92 America?! Se ash ells 



Gulf of Mexico and the West Indies. 



1/4 to 2 inches in length and width. Umbilicus sealed over. Sculpture 

 of finely beaded, small spiral threads. Characterized by a relatively short but 

 wide slit at the periphery of the body whorl just behind the outer lip. Color 

 dull orange-yellow with darker maculations. Base white. Interior slightly 

 pearly. Dredged from 73 to 130 fathoms. One of our rarest seashells. 



Subgenus Entemnotrochus P. Fischer 1885 

 Ferotrochus adansonianus Crosse and Fischer Adanson's Pleurotomaria 



Plate 3d 



Cuba and the Lesser Antilles. 



3 inches in length, and slightly more in width. Umbilicus round, very 

 deep. Sculpture of coarsely beaded, moderately small spiral threads. Slit on 

 periphery of whorl narrow and very long ( ^ of a whorl) . Color cream with 

 a salmon blush and irregular, small patches of red. Base similarly colored. 

 Dredged from 94 to 100 fathoms, but sometimes brought up in fish traps. 

 This is an exceedingly rare species. 



Family HALIOTIDAE 

 Genus Haliotis Linne 1758 



Haliotis cracherodi Leach Black Abalone 



Plate zf 



Coos Bay, Oregon, to Lower California. 



6 inches in length, oval, and fairly deep. Outer surface smoothish, ex- 

 cept for coarse growth lines. Usually 5 to 8 holes are open. External color 

 bluish to greenish black. Interior pearly-white. A fairly abundant, edible 

 species although not fished commercially to any great extent. A littoral spe- 

 cies which clings to rocks between tide marks. Some shells may lack the 

 holes (unnecessarily named H. c. holzneri Hemphill, H. c. imperforata Dall 

 and H. c. lusus Finlay). A subspecies, H. c. calif orniensis Swainson, occurs 

 on Guadalupe Island and is characterized by 1 2 to 16 very small holes. H. c. 

 bonita Orcutt is the same as this subspecies. H. c. splendidula Williamson is 

 the typical cracherodi. 



Haliotis rufescens Swainson Red Abalone 



Plate 2 a 



Northern California to Lower California. 



10 to 12 inches in length, oval, rather flattened. Outer surface rather 

 rough, dull brick-red with a narrow red border around the edge of the shell. 

 Interior iridescent blues and greens, with a large central muscle scar. 3 to 4 



