CYMBIOLA. 97 



Sect. 8. Cymbiola, Swainson. 



Shell oval, thin, recalling the form of Cymbium. Spire more 

 or less elongated, terminated by a slightly irregular, papilliform 

 summit. Aperture large, the columellar side covered with a 

 slight coat of enamel ; columella usually with four oblique 

 plications ; outer lip sharp, occasionally slightly expanded. 

 An American, and principally Antarctic group. 



Y. ANCILLA, Solander. PI. 29, fig. 110. 



Yellowish, with faded chestnut, longitudinal, irregular streaks. 



Length, 5-6-5 inches. 



Coast of Patagonia. 



This is the V. Magellanica, of Sowerby, Kiener and Gould, 

 who describe the latter species as ancilla ; the latter has an 

 excellent figure of the animal. 



Y. STEARNSIT, Dall. PI. 30, fig. 130. 



Livid purple, more or less obscured by an ashy white outer 

 layer ; exterior smooth, but not polished ; aperture white and 

 livid purple, with a dash of brighter purple at the posterior 

 notch, and on the anterior portion of the callus. 



Length, 4'13 inches. 



Alaska ; living from stomach of cod, dead on beach. 



Yery closely related to V. ancilla. 



Y. MAGELLANICA, Lam. PL 29, figs, lot, 108. 



Yellowish white, generally irregularly painted with longitu- 

 dinal, zigzag, brown streaks, sometimes interruptedly banded. 



Length, 5-6 inches. 



Patagonia. 

 Yar. TUBERCULATA, Swains. 



Whorls with a more pronounced, tuberculate shoulder. 

 A wider species than V. ancilla but may possibly be a mere 

 variet}' of it. 



Y. BECKII, Brod. PI. 29, fig. 109. 



Yellowish, with chestnut-colored, undulated, longitudinal 



streaks. Length, 11 to 14 inches. 



Habitat unknown. 



The Philadelphia Academy possesses a specimen of the largest 

 13 



