!2Q 



MALACOLOGICAL NOTES.* 



By E. R. SYKES, B.A., F.L.S. 



5. The genus Rhodea. 



The genus Rhodea has been reviewed three times, namely by Crosse 

 (i), Da Costa (2), and Jousseaume (4), and though the last two have 

 added but little to our knowledge save in the description of new 

 forms, it may be convenient to briefly list the species now known. 

 Dr. Jousseaume appears to have worked in ignorance of Mr. Da 

 Costa's paper. 



The genus was founded by H. and A. Adams in February, 1855, 

 (Genera Rec. Moll, vol. ii, p. 135), as a section of CoJumna, to contain 

 the single known species R. pfeifferi, Crosse, under its then name of 

 Achatina californica, Pfr. It was raised to the rank of a genus by 

 Mousson (5) in 1873, when describing a second species, R. gigantea. 

 A third species was added by Dohrn (3) in 1875; two by Mr. Da 

 Costa (2) in 1899, and three by Dr. Jousseaume (4) in 1900. 



Nothing seems to have been stated as to the life-history or 

 anatomy, save the note by Dohrn that R. icaUisiatia is ovoviviparous, 

 and the record by Mr. Da Costa of the finding of ten embryonic 

 shells in R. (/ir/antea. The fossil history ecjually appears to need 

 study. I have not repeated all the references given by Crosse (i), 

 but have only referred to the original diagnosis, and to that paper. 

 We may note the description by de Morgan of a genus Rlwdina from 

 Perak, said to be allied to Rhodea. 



LIST OF SPECIES. 



Rhodea aequatorica, Da Costa. 



R. aequatorica, Da Costa (2), p. 305, fig. 



Hab. — Ecuador. 

 Rhodea cousini, Jousseaume. 



R. coudni, Jousseaume (4), p. 36, pi. i, fig. 15. 



Hab. — Ecuador. 

 Rhodea crosseana. Da Costa. 



R. crosseana, Da Costa (2), p. 305, fig. 



Hab. — U. S. of Colombia. 

 Rhodea equatouensis, Jousseaume. 



R. equaturensis, Jousseaume (4), p. 37, pi. i, fig. 17. 



* See ante, vol. vii, p. 164. 



