38 AXEL A. OLSSON 



Balcones Point near Negritos but has been driven away by being con- 

 stantly shot at by trigger happy sportsmen. Among fishes, the Black Marlin 

 (Makaina marlina) and the Sailfish (Istio-phorus greyi) do not normally 

 extend south of this region. 



Below is given a list of the principal species of mollusks of the Paita 

 Buffer Zone. The species marked with an asterisk (*) are southern forms 

 from the Peruvian Province; unmarked species are Panamic, the latter 

 predominating greatly in number. The island of Lobos de Tierra, the largest 

 and most northerly of the guano islands along the coast of Peru and lying 

 about 80 kilometers south of Punta Aguja, although in the middle of the 

 Peruvian stream, has a molluscan fauna similar to that of the Bay of 

 Sechura. For this reason it is considered an outlier of the Paita Buffer Zone. 



Rictaxis venustus (d'Orbigny) Paita, also Mancora 



BuUaria aspersa (A. Adams) Negritos, Paita, Bayovar, Lobos de Tierra, 



also Paracas Peninsula 



Umbractdum ovalis ( Carpenter) Bayovar 



Cancellaria cassidijormis Sowerby — - Negritos 



Caticellaria chrysostoma Sowerby Negritos, Lobos de Tierra 



*Oliva -peruviana Lamarck _ Negritos, Paita, Bayovar, Lobos de Tierra 



OliveUa columellaris Sowerby .„ _ — Negritos, Paita, Bayovar 



*Marginella curta Sowerby „ .Negritos, Paita, Bayovar, Lobos de Tierra 



Mitra swainsoni Broderip Yasila, Paita 



Cantharus (Triumphis) distortus (Gray) _ Lobitos, Paita 



Cantharus vibex B roderip — Lobitos 



Columbella paytensis Lesson Negritos, Paita, Bayovar 



Hexaplex brassica (Lamarck) „ Bayovar, Lobos de Tierra 



Murex squamosus (Broderip) Bayovar, Lobos de Tierra, Paita 



*Concholepas concholepas (Bruguiere) _ Lobos de Tierra 



*Thais chocolata (Duclos) Negritos, Paita, Bayovar, Lobos de Tierra 



Thais haemastoma (Linne) (biserialis Blainville) Negritos, Paita, Bayovar 



Thais callaoensis (Gray) Negritos, Paita, Bayovar, Lobos de Tierra 



Purpura patula pansa Gould Lobos de Tierra 



Fusinus dupetithouarsi (Kiener) Bayovar, Lobos de Tierra 



Fusinus panamensis Dall - ......Lobitos, Bayovar 



Epitonium statuminatum ( Sowerby ) — — Paita 



Cymatium parthenopeum (von Salis) [costatum Born] „ Bayovar, 



Lobos de Tierra 



Cymatium wiegmanni ( Anton ) Bayovar 



Bursa ventricosa (Broderip) — Bayovar, Lobos de Tierra, also Paracas 



Cypraea (Trona) exanthem^a Linne - Lobos de Tierra, Bayovar, Negritos 



Trivia radians (Lamarck) — Negritos, Lobos de Tierra 



Malea ringens (Swainson) .....^Negritos, Paita, Bayovar, Lobos de Tierra 



Ficus decussatus ( Wood ) „ Negritos 



Turritella goniostoma Valenciennes Bayovar, Paita, Negritos, 



Lobos de Tierra 



