BURSIDAE 197 



% to 2^2 inches in length; whorls distorted, aperture with grotesque 

 arrangement of the teeth; siphonal canal twisted. Whorls with coarse retic- 

 ulate pattern. Parietal shield glossy, reticulated with raised threads, colored 

 white to brownish white. Differs from constricta mcgintyi in having a less 

 distorted body whorl which is more evenly rounded and more evenly knobbed 

 or reticulated. The parietal wall is generally reticulated instead of pustuled. 

 Dredged from 5 to 65 fathoms. Frequently brought in by shrimp fisherman. 



Distorsio constricta mcgintyi Emerson and Puffer 1953 McGinty's Distorsio 



Plate 2 52 



North Carolina to south half of Florida. 



I to 2 inches in length, very close to clatbrata, but the body whorl is 

 very distorted, bulging and with cruder nodules. The upper and inner corner 

 of the aperture usually has only one small, short, white tooth, while in cla- 

 tbrata there are usually 2 fairly large, longer, obliquely set teeth. The lower 

 parietal wall has a deep, smooth, wide groove separating the two axial rows 

 of teeth. Commonly dredged from 25 to 125 fathoms. Formerly called D. 

 -ftoridana Olsson and AlcGinty 1951 (not floridana Gardner 1947). Typical 

 constricta Broderip is from the Eastern Pacific. 



Genus Charonia Gistel 1848 

 Charojiia tritonis nobilis Conrad Trumpet Triton 



Plate 5f 



Southeast Florida and the West Indies. 



Adults I to I % feet in length. The early whorls are purplish pink. In old 

 specimens these are usually lost. Adults usually have a swollen, angular 

 shoulder on the last whorl, a feature which distinguishes our Atlantic sub- 

 species from the typical tritonis Linne of the Indo-Pacific area. C. atlantica 

 Bowdich is a synonym of the Pacific subspecies, despite the name. Rare in 

 Florida; moderately common in the West Indies below low water. 



Family BURSIDAE 



Genus Bursa Roding 1798 (= Ranella) 



Subgrenus Bursa s. str. 



'& 



Bursa thomae Orbigny St. Thomas Frog-shell 



Southeast Florida and the West Indies. 



V2 to I inch in length. Characterized by the varices being placed axially 

 one below the other and by the dehcate lavender aperture. Rare in moder- 

 ately shallow water. The posterior siphonal canal is prominent and not 

 attached to the body whorl. 



