OF CONCHOLOGY. 



173 



3. M, MACULOSA, Kiener, Coq. Viv. Marg. p. 26, pi. 9, f. 40, 



1834. 

 M. muralis. Hinds, Proc. Lond. Zool. Soc. 1844, p. 76. 

 Sowb. Thes. Conch, i, 394, pi. 78, f. 217, 1846. Reeve. 

 Conch. Icon. pi. 15, f. 69, 1865. 



Hah. Caribbean Province ; Bahamas to' Curagoa. Frequent" 

 ly found among the small shells brought from the Bahamas. I"^ 

 is hardly diaplianous, as Kiener calls it, but much nearer to i*^ 

 than is the following species. 



4. M. CALCULUS, Redfield. 



M. guttata^ Sowb., (not Swains.) Syn. exd. Thes. Conch, i, 



394, pi. 78, f. 208, 209, 210, 1846. 

 M. maculosa. Reeve, (not Kien.) Syn. excl. Conch. Icon. pi. 



15, f. 65, a, b, 1865. 



Shell oval, solid, polished, yellowish white, transversely tessel- 

 ated with milk white spots and yellow guttules which deepen in 

 color towards the left. Spire concealed. Lip not reflected, 

 finely toothed or striated on inner margin. Columella shows 

 from six to eight plaits, of which the upper ones are almost ob- 

 solete, while the lowest but one, is broad and stout. 



Length, 11 millemetres. Breadth, 8 millemetres. 



Hah. St. Vincents, Sowb., Reeve; Grenadines, Rawson. 



This species is remarbable for its solidity, a^d approaches in 

 type the group to which belong 31. interrupte-lineata, M. ohesa 

 and 31. tcssellata. It differs from 31. inaeidosa, in its less elon- 

 gated form and greater solidity and in the oval rather than square 

 form of its guttules, which are not so plainly grouped into darker 

 bands as in 31, maculosa. Sowerby's figure above quoted well 

 represents the species. 



From 31. ph^ygia it is distinguished by its greater size and 

 solidity and by its markings, which in 31. plirygia assume the 

 character of dark brown rings more or less complete, as is well 

 shown in vSwainson's magnified figure. Swainson's shell was 

 only 8 millemetres in length ; my own specimens of 31. j)]irygia 

 measure but 7. Full grown specimens of 31. maculosa measure 

 12 millemetres in length and 6 in breadth. Perfect and mature 

 shells of both 31. maculosa and 31. calculus show the lip to be 

 striate or denticulate within, a feature noticed by Hinds, but over- 

 looked by Kiener and Reeve. 



The key to the confusion which has existed in regard to these 

 species is found in the early erroneous assumption that Kiener's 

 species was identical with Swainson's. This being corrected, the 

 synonymy readily resolves into truth. 



