ADDENDA. 381 



ADDENDA. 



On p. 73 the genus Podocidaris is stated to be monotypic, but after that 

 statement was pubUshed, Dr. W. K. Fisher sent me a single specimen of a Podo- 

 cidaris which was found by him among the starfishes collected by the "Albatross" 

 at the Hawaiian Islands. As it seems to be distinct from the West Indian species, 

 it may be described as 



Podocidaris ornata,i sp. nov. 



Plate 102, fig. 1. 



Test flattened, the height only 4 mm. while the horizontal diameter is 9 mm. 

 The abactinal system is 4.5 mm. across and the actinostome about half a milli- 

 meter more. The periproct is 2 mm. in diameter and is completely covered by 

 four equal plates. The primary spines are confined to the region below the 

 ambitus, as is characteristic of the genus, and are very flat, as seen from below, 

 but on the upper side are distinctly keeled along the median line. The longest 

 spines are not quite equal to half the diameter of the test, but they are very 

 broad, the width, half way between the middle and the tip, being equal to one 

 fourth of the length. Each spine ends in an enamel hoof, as usual in the family, 

 but this is scarcely noticeable from above. The '^ non-articulated spines" 

 or better, ''cychndrical tubercles," of the abactinal half of the test are slenderer 

 and less conspicuous than in sculpta; they also form less regular series, many of 

 them remaining very imperfectly developed. They are present in some numbers 

 on the genital and ocular plates and their arrangement there in two or three 

 series parallel to the distal margins of the genital plates, gives the abactinal 

 system a very ornamented appearance, quite different from that of sculpta. 

 The pedicellariie of ornata show no special peculiarities excepting that they are 

 more slender than in sculpta and the ophicephalous are smaller. The trident ate 

 have the valves about .30 mm. long but the blade where widest, near tip, is less 

 than .06 mm. broad; in sculpta, the blade is more than one fourth as wide as 

 the length of the valve. In the ophicephalous pedicellariae of ornatus the valves 

 are only .15-.20 mm. long. The spicules of the tube-feet are not distinguishable 

 from those of sculpta except in being rather more slender. The sphseridia are 

 like those of sculpta in form, but there seem to be two in each ambulacrum, one 



' ornalus = ornamented. 



