No. 447.] HAMINEA SOLITARIA SA Y. 



209 



gration the shell has the dead white color mentioned by Gould. 

 In view of these variations I think that the shell as originally 

 described by Say is identical with the insatlpta of Totten and is 

 the solitaria found in the vicinity of Woods Holl, Mass, and of 

 Long Island, X. Y. 



Pilsbry has decided to limit the family BuUidaj to the single 

 genus Bulla. Formerly the members of the Akeridae were 

 included with the Bullidas but the character of the radula, form 

 of the shell, and relation of the animal to it enables one to 

 sharply differentiate the two families. 



The Bullida; have in the radula a few longitudinal rows of 

 teeth (formula I. 2. I. 2. I.). The animal is capable of complete 

 retraction into the shell. There are no epipodal or parapodal 

 lobes ; the foot is long and tapering behind. The shell has a 

 mottled color pattern. 



The animal described by Say, Totten and others and referred 

 to in this article is placed by Pilsbry ^ in the family Akerida^ 

 and in the genus I laminea. " The Akeridx are a much lower 

 stock of Tectibranchs than Bullida;, retaining the primitive 

 multi-dentate rathila. and the epipodal lobes, and having a thin, 

 fragile unicolored shell. 



The f(jllowing is the specific descri])tion of Haminca solitaria : 

 " Shell thin, subcylindrical. with gently convex sides, truncate 

 vertex and rounded base ; color horny or light brown. Surface 

 shining, having irregular growth wrinkles and (under a lens) 

 Jint; deeply impressed spiral grooves, much narrower than their 

 intervals, sometimes with smaller ones intercalated. Vertex 

 white, somewhat impressed in the middle, sul)]>erforate. Lij) 

 arising to the right of the center, slightly 

 thickened; outer lip gently arched forward. 

 Columella thin, concave. Alt. 10. diam 

 6^ mill " (Fig. 2). 



Habitat. — Until the report of X'crrill. 

 ('71-72) nothing was said of the animal or 

 its natural history. All writers coyfmed them^ehe^ to a con- 

 chological description of the species. Verrill says that solitaria 



