NERITINA. . 469 
1. Neritina latissima. 
Neritina latissima, Broderip, P. Z. S. 1832, p. 200’; Sowerby, Conch. Illustr., Neritina, sp. no. 29, 
figg. 3, 16 (before 1838)*; Thes. Conch. ii. p. 519, t. 104. fig. 172%; Deshayes, in 
Lamarck’s Hist. Nat. Anim. sans Vert. viii. p- 581*; Récluz, Journ. de Conch. i. p. 146 
(1850) °; Reeve, Conch. Icon. ix., Neritina, t. 3. fig. 13°; v. Mart. in Martini & Chemnitz, 
Syst. Conch.-Cab. ed. 2, Neritina, p. 72, t. 1. figg. 6, 77. 
Very conspicuous from the wing-like production of both sides of the shell, above and below, by which the 
height of the shell, taken from the axis of the whorls, is rendered greater than the diameter across it. 
Hab. S.W. Nicaragua: Realejo, in a river, adhering to rocks (Cuming !*). 
S.W. Costa Rica: Rio Grande de Pirrés (Pittier, Febr. 1892); Rio Punta Mala, in 
fresh water, 20 metres above the sea (P2ttier, April 1892). 
Var. globosa. 
Neritina globosa, Broderip, P.Z.S. 1832, p. 201°; Sowerby, Conch. Illustr. sp. no. 31, fig. 12° ; 
Deshayes, in Lamarck’s Hist. Nat. Anim. sans Vert. vill. p. 582 °°. 
Neritina intermedia, var., Sowerby, Thes. Conch. ii. p. 519, t. 104. figg. 174, 175"; Reeve, 
loc. cit. t. 3. fig. 14. 
Neritina intermedia, var. dilatata, Récluz, Journ. de Conch. i. p. 146”. 
Neritina latissima, var. 6. globosa, v. Mart. loc. cit. p. 72, t. 7. figg. 15, 16™. 
Upper wing less developed, lower wanting. Height and transverse diameter about equal. 
Hab. S.W. Costa Rica: Gulf of Nicoya (Cuming }8); Rio Grande de Terraba and Rio 
Punta Mala, in fresh water, 50 and 20 metres above the sea (Pittier). 
S. Panama: Rio Chiriqui, in a river (Cuming ®1°); on an island in the Bay of 
Montijo, in a stream * (Cuming !). | 
Var. intermedia. 
Neritina intermedia, Sowerby, P.Z.S. 1832, p. 201%; Conch. Ilustr. sp. no. 33, fig. 7” 
Deshayes, loc. cit. p. 5837; Récluz, Journ. de Conch. i. p. 146°; Tate, Amer. Journ. of 
Conch. v. p. 153”. 
No wing-like projection, neither above nor below. 
Hab. S.W. Nicaraeva: Realejo (Cuming '*). 
SW. Costa Rica: San Lucas, in the Gulf of Nicoya, a variety (Cuming! "). 
S. Panama: on an island in the Bay of Montijo, in a stream, abundantly on stones 
(Cuming 517); Panama city, on the bottom of a freshwater stream, by the 
railway-terminus (Tate }*). 
Ecuapor: Guayaquil (Wolf & Boetzes). 
Perv (Tschudi). 
Various localities upon the Pacific slope or coast are cited for this variety of 
* Reeve '* gives the locality &c. as “‘ Island of Lions, Bay of Montijo, in a mountain-stream.” I am unable 
to find such a place on the maps, and there cannot be mountains on any of the small islands in the Bay of 
that name. 
