MITRA. 127 



M. EFFUSA, Swainson. PI. 37, fig. 109. 



Uniform dark chestnut, encircled with fine raised ridges. 



Length, 1-25 inches, 



Guacomayo, Central America ; Oallapagos Is. 



M. TESTACEA, Swainson. PL 37, figs. 110-112. 



Chestnut-brown, with obsolete or deep-cut revolving lines at 

 the base. Length, 1-25 inches. 



Kingsmill, Cook's, Society and Paumotus Is. 



That M. Bulimoides, Reeve (fig. Ill), and M. badia, Reeve 

 (fig. 112), are both synonyms, I have little doubt; they are 

 described without locality. 



M. RHODIA, Reeve. PL 37, fig. 114. 



Smooth, polished, with very fine, obsolete spiral striae, 

 becoming more distinct towards the base ; dark olive or 



chestnut-brown. Length, 1 inch. 



Habitat unknown. 



More narrowly acuminated than the preceding species ; of 

 which nevertheless it may be a variety. 



M. CASTANEA, A. Ad. PL 37, fig. 115. 



Chestnut-color ; transversely punctate-striate. Length, 9 inch. 



Habitat unknown. 



" This species most nearly resembles M. badia, Reeve, but the 

 whorls are rounded, and it differs in other particulars." The 

 white spots on Sowerby's figure (the onty illustration of the 

 species) are not described : do they represent punctations ? 



M. MELANIANA, Lam. PL 37, figs. 118, 119. 



Dark olive-brown, or dark chestnut, smooth and polished, 

 usually with small white spots below the suture. 



Length, 2-2'5 inches. 



Port Jackson, Australia. 



Sowerby and Reeve call this species M. nigra, Chemn., but 

 the figures in that scarcely quotable author do not indicate this 

 shell. Reeve gives Isl. of Annaa, Pacific Ocean, as locality, and 

 Lamarck quotes Guinea, India and Greenland ! all errors. 

 Something like M. Chinensis, Gray, but differs in its more flat- 

 tened whorls. M. digna, A. Ad. (fig. 119), is synonymous. 



