REPORT ON THE ASTEROIDEA. 197 
nearly to Panama. Astropecten erinaceus, from California to Peru. 
Astropecten fragilis, from Panama to Peru. Astropecten perwvianus, 
off Peru. 
The species dredged during the Challenger Expedition are marked in the foregoing list 
with an asterisk. 
8. Bathymetrical range: Shallow water to 450 fathoms. 
The majority of the species are confined to the Littoral zone; and none 
extend into the Abyssal zone. Only three forms are found in the Continental 
zone (v.¢., in depths between 150 and 450 to 500 fathoms), viz., Astropecten 
brevispinus in 345 fathoms, Astropecten hermatophilus in 450 fathoms, and 
Astropecten irregularis in 375 fathoms. 
Greatest range of one species: Astropecten irregularis, from shallow water 
to 375 fathoms. 
y. Nature of the Sea-bottom: Exact particulars of the nature of the habitat of the 
Littoral species are available in very few instances. Of the forms obtained by 
the Challenger, Astropecten acanthifer and Astropecten japonicus were found 
on Blue mud, the latter also on sand. Astropecten brevispinus, Astropecten 
granulatus, and <Astropecten imbellis were found on Green mud, in depths 
between 28 fathoms and 345 fathoms. Astropecten cingulatus lives on Red 
mud. Astropecten hermatophilus on Voleanic mud in 450 fathoms ; the greatest 
depth at which Astropecten has been found. 
The localities of the following species are unknown, and their names have consequently 
not been included in the foregoing list :-— 
Astropecten alatus, Perrier. Astropecten dussumiert, Perrier. 
Astropecten arenarius (Val.), Perrier. Astropecten hispidus, Miiller and Troschel. 
Astropecten buschii, Miiller and Troschel. ' Astropecten tiedemanni, Miller and Troschel. 
Astropecten calcitrapa, Lamarck, sp. 
The types of the following species appear to be lost, and as it is in my opinion impos- 
sible to identify them, I consider that the names should in future be discarded. To 
endeavour to recognise them is simply an exercise of the imagination. 
Astropecten diplacanthus, Grube. ; Astropecten mesodiscus, Linck. 
Astropecten echinatus major, Linck. Astropecten olfersit, Grube. 
Astropecten echinatus minor, Linck. Astropecten regularis, Linck. 
Astropecten fimbriatus, Linck. Astropecten stellatus, Linck. 
Astropecten gracilis, Gray. 
