406 NATURAL HISTORY. 



Family, Muricidse. (Lat. Murex, the purple shell-fish.) 



Tribulus (Lat. a Thistle), the Thorny Woodcock. 



The beautiful THORNY WOODCOCK, sometimes called by the 

 name of Terms' comb, is an excellent example of the MuricidsB. 

 This elegant shell is an inhabitant of the Indian Ocean. 



Order. . . CYCLOBRANCHIATA.(Gr. Kv/cAof, a circle ; 



gills.) 

 Family , . Patellidse. (Lat. Patella, a Porringer.) 



Vulgata (Lat. made common), the Limpet. 



The LIMPETS are spread over eveiy latitude, except the 

 Arctic regions. The common Limpet is to be found on every 

 rock and large stone at the sea-side. The variety of its 

 attachment to the rocks is very curious, and well repays a 



