MAZATLAN UNIVALVES 407 



lidae, to which family these very different-looking shells seem 

 allied. The animal of Philippia is said however to be a 

 Scutibranch Trochid. 



GENUS TOEINIA, Gray. 



H. fy A. Ad. Gen. vol. i. p. 242. Shell rounded : operculum 

 trochiform, as in Bifrontia. 



484. TOEINIA PVAEIEGATA, Lam. 



Solarium variegaturn, Lam. An. s. Vert. vol. ix. p. 99, no. 6. 

 Trochus perspectiviunculus variegatus, Chem. Conch. Cab. 



vol. v. pi. 173, f. 1708-9. 

 =Euomphalus radiatus, Mice, in Zeit. f. Mai. 1850, p. 170, 



no. 27. 

 Comp. Solarium, sp. ind. c., C. S. Ad. Pan. Shells, p. 190, 



no. 272. 



Menke states that his shell is that of Chemnitz, but is not 

 the Solarium variegatum of Lamarck as Kiener and Deshayes 

 suppose. If the Lamarckian species, which is said to be from 

 N. Zealand, be distinct, the name of Mke. is certainly shorter 

 than that of Chemn. which is adopted however by Dillw. Rec. 

 Sh. p. 783, no. 59. On a very close comparison with one of the 

 Barbadoes species, (supposed to be the Lamarckian shell,) I 

 am unable to detect any specific difference. Mr. Cuming has 

 the same form from Isle Annaa. 



The Mazatlan shell differs from. Torinia areola, Chemn. 

 ( = Solarium tessellatum, Desk, olim ; v. Lam. An. s. Vert. 

 vol. ix. p. 100, no. 8) in having a rounder base, and in not 

 having the first row of granules below the suture white. Of 

 this species, the locality of which was not known by Desk, I 

 have a specimen answering exactly to the description from the 

 W. Indies. The name is given in the Br. Mus. to a specimen 

 sent from California by Lady K. Douglas. The Gulf species 

 has a very rounded outline, with numerous spiral ribs of which 

 generally four appear on the spire. They are rendered granu- 

 lose by strong striae of growth. The umbilicus has two strong 

 granulose spiral keels, which crenulate the subquadrate mouth. 

 The operculum, which was preserved in four of the specimens, 

 is very conical, and has about 10 turns bounded by raised 

 ridges. Colour purplish brown tessellated with light. Hpider- 



