198 
THE VOYAGE OF H.M.S. CHALLENGER. 
Chorological Synopsis of the Species herein described. 
Ocean. Range in Fathoms. Nature of the Sea-bottom. 
Astropecten acanthifer Eastern Archipelago. 140 Blue mud. 
Astropecten brasiliensis Atlantic. 7 to 20 Shallow water. 
Astropecten brevispinus Pacific. 345 Green mud. 
Astropecten cingulatus Atlantic. 32 to 4001 Red mud. 
Astropecten granulatus : Eastern Archipelago. 28 Green mud. 
Astropecten hermatophilus . Atlantic. 450 Voleanie mud. 
Astropecten imbellis Eastern Archipelago. 100 Green mud. 
Astropecten trregularis Atlantic. 640 374 | suse 
Astropecten japonicus Pacific. 5 to 50 cae ices ES 
Astropecten mesactus Atlantic. OO ied | e-5-. 
Astropecten monacanthus Eastern Archipelago. 20 Mud. 
Astropecten pectinatus Pacific. 6 to 40 Sand and shells. 
Astropecten polyacanthus Pacific. QitorDOM |e ees 
Astropecten pontoporeus Atlantic. 5 to 20 Shallow water. 
Astropecten velitaris . : Eastern Archipelago. LOntOR2DI yn eeeees 
Astropecten zebra : ‘ Eastern Archipelago. 8 Coral mud. 
Astropecten zebra, var. rosea Eastern Archipelago. 6 Coral mud. 
1. Astropecten brasiliensis, Miiller and Troschel. 
Astropecten brasiliensis, Miiller and Troschel, 1842, System der Asteriden, p. 68. 
Localities.—Off Bahia. Depth 7 to 20 fathoms. 
Off Fernando Noronha. Shallow water. 
Remarks.—The examples from Fernando Noronha, when compared with similar-sized 
specimens from Bahia, have the supero-marginal plates comparatively narrower, and the 
rays also are proportionally rather narrower. In the armature of the adambulacral plates 
the spinelets on the actinal surface of the plates immediately behind the furrow series 
have often the appearance of forming a triple series, in consequence of the prominence of 
the small lateral spinelets which accompany the large spine. These specimens have a very 
prominent and well-defined conical eminence in the central region of the disk. 
2, Astropecten brevispinus, Sladen (Pl. XXXIIT. figs. 1 and 2; Pl. XXXVI. figs. 
1-8). 
Astropecten brevispinus, Sladen, 1883, Journ. Linn. Soc.' Lond. (Zool.), vol. xvii. p. 249. 
Rays five. Breadth of a ray at the base, about 
11 mm, 
R=32mm.; r=10mm. R>3r. 
Rays tapering regularly from the base to the tip, and terminating in a point. Inter- 
brachial arcs slightly rounded. 
1 The exact station and depth at which this form was dredged are not recorded. 
