126 bulletin: museum of comparative zoology. 



Station 4965. Between Kobe and Yokohama, Japan, 191 fathoms. 



4967. Between Kobe and Yokohama, Japan, 244-253 fathoms. 

 " 50S6. Sagami Bay, Hondo, Japan, 292 fathoms. 

 Three specimens. 



Prionechinus ruber A. Ac. and Clark. 



Tins species may be recognized by the following combination of characters. 

 The test and abactinal system show little evidence of sculpturing ; the anal system 

 is covered by ten to twenty plates, of which one is somewhat larger than the others; 

 there are ten large buccal plates, each with a well developed tube-foot, and between 

 these plates and the mouth the membrane is closely covered with small plates; 

 the primary spines are nearly or quite smooth and rather sharply pointed; the test and 

 basal half of the larger spines are red, while the tips of the spines and some of the 

 tubercles are pure white. The larger specimen is 11 mm. in diameter. 



Station 4933. Off Kagoshima Gulf, Japan, 152 fathoms. 



" 4967. Between Kobe and Yokohama, Japan, 244-253 fathoms. 



Two specimens. 



Genocidaris apodus A. Ag. and Clark. 



This interesting species is easily recognized by the very large anal plate, the 

 long primary spines which when unbroken exceed the diameter of the test, and 

 the presence of only five large buccal plates, provided with a tube-foot. The 

 second plate of each pair is rudimentary and carries no pedicel. There are no 

 other plates on the buccal membrane. The test is very distinctly sculptured, but 

 the abactinal system is nearly smooth and carries very few (15-25) small tubercles. 

 The genital pores are large, in the centre of a slight elevation. The abactinal 

 system is very large, its diameter sixty per cent or more of that of the test. The 

 test and spines are white, but in the smallest specimen (the only one with un- 

 broken spines) the terminal half o'f the longer primaries is red. The largest 

 specimen is only 7 mm. in diameter. 



Station 4891. Southwest of Goto Islands, Japan, 181 fathoms. 

 " 4904. Southwest of Goto Islands, Japan, 107 fathoms. 



Three specimens. 



TRIPLECHINIDAE A. Ag. 



Hemipedina mirabilis Dod. 



Eemipedina mirabilis Doderlein, 1885. Arch. f. Naturg., Jalirg., 51, Bd. 1, p. 96. 



The excellent series of specimens now before us confirms our recently expressed 

 opinion (Bull. M. C. Z., 50, p. 245) that this species is quite distinct from H. 

 inclica de Meij. 



