﻿132 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



varices flattened and extended. The type has the operculum broad 

 ovate, with the nucleus close to but not reaching the anterior lateral 

 margin. 



Genus EUGYRINA Dall, n. n. 



Type Ranella gigantea Lamarck (= olearia Linne, fide Hanley). 

 Recent. Synonyms: Gyrina Schumacher, 1817, not Gyrinus Linne, 

 1758; Ranella Cossmann, 1903. 



This comprises the large thin Tritons with irregularly distributed 

 low varices, sculptured narrow body-callus and outer lip, a slender 

 and rather long canal, and the operculum with an apical incurved 

 nucleus. The sculpture is tubercular. 



Genus ARGOBUCCINUM Morch, 1852 



Type Ranella vexillum Broderip, Chile. Recent. Synonyms: 

 Argobuccinum H. and A. Adams, 1858, not 1853; Apollon Adams, 

 Gray, not Montfort. 



Stout, dull-colored shells with dense periostracum, spiral sculpture, 

 few and inconspicuous irregularly placed varices, and a short canal. 



The operculum as in Gyrineum. 



Subgenus Paralagena Dall, n. 11. 



Type Triton clandestinus Lamarck. Recent. Synonym: Lagena 

 Morch, 1852, not Walker, 1784. 



Shell with even spiral sculpture, a moderately long curved canal, 

 the varix single and terminal, and the body almost destitute of callus. 



Subgenus Fusitriton Cossmann, 1903 



Type Triton cancellatus Lamarck. Recent. Synonyms: Argo- 

 buccinum (sp.) Adams, Pricnc (sp.) Carpenter. 



Group with the form of Eu gyrina, the operculum of Gyrineum, the 

 radula of Argobuccinum, and a thin cancellated shell, the species in- 

 habiting cool temperate waters. There is no callus on the body, and 

 very few feeble varices. 



Subgenus Priene Adams, 1858 



Type Triton scabcr King. Recent. Synonym: Argobuccinum 

 H. and A. Adams, 1853 not 1858. 



Resembling Fusitriton but with a much shorter canal, an operculum 

 with apical nucleus (Me Tryon) and a slight, more or less Urate 

 body-callus. 



