46 "endeavour ' SCIENTIFIC RESULTS. 



occupied by about ten similar plates ; these plates are more 

 quadrilateral than the abactinal plates and differ in being less 

 swollen, much more completely covered with granules and in 

 having the central granule replaced by a more or less con- 

 spicuous spine, 1-5 mm. long, 1-2 mm. in diameter, and 

 bluntly pointed, clavate or chisel-shaped at tip ; these spines 

 are smallest near the inferomarginals and largest near the 

 adoral adambulacrals ; the granules are coarser than on the 

 abactinal surface and there is less distinction between 

 " crowning " and " marginal " granules ; many granules are 

 replaced by the large, characteristic pedicellariae. Adambu- 

 lacrals about 55, wider than long or squarish, quite similar to 

 the actinolaterals in having marginal granules on the adoral, 

 outer and aboral sides, a group or series of somewhat coarser 

 granules on the outer end and a large spine at or near the centre ; 

 these spines may exceed 5 ram. in length ; on the first two 

 plates (near mouth) and occasionally elsewhere, a second 

 spine, similar but much smaller, stands just behind the large 

 one ; on the furrow margin of the plate is a series of 7-8 

 crowded, compressed, blunt spines of which the four or five 

 middle ones are sub-equal, about 2 mm. long, while the aboral, 

 and the adoral (1 or 2) are markedly shorter and more pointed ; 

 on the adoral, marginal corner of the plate is a very large 

 pedicellaria, of the same type as those elsewhere, but with 

 jaws of very different shape, 1.5-2 mm. long, slenderly spatu- 

 late and slightly asymmetrical, bluntly pointed. Oral plates 

 not particularly large or prominent ; each has 7 or 8 large, 

 furrow spines, the proximal ones very large and prismatic ; 

 each plate bears on its surface two large spines hke those on 

 the adjoining adambulacral plates. Colour (dry), pale yel- 

 lowish-brown. 



This is the most notable and the best characterised of all 

 the " Endeavour's " Starfishes, not previously known to 

 science. The adambulacral armature with big pedicellariae 

 and the spiny actinal interradial areas distinguish it at once 

 from any other member of the genus, although it seems to be 

 nearest the Phihppine species C. corynetes, since it has pedi- 

 cellariae hke those of that species, spines on the actinal plates 

 and an adambulacral armature of the same type. It is readily 

 distinguished from C. corynetes, however, by the absence of 

 spines on the terminal plate and by the granulose abactinal 

 plates. The diagnosis of Calliaster as given by Fisher^ will 

 require considerable modification to admit this fine new 

 species from Austraha (and the Phihppine form, too), for 



1. Fisher— Bull. U.S. Nat. Mua., Ixxvi., 1911, p. 171. 



