588 MOLLUSCA. 
which, judging from the description and figure, I cannot believe. The type was found 
on the rocks at half-tide level. 
Littorina scabra (L.) [Rumph, Amb. Rariteitkamer, t. 29. fig. Y (1705); Philippi, 
Abbild. neuer Conch. ii. t. 5. figg. 38-5 ; v. Martens, in M. Weber’s Zool. Ergebnisse Reise 
Niederl. Indien, iv. p. 194], a characteristic Malayan form, is quoted by Tryon (Manual 
of Conch. ix. p. 245) as occurring also at Mazatlan. I cannot find any reliable record 
of this species, or of the nearly allied L. angulifera, Lam., from the West Coast of 
America. 
Tectarius coronatus, Valenciennes, in Humboldt’s Obs. Zool. ii. p. 271, said to have 
been found in the port of Acapulco, is, according to the description, evidently 
synonymous with Littorina (TLectus) bullata, Martyn, = papillosa, Lam. (Philippi, 
Abbild. neuer Conch. ii. t. 2. figg. 2,7; Reeve, Conch. Icon. x., Litorina, t. i. fig. 1), 
a species living on the coast of the Philippines (Jagor, in Mus. Berol.), and also in the 
Indian seas. Nanina ovum, another species described in Alex. v. Humboldt’s work, 
was also supposed at one time to be Mexican; both shells were, no doubt, imported 
from Manila. 
The freshwater species of the following genera have already been dealt with in the 
preceding pages :— 
NERITINA. 
For the characters of this genus, its subgenera, and the comparative table of the 
species, see anted, pp. 465-468 ; we have to deal here with the submarine or salt- 
water forms only, which come under the heading ‘‘c. Species submarine ” * :— 
7. Neritina virginea. 
Buonanni, Ricreazione dell’ occhio, etc., pars iii. figg. 197, 198, 200, 203, 204, 205 (1681) °. 
Nerita quasi squamosus, Lister, Hist. Conch. iii. t. 606. figg. 82, 35-39”. 
Nerita virginea, Linn. Syst. Nat. ed. 10, p. 778°; Hanley, in Linn. Conch. p. 402%. 
Neritina virginea, Lamarck, Hist. Nat. des Anim. sans Vert. éd. 1, vi. 2, p. 187 (1822) °; éd. 2, par 
Deshayes, viii. p. 516°; d’Orbigny, in Sagra’s Hist. fis. polit. y nat. de Cuba, Mol. p. 1747; 
Voy. Am, mér. v. p. 406, t. 56. fige. 1-8 (living animal) °; v. Mart. in Malak. Blatt. xii. p. 62 
(1865) °; ibid. in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Neritina, p. 122, t. 14. 
figg. 18-17"; Tate, Amer. Journ. of Conch. v. p. 153 (1870) ''; Strebel, Beitr. Mex. 
Land- und Siissw.-Conch. i. p. 62, t. 1. fig. 40; Troschel, Gebiss d. Schnecken, ii. p. 181, 
t. 16. fig. 19 (radula)”; Pilsbry, Nautilus, xiii. p. 189 ™. 
Neritina eleguntissima, Hartmann, Gastropoden d. Schweiz, p. 198, tt. 77, 78 ©. 
Nerite fluviatiles Indie occidentalis, Chemnitz, Syst. Conch.-Cab. ix. p. 72, t. 124. figg. 1088 a—1™. 
Hab. E, Mexico: Isla verde, near Vera Cruz, a coral island in a pool formed by rain- 
water and filled with alge, copiously (Strebel 12); Vera Cruz (Friedel °). 
S.E. Mexico: Pueblo “* La Ceiba” in ‘Tabasco (Rovirosa 14), 
Yucatan: Laguna de Terminos (Morelet, Strebel 12), 
* See p. 555, 
