PLEUROBRANCHIDAE 



287 



ish. Gill plume on right side of body, with 20 to 22 primary leaflets on each 

 side, with a nodule on the main stem where they originate. Primary leaflets 

 with 1 5 smaller leaflets, each of which has 5 to i o microscopic plates. Shell 



Figure 61. Pleiirobranchus atlmiticits Abbott, i V2 inches. 2 and 3, entire animal; 

 4, rhinophore; 5, cross-section of velum; 6, genitalia; 7, details of gill plume; 8, 

 shell; 9, radula; 10, platelets in mandibles. (From R. T. Abbott 1949, Nautilus 



vol. 62.) 



small, calcareous, pinkish white, flat with a small spire, and located under the 

 dorsum. Moderately common in shallow water in winter on Soldier Key, 

 near Miami. Originally collected by F. M. Bayer, P. gardineri White is a 

 synonym. 



