250 MAZATLAN TrNIVALYES 



Genus GLOBULUS, Selnm. 



Schumacher, Essai Sfc. 1817, no. 23 ; (non Sow.). — Phil. Handb. 



Conch, p. 208. 

 Eotella, Lam. 1822, et aiict. 

 Umbonium, Link; A. Ad. Mon. in Proc. Zool. Soc. 1853, 



p. 187 -.—JI. Sf A. Ad. Gen. vol. i, p. 407. 

 Pitonellus, Montf. 

 Helicina, (Lam. a prima mauu) Gi'ay in Proc. Zool. Soc. 



1847, p. 145. 



317. ? Globulus tumens, n. s. 



1 Gr. t. glohosa, solidiuscula, alba, subniiente ; spird planatd, 

 depressa, anjractihus iv. suturd haud impressd ; striulis spira- 

 libu.1 subobsoletis tenuissime ornatd ; callositate valde tumente, 

 Irientem partem basis teqente, sidw^d impressd, umbilieum 

 tegente, in parietem et intus suturam spiralem ascendente, juxta 

 labium vix planatmn ; aperturd intus rotundatd, labro in 

 spiram ascendente. 



This species is intermediate between tlie typical Globuli and 

 the Ethalifp. In the faint sculpture and slight planing off of 

 the callosity, it presents the characters of the latter genus ; 

 in the large swelling growth of the callus, which appears glossy 

 over the whole surface, and covers the body whirl within the 

 mouth, running up to the suture, it is a true Globulus. Two 

 older specimens were found, sufficiently' agreeing in other 

 respects, but displaying a gi'oove in the callus near the base of 

 the columella, exactly in the same place, which is remarkable 

 if accidental. They are both however worn specimens. If it 

 should prove a constant character, they may take the name 

 of "G. sulcatus, t. callo basim versus subprofimde sulcato." 

 Long. -013, lat. "038 by -033, div. IGO". 



Hub. — Mazatlan ; 3 sp. off Chama and Spondylus ; L'pool Col. 



Tablet 1168 contains the fresh specimen, and one of the form 

 G. sidcatus. 



SUBGENUS ETHALIA, S. Sf A. Ad. 



Gen. vol. i. p. 409 -.—Proc. Zool. Soc. 1853 (Mon. Uinb.) p. 189. 



A small group of Mazatlan shells, of the general aspect of 

 Vitriuellaj, and agreeing with Globulus in having a callous base. 



