MURKX. Id 



degrees of spinous di'velopinent of this species. 31. Troi^cheli, 

 Lisclike (lig. Ill) is founded on a very large, stout specimen, 

 which, wlien perfect, must have been nearly t inches in length. I 

 place it here ; yet it has affinities with M. Irihiiliis, particularly 

 in its solid, stout appearance. 



M. soBRiNis, A. Ad. Suppl. ri., tig. y.H\. 



The seven whorls are convex, longitudinally nodosely plicate 

 and transverse!}' Urate, very spinj^ ; the long, straight canal is 

 spiny; the body whorl has two reddish-ltrown bands. 



Length, 36 mill. 



Japan, 39 to 35 finn. 



M. RARI8PINA, Lam. PI. 10, lig. 115 ; PI. 11, fig. 119. 



The best character of this form is found in the great develop- 

 ment of the superior spines on the body whorl. The lower part 

 of the canal is smooth, and the upper part litis oidy a few short 



spines. Length, 3-5 inches. 



Indian 0. 

 M. AfiiuJancnf^is, 8owb., (tig. llDj 1 believe to be a depauperate 

 state of this species. Messrs. Kiener & Reeve consider M. 

 forniosii}<, Sowb., (fig. 115), a synonym, and as the former cites 

 rariapuui in the Lamarckian collection, I am disposed to agree 

 with them. Mr. Sowerby figures aii entirely different shell for 

 rarispina — a shell which appears to me to he a 31. trtbulus. 



M. BREVISPINA, Lam. PI. 11, fig.121 ; PI. 24, fig. 209. 



The spines are very short, scarce!}' longer than the tubercles 

 which, in double series, two in each, divide the space between the 

 varices ; these tubercles define a somewhat flattened periphery. 



Length, 3 inches. 



Bed Sea, Ind. 0., So. Africa, N. Australia, 6-11 fms. 



31. aenilis, Jousseaume, (fig. 209), can scarcely' be regarded as 

 more than a thin variety of this species, in which the spines are 

 better developed. It is said to inhabit the Philippine seas. 



M. CONCINNUS, Reeve. PI. 11, fig. 122. 



The colored, narrow revolving lines, and short, direct spines 

 give this shell a very lively appearance. Only a single specimen 

 is known (Metcalfe Museum). It can scarcely be regarded as a 

 well-established species because these narrow bands are found in 



