2 50 Shell Life 



is very similar to the last, but little more than a 

 quarter of an inch long and with only two of the 

 spiral bands. Most of these Eulimas attach them- 

 selves to the shells of bivalves, the opercula of 

 gasteropods, or to the interior and exterior of the Sea 

 Cucumbers {Holotliuria). 



The Urchin Snail (Stilifer turtoni), of which we 

 have but one species, agrees with Eulima in having 

 no teeth. It is, however, housed in a shell of 

 different shape, the body - whorl being large and 

 broad, the greater part of the spire above being so 

 slender and cylindrical that it has suggested the 

 Greek stylus. It differs from Euliona again in 

 having no operculum. The head of the animal is 

 snout-like and ends in a suctorial mouth. The 

 tentacles are cylindrical, and the mantle-edges turn 

 up and overlap the margins of the shell. This 

 creature is found only on and among the spines of 

 Sea Urchins, where it appears to feed upon the 

 excreta of the Ecldnis. 



The Pyramid-shells (Odostoniia) are well repre- 

 sented on our shores by a score of species. The 

 shells are all small, conical or awl-shaped, 

 smooth or spirally grooved, with the apex 

 coiled the reverse way (sinistral) to the 

 Conical greater part of the shell, and the mouth with 

 ^shTii ' ^ tooth-like projection on the inner lip — hence 

 the name Odostomia = tooth - mouth. The 

 animal is very like Eulima. The proboscis is only 

 protruded for the purpose of feeding, which appears 

 to be at the expense of the jelly-like polyps and 

 sponges whose softer slime-like portions they can 

 obtain by suction. Some of them appear to subsist 



