38 PERSICULA. 



M. DE BURGHS, A. Adams. PI. 11, fig. 24. 



Transparent white, with larger and smaller chestnut spots in 

 alternate rows. Length, -4-'5 inch. 



N. W. Coast of Australia. 



I have before me specimens of a pure white variety, from 

 Nicol Bay, communicated by John Brazier, Esq. 



M. PULCHELLA, Kiener. PL 11, fig. 25. 



Yellowish white, with zig-zag longitudinal series of chestnut 

 spots and lines, and usually two darker revolving series. 



Length, -35-*4 inch. 



Sydney, Australia (Authors); Ceylon (Nevill). 



M. PHRYGIA, Sowb. PI. 11, fig. 26. 



Shell gibbous ; yellowish, with zig-zag series of chestnut spots 

 and lines, and two or three revolving series of darker color. 



Length, -3-'4 inch. 



Acapulco and Gulf of California. 



Marked like M. pulchella, but not so cylindrical in form. It 

 is the M. guttata of Swains., not Dillw.-, and M. Swainsoniana, 

 Petit. 



M. FRUMENTUM, Sowb. PI. 11, fig. 27. 



Form and pattern of coloring very like M. phrygia, but the 

 shell is slightly more cylindrical, and the zig-zags are usually 

 much closer ; the heavier coloring forming the bands, curves in 

 an opposite direction. Length, -25-'35 inch. 



Coast of Ecuador (Redfield); W, Coast of South 



America (Weinkauff). 



M. CATENATA, Mont. PI. 11, figs. 28, 29. 



Shell whitish, with chain-like revolving series of chestnut and 

 milk-white spots. Length, -15--25 inch. 



West Indies, W. Coast of N. America. 



M. alba, C. B. Adams, is probably founded on a worn specimen 

 of this species. Mr. W. H. Dall records the occurrence of M. 

 catenata on the West Coast of America at Panama, Cape St. 

 Lucas, and also at the Galapagos Is. ' There are six to ten of the 

 revolving chains of spots, and frequently the chestnut-colored 

 ones are not apparent, so that the shell is thin, whitish, trans- 

 lucent, with milk-white spots. 



