STEAMONITA. lt 



P. H^EMASTOMA, Linn. 



I cannot separate the numerous species which are referred to 

 the haemastomoid group ; they appear to be at best mere names 

 for geographical groups, Avhich, whilst usually presenting some 

 slight peculiarities, invariably connect themselves with the parent 

 form. As might he expected under these circumstances, the 

 various monographers in endeavoring to recognize a number of 

 these species, differ among themselves quite as much as do the 

 shells under consideration ; I will not attempt to disentangle all 

 this synonymy, but will proceed to designate by name a certain 

 number of forms (I cannot call them varieties, much less 

 species). 



Haemastoma (typical). PI. 49, figs. 80, 84 ; pi. 50, fig. 87. 



This has two rows of tubercles and an orange-colored mouth. 

 It is principally Mediterranean and West African, but recurs in 

 the West Indies and W. Coast of Mexico also. A smoother 

 state from Barcelona has been called P. Barcinonensis by M. 

 Hidalgo (fig. 84). Sometimes the spire is drawn out, becoming 

 baby Ionic ; this elate form is represented by a figure in d'Orbigny's 

 Mollusca of the Canary Isles (fig. 87) ; it occurs also upon the 

 Gulf Coast of the United States. 



Undata, Lam. PI. 49. fig. 82; PL 50, figs. 100, 103; PI. 51, 

 fig. 109. 



By common consent, the usual W. Indian manifestation of P. 

 kaemastotna bears this name, although the form which it charac- 

 terizes is equally common on the W. Coast of America, and in the 

 East Indies. The shell is generally smaller, less tuberculated, the 

 pattern of painting more defined (undulated or striped), the mouth 

 white or fasciated within instead of orange color. P. Forbesii, 

 Bunker (fig. 100), from Guinea, W. Africa, belongs to this form. 



Floridana, Conrad. PI. 49, figs. 83, 85 ; PL 50, figs. 86, 90, 94. 



This is a still less tuberculate form, with yet more distinct 

 painting, and P. fasciata, Reeve (fig. 90), is a depauperate or 

 worn state of the same. It is West Indian, but Conrad includes 

 in his species a var. of hsemastoma figured by Dunker, from 

 Guinea, W. Coast Africa (fig. 83). Another figure of haemastom,a 



