258 bulletin: museum of comparative zoology. 



and the genital opening in the right anterior plate is much smaller than the 

 other three. 



Station 4070. Off Puniawa Point, Maui, 45-52 fathoms. 



Brissus carinatus Gray. 

 Spatangus carinatus Lamarck, 1816. Anim. s. Ver. 3, p. 30. 

 Brissus carinatus Gray, 1825. Ann. Phil. 10, p. 9. 

 There is a bare test, 55 x 42 mm., from Laysan Island, which is undoubtedly 

 this species. We also refer to Brissus, and probably carinatus, a young Spatan- 

 goid about 10 mm. long, in which the petals are not quite perfect and are little 

 sunken, while the subanal fasciole is disproportionately large. It was taken at 

 Station 4147, vicinity of Modu Manu, in 26 fathoms. 



Metalia maculosa A. Ag. 



Echinus maculosus Gmelin, 1788. Linn. Sys. Nat., p. 3199. 

 Metalia maculosa A. Agassiz, 1872. Rev. Ech., Pt. 1, p. 144. 

 A small fragment of the right posterior ambulacrum and part of the posterior 

 interambulacrum of a large Spatangoid from Station 4149 is evidently from the 

 test of one of this species. 



Station 4149. Off Modu Manu, 33-71 fathoms. 



Aceste Wtv. Thom. 

 Aceste Wyville Thomson, 1877. Voy. Chall. Atlantic, 1, p. 376. 

 There are a few good specimens, and fragments of several others, of this genus, 

 but none of them seem to be bellidifera, the only species hitherto known. They 

 all agree in having the posterior extremity nearly vertical and the anterior furrow 

 deep and with nearly vertical sides. The actinal plastron is perfectly flat and 

 does not project either in front of or below the mouth. In these particulars the 

 specimens are evidently different from bellidifera, and the difference is emphasized 

 when the relative length of the plastron is noted. In bellidifera the plastron 

 measures from the posterior edge of the tuberculated portion to the mouth, only 

 about .65 of the length of the test, while in the Hawaiian specimens it is con- 

 siderably more than .75. Not only do these specimens differ from bellidifera, 

 but those from the west end of Molokai are obviously different from those taken 

 off the west coast of Hawaii, and we are accordingly obliged to recognize two new 

 species of Aceste. 



Aceste ovata A. Ag. and Clark. 



The points in which this species differs from bellidifera have already been 

 stated. The largest specimen is 19 x 15 mm. and the others are nearly as large. 

 The test is broadly ovate, rounded behind. It slopes backward slightly from the 

 posterior edge of the fasciole for a very short distance, and is then vertically trun- 

 cated. The fasciole is nearly oval and not angular, though it is somewhat pointed 

 behind. The color of these specimens is light brown, with the fasciole a some- 

 what darker brown. 



