320 WlvSr AKKK AN IMOI-l-HSKS STKAUNS. 



Fwiuily nNIOMD.K. 



(i.ims UNIO lu'tz. 



14. Unio gaboonensis KiiHtor. 



A fow oxaini>l('S. (^mjiu (Mus. No. 125117). 



Speciinciis of tliis species wore dot octcHl in a pond near (liis place. 



Suborder ARCACEA. 

 Family AK'CID.F. 



(it>iuis ARC A l.aiiiarck. 



Section A RCA Lnmnrok. 



15. Area Noise liiiiii(5. 



One ri-iiil valve, lu^acli. Torto (irande (Mas. No. 125;>48). 



'IMiis is a \vid(>ly (listril)Mled lorni. I lia\o eolloeted it on t ho west 

 coast of Florida; it is found on the Atlantic coast of North America as 

 far noith as Hatteras; it ()<'curs in tlu> ['"lorida Keys, the West Indies, 

 the lieiniudas, Caitha^ona, and probably throuiihont the Aiitillean- 

 (.'aribboaii region, as well as in Furope. 



16. Area tetragoiia I'oli. 

 f =^ A naviciiliiris Urnfjiiicic. 

 Porto (Jrande (Mns. No. 125352); Ascension Island (125402). 

 A curions and variable form, otVorinu extraordinaiy inducements to 

 manufacturers of species. Two of the examples are from the latter 

 locality. 



Section BARBAIIA Gray. 

 17. Area lactea liituio. 



One speeinien (Mas. No. 125t0(>); Ascension Island, 

 Reported also from the I^olynesian Islands. 



StTtion ANADAREA Gray. 

 18. Area holoserica Ixoovc. 



One ri.uhf valv*', beach. Foito (JramU^ (IMus. No. 125351). 

 This widely distributed form also occurs in the Australasian and 

 ludo Pacitic seas. 



Section SCAPHARCA Gray. 

 19. Area rhonibea ]Un\\. 

 Three odd valves, b(>ach. Porto (irande (IMus. No. 125340). 



Section SENIMA Gray. 



20. Area senilis l.inno. 



