^Tggs!'] PROCEEDINGS OF THE NATIONAL MUSEUM. 331 



stomahi the Xiitiouul collection (No. 05953), from AbrolLos Island, coast 

 of Brazil. 



72. Purpura cingulata Liiinarck. 



Two specimens; Cape Town (Mus. No. 125324.) 



Only two examples of this remai'kably variable and intei-estiiig" species 

 Avere obtained; the hui^cr 17.5 millimeters in length, with barely the 

 hint of a keel on the npper part of the bnsal whorl, which otherwise is 

 finely sculptured Avith closely set, fine incised lines or grooves, and 

 the upper or apex wliorls keeled and cancellated. The small exami)le 

 is only 4 millimeters long, equal to the two and one-half upper Avhorls 

 of the larger shell. Tlie National collection contains another and 

 somewhat larger specimen of this nearly smooth variety, as Avell as 

 one individual Avith a single broad keel upon the up])er part of the 

 basal A'olutiou, connecting, it Avill be seen, the plain form Avith the 

 usual broadly ribbed and channeled typical specimens. 



73. Purpura neritoidea Linni^. 



Three beach specimens. Porto (irande (Mus. No. 1253G9). These 

 are of the typical knobby form. 



(ieims .SISTRUM Moiitfort. 



74. Sistruni nodulosuni C. B. Adams. 



One adult, one junior; beach. Porto Grande (Mus. No. 125302). 

 Common at many jtlaces in the Antillean region and on the Florida 

 Kej's, etc. 



75. Sistrum Brownii iioin. prov. 



One specimen. Porto Grande (Mus. No. 125357). 



Of the .same general facies as >S'. uodulosuni, butA^arying in sculi>tural 

 characters; the National collection contains a similar example from the 

 west coast of Florida. 



Suborder STREPTODONTA. 

 Sui>eT-fUinily l^TKIsTOGM^OSSA. 



Family .lANTHINID.E. 



(ieinis JANTHINA Lamarck. 

 76. Janthiua rotundata J^eacli. 



= Janihiiia communis Lamarck. 

 Five examines. Fayal, one specimen (Mus. No. 125297); Porto 

 Grande (Mus. No. 125311), four examples of rather small size, but 

 characteristic. 



