MAZATLAN UNIVALVES 175 



Dr. Gray unites Oleacina, Glaiidina and Halia under the 

 former name, (B. M. Cat. Pulm. p. 13 ;) H & A. Adams con- 

 sider them distinct : Gen. vol. ii. p. 107. Ordinary students 

 have no power of ascertaining whether generic names given 

 with an early date are accompanied by a diagnosis, and there- 

 fore of authority, or whether they are only names which have 

 been attached to certain species, and not entitled to take pre- 

 cedence of a regularly defined genus. The animal of Glandina 

 is said to be carnivorous, and to resemble Testacellas with the 

 spiral part developed. 



230. GLANDINA ALBEESI, Pfr. 



Achatina Albersi (Glandina) Pferf. in Proc. Zool. Soc. 1854, 



p. 295. 



A very few specimens of this unpretending species were 

 found among the Physae. It appears to take the place of G. 

 rosea, found lower down the peninsula. The shape is extremely 

 variable, being sometimes elongated like G. turris ; sometimes 

 very much swollen, with a short spire. A turreted specimen 

 measures . . . long. 1*2, long. spir. '59, lot. '5. 



A swollen sp. . . 1', ,, '42, .5. 



Sab. Mazatlan ; extremely rare ; L'pool Col. 



Tablet 794 contains 3 sp. : one turreted, one swollen, one 

 curiously mended after fracture. 



231. GLANDINA TUEEIS, Pfr. 



Achatina turris (Glandina) Pfr. Symb. iii. p. 91, no. 126 : 



Hon. Helic. ii. 28S.Rve. Conch. Ic. pi. 13, f. 45. Desk. I. c. 



186, no. 51, pi. 134, f. 1, 2B. M. Cat. Pulm. pt. i. p. 25, no. 29. 

 =G. Albersi, var. turrita, P. P. C., Cat. Prov. 

 Acicula turris, H. fy A. Ad. Gen. vol. ii. p. 109. 



This species is kept separate provisionally on the authority 

 of Dr. Pfeiffer. As only one specimen was found in the Maz- 

 atlan collection, it would not be fair to decide without further 

 evidence. It appears to differ from the elongated var. of G. 

 Albersi, simply in the still greater elongation, greater arcuation 

 of the columella, and greater fineness of the striae. But all 

 these characters are variable in the other species. Long. 1'2; 

 long. spir. '61, lat. '48. 

 Sab. Mexico, Liebmann. Mazatlan ; 1 sp. among Physae ; 



L'pool Col. 



Tablet 795 contains the specimen. 



