272 CALYPTR/EID^E. 



C. militaris and Cochlolepas antiquata are West- 

 Indian; Lister figured them as from Barbadoes. 

 The reported British localities are incorrect, and depend 

 chiefly on the authority of Bryer and Laskey. The 

 latter goes so far as to say that he procured both in 

 the Frith of Forth "by deep dredging." Weinkauff 

 enumerates C. militaris as an Algerian shell : possibly 

 he fell into the same error as Macgillivray and Wood. 



Piliscus commodus of Middendorff has been dredged 

 by Mr. Dawson in the Moray Firth, but apparently in 

 a semifossil state. It is known living only in the sea 

 of Okhotsk, although occurring in the older or glacial 

 strata at Uddevalla, and (under S. Wood's name of 

 Capulus fallax) in the Coralline Crag. Possibly C. ob- 

 liquus of the last named author, from the Red Crag, 

 may be the same species. 



Family IV. CALYPTE^E'ID^E, Broderip. 



BODY round or oval, more or less depressed : mantle entire : 

 head not very prominent, terminating in a short but extensile 

 muzzle: tentacles, eyes, and gills as in the Capulidce: foot 

 separate from the lower part of the body, and expanded. 



SHELL shaped like a cap or slipper and depressed, partly 

 spiral : beak turned towards the rear, and twisted to the left : 

 mouth round and oval : inside furnished with a partition or 

 diaphragm, the outer edge of which forms an incipient or 

 rudimentary pillar. 



The Calyptraidte have the same habits as the Capu- 

 lid<R ; each family has only a solitary representative in 

 our seas, although their members are numerous in 

 warmer latitudes. Chenu says that the present family 

 first made its appearance in the upper part of the Chalk 

 formation. 



