190 HAWAIIAN AND OTHER PACIFIC ECHINI. 



proct there is a faint indication of an anal fasciole. The sternum is about 9 

 mm. long and about 6 mm. broad posteriorly; it is fairly well covered with 

 primary tubercles. The labrum and peristome (PL 148, fig. 8) are very 

 small; the former carries no tubercles and the latter is covered by numerous 

 small plates. The primary tubercles and spines are rather sparsely scattered 

 over the test, but miliary tubercles (not shown in the figures) are fairly abun- 

 dant except actinally on the ambulacra. The test and primary spines are 

 whitish, but the peripetalous fasciole is distinctly purplish. 



Only one pedicellaria was found. That was a tridentate, with a short 

 stalk only about one third as long as the head. The valves, which were about 

 .25 mm. long, were slender, not compressed, and were rounded at the tip. 



The specimen upon which this species is based is obviously immature 

 and in the absence of genital pores, it is certainly hazardous to put it in this 

 genus. But the general facies is so much like Hypselaster brachypetalus that 

 there is little doubt of its generic position. 



Station 4913. Southwest of Koshika Islands, Japan. Bott. temp. 41.9°. 

 391 fms. Gy. glob. oz. 



One specimen. 



Hypselaster kempi. 



Periaster kempi Koehler, 1914. Ech. Indian Mus. Spat., p. 162. 



This is a well-defined species of good size characterized by the shape of 

 the test, the position of the apical system, the relative proportions of the petals, 

 and the form of the globiferous pedicellariae. Koehler considers it nearly 

 allied to limicolus, but this does not seem so. Koehler, however, appears to have 

 neglected the important point made by both Mr. Agassiz and Dr. Mortensen 

 that the "limicola" recorded in the Challenger Report from the Arafura Sea 

 is not limicola and is not even congeneric with it. When therefore Koehler 

 compares the globiferous pedicellariae of kempi with those of the "Umicoia" 

 from the Arafura Sea, he is not making any comparison with the true limicola! 

 As a matter of fact the globiferous pedicellariae of kempi raise the question 

 at once whether the species should be placed in Hypselaster, but I hesitate 

 to reject it on that account alone. The Investigator took kempi in the 

 Laccadive Sea in 1150-1170 fms. and in the eastern part of the Bay of Bengal 

 in 1192 fms. 



