1. 
   slit shell
   (from the article `gastropod`) ...sex cells discharged by way of the right nephridium (kidney); about 3,000 species.Superfamily Zeugobranchia (Pleurotomariacea)Slit shells ...
   Found op http://www.britannica.com/eb/a-z/s/109
   
   
2. 
   Slit-shell
   Slit'-shell' noun (Zoology) Any species of Pleurotomaria , a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical sea...
   Found op http://www.encyclo.co.uk/webster/S/123
   
   
3. 
   slit-shell
   <zoology> Any species of Pleurotomaria, a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?slit-shell
   
   
4. 
   Slit-shell
   • (n.) Any species of Pleurotomaria, a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas.
   Found op http://thinkexist.com/dictionary/meaning/slit-shell/
   
   

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