MAZATLAK tTNIVAlVES 351 



Section B. 



Shell large, Phasianelloid, ratlier tliin, coloured ; columella 

 excavated. Animal amphibious ; often found crawling up trees 

 at a considerable distance from the sea ('J)^so?iJ = Melaraphe, 

 pars, S. Sf A. Ad. Gen. vol. i. p. 414: — ?non Melaraphe, 

 Muhlfeldt. When convenience requires the subdivision of 

 Litorina, this group, included by Lam. in Phasianella, will 

 probably be found natural. 



400. LiTOEiNA PAS CI AT A, Grray. 



Zool. Beech. Voij. p. 139.— S/eJ. in Wiegm. Arch. p. 2^9.— Phil. 

 Abhild. pt. ii. p. 37, pi. 5, f. 1, 2.—Mke. in Zeit.f. Mai. 1850, 

 p. 163, no. 7.—C. B. Ad. Pan. Shells, p. 173, no. 236.— 

 S. Sf A. Ad. Gen. i. 313. 



+ Melaraphe fasciata, R. Sf 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 striae, and is somewhat highly 

 coloured Avith 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 striae of 

 growth. The largest sp, measu.res long. 1*16, long. spir. '64, 

 kit. -95, div. 60". 



Sab. — 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 operciilum ; also a very young shell ; and a loose operculum. 



Genus MODULUS, Gray. 



Phil. Handh. Conch, p. 176.—^. ^ A. Ad. Gen. vol. i. p. 316.— 

 A. Ad. Mon. in Proc. Zool. Soc. 1850, p. 203. 



= Monodonta, Swains. = ^'Lonodontii, pars, Lam. — Shell not 

 pearlj% generally Trochiform, with a deeply grooved colu- 

 mellar tooth. Operculum multispiral. 



