MAZATLAN UNIVALVES 249 
Hab.—Mazatlan ; 1 sp. off Spondylus ; Z’pool Col. 
Tablet 1165 contains the specimen. 
315. PP Liotra C-B-ADAMSII, 2. s. 
2? L. t. tenuissimd, diaphand, alba; turritd, anfractibus ii. 
tumentibus, swperne subangulatis ; liris radiantibus (in anfr. ult. 
xxil.) & lirulis spiralibus circiter vii. nodulosis elegantissiime 
cancellatis ; anfr. primo et dimidio levibus, tumentibus ; liris 
vadiantibus in bast evanescentibus ; umbilico parvo ; apertura 
subcirculari, peritremati continuo, ab anfr. penult. vie inter- 
rupto. 
Although this is clearly a young shell, its characters are so 
well marked and distinct from any other known Mazatlan 
species, that it has been thought best to preserve a remem- 
brance of its beauty in connexion with the name of the most 
accurate and deeply lamented Prof. C. B. Adams. It has the 
texture of Vitrinella, but is distinguished by its turrited form, 
and by the large size and short length of its apical portion, 
which occupies a whirl and a half, instead of three minute 
whirls as is customary in that genus. The rest of the shell is 
beautifully decussated by radiating lire, obsolete on the base, 
knotted by revolving lirule, three of which appear on the base. 
Both labrum and labrum are extremely thin. It may possibly 
belong to Rissoide, Long. ‘024, lat. °022, div. 70°. 
Hab.—Mazatlan ; 1 young sp. off Spondylus; L’pool Col. 
Tablet 1166 contains the specimen. 
316. ? Liotra —————,, sp. ind. 
Tablet 1167 contains a fragment of a somewhat elevated 
shell, with the apex flattened. The first whirl is large and 
smooth asin ?? L. C-B-Adamsii; but the sculpture is extremely 
strong, with stout transverse tubercular ridges and spiral 
decussating lire. It is distinguished from Chrysallida by the 
flat, dextral apex. 
Hab.—Mazatlan ; 1 sp. off Spondylus: L’pool Col. 
