MAZATLAN UNIVALVES 505 



carinated. The shape of this is like Anachis, &c. ; but in all 

 the Columbelloid shells examined, the nucleus is regular. 

 Hob Mazatlan ; 1 young sp. off Spondylus ; L'pool Col. 



GENUS COMINELLA, Gray. 



If. fy A. Ad. Gen. vol. i. p. 110. Shell Buccinoid. Operculum 

 Muricoid. 



644. PCoMiNELLA , sp. ind. 



Tablet 2417 contains a small smooth yellow shell, of regular 

 form. The first four whirls have a different shade of colour 

 and may be nuclear. 

 Hob.- Mazatlan ; 1 young sp. off Spondylus ; L'pool Col. 



GENUS ANACHIS, H. $ A. Ad. 



Gen. vol. i. p. 184 : (as Subgenus of Columbella.) 



Testa ColumbellcB similis, spird elevatd, anfractibus liratis ; 

 aperturd subquadratd ; labro intus dentato, labio crenato. 

 Operculo elongato, unguiformi, nucleo terminali. 

 Columbella, pars, auct. 



These shells, which form a very natural group of the old 

 genus Columbella, are distinguished essentially by the opercu- 

 lum, which has closer analogies with Pisania. The operculum 

 of Columbella fulgurans, which is a smooth species with a 

 twisted mouth, is figured by Messrs. Adams, pi. 19, f. 7 5, c 9 

 as resembling that of Anachis. The opercula of Columbelloid 

 shells have hitherto received so little attention that Dr. Gould 

 in his great work on the U. S. Expl. Exp. Shells, p. 270, states 

 that they have none. 



645. ANACHIS SCALAEINA, Sow. 



Columbella scalarina, Sow. in Proc. Zool. Soc. 1832, p. 116 : 



Thes. Conch, p. 130, no. 55, pi. 39, f. 118. Desk, in Lam. 



An. s. Vert. vol. x. p. 288, no. 4&.CUnu Conch. III. pi. 25, 



f. 34, (male.) 

 (Columbella) Anachis scalarina, H. fy A. Ad. Gen. i. 184. 



Two young shells and one adult specimen are referred to 

 this species by Mr, Cuming. Being in perfect condition, the 

 April, 1857. v v 



