524 MAZATLAN UNIVALVES 
Tablet 2501 contains a magnificent, uncleaned specimen, 
with operculum.—2502, an operculum differing from the rest 
in having the inner edge more truncate, and the corrugations 
irregular. It may be an abnormal form of this species, or 
may belong to Ph. bicolor. 
669. PHytiLonotvs Bicotor, Val. 
Murex bicolor, Val. in Humb. & Bonpl. Ree. Obs. p. 301.— 
five. Conch. Ic. pl. 11, f. 44.—Kien. Icon. Conch. p. 67, no. 48, 
pl. 28, f. 1.—Sow. Conch. Lil. no. 91.—Mke. in Zeit. f. Mal. 
1850, p. 187, no. 70. 
Murex erythrostomus, Swains. Zool Ill. series ii. vol. ii. pl. 73.— 
Desh. in Lam, An. s. Vert. vol. ix. p- 610, no. 81. 
Murex regius, Schub. & Wagn. m Chemn. Suppl. vol. xii. 
p. 133, pl. 230, f. 4066-7, (non Swains.) 
Var.=Murex hippocastanum Pil. Ic. pl. 1, f. 2, (teste Rve. 
non Linn.) 
Vide Kust. Mart. pl. 5, f. 1, 2. 
Shell closely resembling M. imperialis, Swains. (Lam. An. s: 
Vert. vol. ix. p. 611, no. 82,) ; with 6 varices, each having a pos- 
terior canal, an adjacent open spine, and about 8 others behind 
the labrum, which is deeply denticulated. Between each 
varix isa false varix with about 4 spiny tubercles. Surface 
foliated behind the posterior canal. Outside covered with 
extremely fine spiral strie, decussated by equally fine lamine 
of growth which are undulated by the strie. Labium expanded, 
raised, and, with the mouth, pink. Siphonal canal greaily 
bent, nearly covered, scarcely leaving an umbilicus. Long. 5'8, 
long. spir. 1°6, lat. 4°, div. 100°. 
Hab.— Gulf of California; on mud banks at low water; Lieut. 
Babb.—Acapulco, Humboldt & Bonpland.—Mazatlan ; very 
rare; L’pool & Havre Coll. 
Tablet 2503 contains one of the three sp. which alone were 
found in the L’pool Col. Several specimens in the London 
shops were probably from the Havre Col. 
670.’ PHYLLONOTUS REGIUS, Swains. 
Murex regius, Swains. in Bligh Cat. p. 16, no. 201, 806 (non 
deser.)— Wood, Ind. Test. Suppl. pl. 5, f£.13.—Sow. Conch. 
Til. Cat. no. 89.—Kien. Icon. Conch. p. 63, pl. 42, 438, f. 1.— 
