190 MOLLUSCA. 
11. Ortalichus ponderosus. (Tab. XI. figg. 9, 10, 10 a.) 
Orthalicus ponderosus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. pp. 35, 36, t. 7. figg. 1, 5-8". 
Orthalicus boucardi-ponderosus, Strebel, ibid. p. 39, t. 1. figg. 4a, b (corrected on p. 182 to 
ponderosus-boucardt) *. 
Orthalicus lividus-princeps, Strebel, ibid. p. 31, t. 1. fig. 6°. 
Hab. W. Mexico: San Blas, State of Jalisco (Wessel, in coll. Dunker); Tepic 
(Richardson) ; West Mexico (Wessel *); Culata, near Manzanillo, State of Colima 
(Lloyd, June 1889); Dos Arroyos, 25 miles N.E. of Acapulco, State of Guerrero, 
at an elevation of 1000 feet above the sea (H. H. Smith). 
S.W. Mrxico: Tehuantepec (Stredel 2). 
Strebel ! did not know the exact locality of the specimens which he described; but 
the collection of Dunker and the materials placed in my hands by Messrs. Godman. 
and Salvin show that this remarkable species belongs to the western coast of Mexico, 
where it is somewhat widely distributed. In the Berlin Museum there is a shell much 
resembling this species received from Dr. H. Dohrn, and said to have been found at 
Juraty on the Amazon river. A similar shell is also stated to have been found in 
Colombia, in the holes of trees, by Wallis (see Mousson, Malak. Blatt. 1869, p. 179). 
The apex is generally dark chestnut-brown, but in some apparently fresh specimens 
it is pale. The broad black lip inside the aperture is to be seen in young specimens 
measuring 45 millim. in length. The aperture is all round of a shining black, only 
the columellar edge itself is pinkish-white, with the base of the aperture black, the 
white forming a more or less narrow streak on the columella. The general colour of 
the shell is yellowish-brown ; the dark streaks are more distinct on the upper whorls, 
confluent and often very indistinct on the last. 
12. Ortalichus melanochilus. (Tab. X1. figg. 6, 7, 7a.) 
Bulimus melanochilus, Valenc. in Humboldt & Bonpland’s Recueil. d’Observ. Zool. ii. p. 246, t. 55. 
figg. 3a, b (1833) °. 
Orthalicus melanochilus (Valenc.), v. Mart. in Malak. Blatt. xii. pp. 45, 70 (1865)*; Binney & 
Bland, Terr. air-breath. Moll. N. Am. v. p. 410, fig. 287°; Man. of Am. Land-Shells, 
p. 440, fig. 4844. 
Bulimus zebra, var. E, Pfr. Monogr. Helic. Vivent. ii. p. 144°. 
Orthalicus zebra (Miill.), Carpenter, Cat. Mazatlan Shells, pp. 176, 177, Tabl. 805, 806 ®; Binney, 
Land and Freshw. Shells of N. Am. i. p. 217, fig. 371, p. 215, fig. 867 (jaw) ’. 
Hab. N.W. Mexico: Tres Marias Islands (orrer, Richardson); Mazatlan (Reigen °) ; 
Sierra Madre (? Tonala in Jalisco *) (Xantus’). 
Valenciennes ! gives simply “ Nouvelle Espagne,” that is to say Mexico and Central 
* Given as “ Tomla Talasco.” 
