. XVIII. Fig. 3);" the upper end of the 

 stalk is niostly irregular with a projection on one side (PL XVIII. Fig. 23); otherwise they agree with 

 those of the northern form of lyrifcra. The larger forms of tridentate pedicellariæ do not show any 

 reliable differences from those of the northern form, whereas the second, smaller form differs rather 

 considerably from the corresponding form in the northern specimens (PI. XIX. Fig. 2, comp. with 

 PI. XIX. Fig. 3), the outer part of the blade being more rounded and the lower part less narrowed. 

 The rostrate pedicellariæ are also very like those of the northern form, only the quite small specimens 

 of this form (PI. XIX. Fig. 9) have the valves lower and broader than is generally the case in those 

 of the northern specimens. I have found no form corresponding to the simply leafshaped tridentate 

 pedicellariæ of the northern specimens. Ophicephalous pedicellariæ I have not found. In the triphyllous 

 pedicellariæ and the spicules no differences are found between the Cape-specimens and those from 

 the northern seas. — The differences in the shape of the test and the form of the petals pointed out 

 by Doderlein together with the differences in the pedicellariæ shown here seem to nie to justify 

 separating the Cape-specimens at least as a distinct variety, which I niay name capensis n. var. But 

 I should not be surprised, if on a careful comparison of a larger material of the Cape-form witli the 

 northern form the former should prove a distinct species. 



In the British Museum I have further examined a « Challenger »-specimen of ^..Brissopsis lyri- 

 /era» from Simon's Bay, which is, however, not this species. (There are two labels in the glass, one 

 with Br. lyrifera, the other with Br. lusonica, which seems to indicate that Agassiz was in doubt of 

 the right Identification; nothing is, however, said thereof). The specimen is ca. 18""" in length. 

 The labrum reaches to the suture between the first and second adjoining ambulacral piates. Only 

 two pairs of pores are included within the subanal fasciole, the first plate included being the 6th. 

 The anterior petals are scarcely longer than the posterior ones; they point almost directly out- 



I In the valve figured here one of the terminal teeth is abnornially curved inwards. 



