150 JUNE. 



A close ally of this form is a pretty shell which we 

 often obtain by dredging, called the Cup-and-Saucer 

 Limpet. It is a pretty little white porcellaneous cone, 

 with a curved plate of thin shell projecting from the 

 side of the interior, like a semi-cup within the cup. It 

 is named Calijptrcea. Both this and the Torbay Bonnet 

 have been ascertained to manifest domestic instincts, 

 in sitting on their eggs till they are hatched. Accord- 

 ing to MM. Audouin and Milne Edwards, the parent 

 Calyptrcea "disposes them under her belly, and pre- 

 serves them, as it were imprisoned, between the foot 

 and the foreign body to which she adheres, her patelloid 

 shell thus serving not only to cover and protect herself, 

 but as a shield to her offspring. These eggs are oval 

 bodies of a yellow colour, enclosed in membranous cap- 

 sules, which are elliptical, flattened, translucid, and 

 filled with an albuminous matter. The number of these 

 little capsules varies from six to ten ; they are connected 

 among themselves by a footstalk, so as to represent a 

 sort of rosette ; each of them contains from eight to ten 

 eggs. It appears that the young CalyptrcBa are de- 

 veloped under this sort of maternal roof, and do not 

 quit it until they are in a condition to affix themselves, 

 and are provided with a shell sufficiently hard to protect 

 their own bodies." 1 



Along the margins of these shallow rock-pools with 



1 Litt. de la France, i. 133. 



