406 CYPILEID^E. 



three geographical varieties of his C. pediculus, viz. In- 

 dica, Europ&a, and Anglic a, the last being without 

 spots. Our species is the C. arctica, (Solander) Pulte- 

 ney, C. coccinella, Lamarck, C. mediterranea and C. 

 Europaa, Risso, and C. norvegica, Sars. The half- grown 

 shell is C. bullata of Pulteney, and the young (before the 

 outer lip is formed) is Bulla diaphana of Montagu and 

 B. Candida of Macgillivray. Among other provincial 

 names are " John-o'- Groat's buckie " and " sea-cradle.^ 

 The present species is the type of Gray's genus Trivia. 

 C. pediculus has been erroneously recorded as Euro- 

 pean by Turton and Collard des Cherres. C. moneta 

 (the money- co wry of South Africa) has been picked up 

 on the shore near Bangor, co. Down (Hyndman), in 

 Provence (Martin, fide Petit), and at Algiers (Wein- 

 kauff ) ; but these cases by no means prove that it in- 

 habits either the Irish sea or the Mediterranean. 



Genus III^O'VULA*, Bruguiere. PL VII. f. 5. 



BODY oblong : mantle pustulated or smooth : head fur- 

 nished with a contractile snout. 



SHELL forming a complete spindle, glossy, but spirally 

 striated : spire very short, perceptible in the young only, and 

 concealed in the adult : mouth extending the whole length of 

 the shell, channelled at each end : outer Up in some species 

 folded inwards and notched or thickened, in other species 

 prominent and thin : pillar smooth. 



The difference between a retractile proboscis and a 

 contractile snout is not, in my opinion, so important, 

 taken by itself, as to justify the separation of this genus 

 from the Cyprceidce. The passage from Cypraa to Ovula 

 is very gradual ; and these genera are closely allied, as 

 regards both the animal and the shell. The genus 

 * From ovulum, a little egg. 



