MAZATLAN UNIVALVES ook 
Srotion B. 
Shell large, Phasianelloid, rather thin, coloured ; columella 
excavated. Animal amphibious; often found crawling up trees 
at a considerable distance from the sea (Dyson.) = Melaraphe, 
pars, H. & A. Ad. Gen. vol. i. p. 414:—Pnon Melaraphe, 
Mihifeldt. When convenience requires the subdivision of 
Litorina, this group, included by Lam. in Phasianella, will 
probably be found natural. 
400, LitorIna FASCIATA, Gray. 
Zool. Beech. Voy. p.139.—Sieb. in Wiegm. Arch. p. 209.— Phil. 
Abbild. pt. ii. p. 37, pl. 5, f. 1,2.—Mke. in Zeit. f. Mal. 1850, 
p. 163, no. 7.—C. B. Ad. Pan. Shells, p. 173, no. 236.— 
HI. & A. Ad. Gen. i. 313. 
+ Melaraphe fasciata, H. & A. Ad. Gen. i. 314. 
This very beautiful species, of which but few’ specimens 
were found, is (as Menke remarks) intermediate between 
L. pulchra and L. scabra. The spire is pointed, never eroded. 
When young it has fine spiral striw, and is somewhat highly 
coloured with orange and purplish brown in irregular bands 
or dashes. When adult, it is often nearly smooth, with the 
colour evanescent near the labrum. The operculum is very 
thin, with but few turns, and the nucleus not far from the 
middle. Surface not granulose, with rather coarse strie of 
growth. The largest sp. measures long. 1°16, long. spir. *64, 
lat. °95, div. 60°. 
Hab.—Tumbez, Peru, Cuming.— Panama ; not uncommon, 
with L. varia, on trunks and branches of small trees growing 
between half tide and high water levels; C. B. Adams.— 
Mazatlan; very rare; L’pool Col. 
Tablet 1687 contains the most characteristic specimen, with 
its operculum; alsoa very@oung shell ; and a loose operculum. 
Genus MODULUS, Gray. 
Phil. Handb. Conch. p.176.—H. & A. Ad. Gen. vol. i. p. 316.— 
A. Ad. Mon. in Proc. Zool. Soc. 1850, p. 203. 
= Monodonta, Swains.=Monodonta, pars, Lam.— Shell not 
pearly, generally Trochiform, with a deeply grooved colu- 
mellar tooth. Operculum multispiral. 
