240 HAWAIIAN AND OTHER PACIFIC ECHINI. 



outline of the blade (PI. 146, fig. 18) is nearly circular as the tip is not at all 

 pointed; its length, however, exceeds its width. 



The original specimens of this species were from Sagami Bay, Japan. The 

 present collection contains a single specimen from 



Station 3713. Off Ose Zaki, Honshu Island, Japan. Bott. temp.? 45-48 

 fms. Vol. s., sh., r. 



Gonimaretia, gen. nov. 1 



Type, Gonimaretia tylota, sp. nov. 



As long ago as 1883, de Loriol (Mem. Soc. Phys. Hist. Nat. Geneve, 28, 

 no. 8, p. 50) called attention to the remarkable discrepancy between the descrip- 

 tion of Maretia alta A. Ag. in the Revision and the figures, labeled with that 

 name, in the Challenger Report. De Meijere (1904) and Koehler (1914) 

 having referred to the same difficulty, I recently explained it (1914, Spol. Zey- 

 lanica, 10, p. 91), pointing out that the specimen figured in the Challenger 

 Report is not alta but quite a distinct species. This specimen and others were 

 taken near the Kei Islands and several are in the M. C. Z. collection; while 

 not so large as the figured specimen, they agree with it in most particulars. 

 The well-developed sternum and the presence of only 3 genital pores made the 

 reference of these specimens to Maretia doubtful, and the discovery in the Alba- 

 tross collection of a closely allied species from the eastern Pacific, necessitated 

 the institution of a new genus for them. The fact that Studer's Lonchophorus 

 interruptus is apparently congeneric with them required consideration of the 

 question as to whether the group should not be called Lonchophorus. This name 

 originated with Studer (1880), in a generic sense, as a correction for Concho- 

 phorus Laube, which Studer considered a lapsus calami. The two names are 

 absolute synonyms and if either is used Conchophorus should have precedence ; 

 but Laube's group is quite indistinguishable from Spatangus and hence Con- 

 chophorus is a synonym of Spatangus. The present genus, Gonimaretia, is, 

 however, quite different from Spatangus and cannot be confused therewith. 

 The fact that ambulacrum III is not at all depressed, added to the characters 

 given in the key (p. 199), distinguishes Gonimaretia. The pedicellariae, so 

 far as known, fail to furnish any additional points of difference, though they 

 are not just like those of Spatangus. 



1 ToiWa = nnplo + Maretia, the name of an allied genus; m allusion to the sharp angle formed 

 by the poriferous areas in petals II and IV. 



