Page:American Seashells (1954).djvu/247

Rh % 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.