DOROCIDAEIS PANAMENSIS. 23 



fig. 16), it does not show plainly the greater size of the opening men- 

 tioned by Mortensen. The projection of calcareous ridges on the stalk of 

 the globiferous pedicellaria? (PI. IX. fig. 4) can hardly be considered a 

 generic character ; see PI. IX. fig. 12. 



This genus is established in spite of the fact that Doederlein had 

 already grouped together as Discocklaris certain species of Goniocidaris, 

 among which he included Goniocidaris florigera (Chall. PI. I. fig. 11), and 

 for reasons far more satisfactory than those assigned by Mortensen for 

 establishing Petaloeidaris. 



The association of Dorocidaris bracteata A. Ag. 1 with Stephanocidaris 

 hisjiiiiiisa is most unfortunate. The abactinal system of the genus is 

 so entirely unique among the Cidaridae that there is no excuse for 

 associating with it a species with the abactinal system of the species of 

 Dorocidaris. 



Mortensen also states that Dorocidaris panamensis is scarcely a Doro- 

 cidaris 2 because he supposes that species to have the form of pedicellarise 

 figured by him on PI. IX. %s. 9, 22, 24 for C. affinis, — a form of pedicel- 

 lariae occurring also, as Mortensen says, in 0. tribuloides and galapagensis, 

 metularia, verticillata, and baculosa, as well as P. imperialis and Goniocidaris 

 florigera. Surely a sufficiently varied series of forms to show how little 

 practical use this special type of pedicellarire must be ; and for this 

 heterogeneous group he retains the name of Cidaris (excluding P. imperialis 

 and G. florigera). 



Station 3367, off Cocos Island, 100 fathoms. Lat. 5 3 31' 30" N. ; Long. 

 86° 52' 30" W. Bottom temperature 57.1. Rocky. 



Station 3368, off Cocos Island, 66 fathoms. Lat, 5° 32' 45" N. ; Long. 

 86° 54' 30' W. Bottom temperature 58\4. Rocky. 



Station 3378, off Galera Point. 112 fathoms. Lat. 3° 58' 20" N. ; Long. 

 81° 36' W. Bottom temperature 55 .9. Brk. sh. 



Station 3397, off Galera Point, 85 fathoms. Lat. 70° 33' N. ; Long. 

 78° 34' 20" W. Bottom temperature -57 .3. Stf. gn. M. brk. sh. 



Bathymetrical range 66-112 fathoms. Range in temperature 58 .4-55 .9. 



1 Not Ag. as marked by Mortensen. 



2 This will be examined in the Report on the Hawaiian Echini. 



