17. Berthella agassizi (MacFarland, 1909) (Fig. 3B)

Material examined: Praia de Santa Rita, Extremoz, 11.III.2009, one specimen, 11 mm (body length), leg. V. Padula (MZSP 97047). Praia de Pirambúzios (mangrove), Nísia Floresta, 13.III.2009, two specimens, 6-9 mm (body length), leg. V. Padula (MZSP 97066; GEEFAA 269). Praia de Baia Formosa, Baia Formosa, 04.VI.2009, two specimens, 13-15 mm (body length), leg. M. Delgado (MZSP 97067; GEEFAA 333); Praia de Pitangui, Extremoz, 20.I.2019, one specimen, 10 mm (body length), leg. M. Delgado (GEEFAA 1309) .

Description: Oval body, up to 25 mm in length. Pinkbrownish coloration with numerous white spots on the oval-shaped notum. Whitish-grayish coloration mid-dorsally due to visceral mass under the internal shell. Presence of a sub-trapezoidal veil, one pair of retractile, lobulated rhinophores. Gills in the right side of the body. Muscular foot projected posteriorly, but covered by the notum.

Geographic distribution: Eastern Pacific: Mexico (Gosliner & Bertsch, 1988); Western Atlantic: Bahamas, Belize, Bermuda, Colombia, CuraÇao, Brazil (Alagoas, Espírito Santo, Pernambuco, Rio de Janeiro, Rio Grande do Norte, São Paulo and Santa Catarina) (MacFarland, 1909; García et al., 2008; Padula et al., 2012; Alvim & Pimenta, 2015).