156 Marine Shells of the Western Coast of Florida 



with about 10 spirals distributed to base of canal; whorls angulated 

 by peripheral spiral, smooth above to suture; aperture oval, purple 

 within; outer lip thin, columellar lip callus, crenate, lirate within; 

 anterior canal short, straight, open. A notch at columellar side of 

 canal indicates site of previous canal aperture. Operculum corneous, 

 brown, fusoid with apical nucleus. 



Two types of this shell are observed. The less common form 

 is taken in one to six fathoms and differs from descriptions in the 

 following respects. The shell is white without and within; a little 

 longer and heavier than the dark form; incremental lines stronger; 

 body whorl with six strong revolving ribs, between the pairs of first 

 and second, and fifth and sixth strong spirals is a smaller cord; less 

 strong spirals to base of canal; whorls above periphery are ribbed 

 with five spirals. The operculum is blond — pale-straw color. Animal 

 cream color. 



Genus UR0SALP1]VX Stimpson, 1865 

 Urosalpinx-^s* pernig-ata-ss (Conrad) PI. 31, fig. 220 



Alt., to 25 mm. Shell somewhat fusiform, white or cinereous, 

 dark-colored between varices which are often touched with yellow. 

 Six slightly keeled whorls and large smooth nucleus; body whorl 

 moderate size, sutures distinct; longitudinally ribbed; spirally striate; 

 sculpture strongest below periphery of whorls; aperture oval, dark- 

 colored within, outer lip thin, crenate; canal short, straight, open, 

 slightly curved backward; operculum yellow, nucleus at outer border. 



Two to six fathoms. 

 Egg capsules of llrosalpinx perrugata (Conrad) PI. 50, fig. 341 



The capsules of U. perrugata and Cantharus floridanus are so 

 similar as to cause confusion. "Hie three to five mm. purse-shaped 

 cases are laid in overlapping rows of irregular groups upon other 

 egg capsules, those of Busycon and Fasciolaria most frequently. 

 There is evidence that Urosalpinx penetrates the egg capsules of the 

 host and devours the contents. From three to eight embryos develop 

 in each capsule. 



284 Uro, combining form from Gr., oura, tail; salpinx, trumpet. 

 -^^ F., perrugup, from Pr. pcrucat, with dressed hair. 



