PSEUDOTROCHUS. 219 



cliam. 34 mm. ; apert. with peristome 33 mm. long, 21 wide 

 (Crosse). 



Island of San Thome, Gulf of Guinea : Roca Agoa Grande 

 (Greeff) ; Roca Bemfica, at 350 meters (Moller). 



Buccinum exaratum MULL., Hist. Verm., ii, p. 148, no. 337 

 (1774). CHEMNITZ, Conchyl. Cab., ix, pt. 2, p. 37, pi. 120, 

 f. 1031, 1032 (1786).Bulla exarata GMEL., Syst. Nat. (13), 

 p. 3431. DILLWYN, Descript. Catal., i, p. 493. Bulimus ex- 

 it rat us BRUG., Encycl. Meth., i, p. 361. CROSSE, Journ. de 

 Conchyl., 1868, p. 131, pi. 6, f. 2. HUPE, in Castelnau, 

 Exped. dans 1'Amer. du Sud, p. 41, pi. 8, f. 3. MORELET, 

 Voy. Welwitsch, p. 59. GREEFF, Zool. Anzeiger, v, no. 122, 

 p. 520 (1882). NOBRE, Explor. Sci. ilha de S. Thome, p. 3 

 (1886). Not B. exaratus Mull., VIGNON, Bull. Soc. Mai. 

 France, v, p. 67, no. 21. FURTADO, Journ. de Conchyl., 1888, 

 pp. 5-9, pi. 2 (anatomy). PFR., Monogr., iii, p. 301. Helix 

 (Cochlitoma) exarata Fer., Prodr., p. 49, no. 339; Histoire, 

 pi. 118, f. 1, 2. Achatina exarata GRAY, Ann. of Philos. 

 (n. s.), ix, p. 414. DESHAYES, in Lam., An. s. Vert., viii, p. 

 311; in Fer. Hist., ii, p. 163. KUSTER, Conchyl. Cab., i, pi. 

 3, f. 5, 6. Limicolarius exaratus BECK, Index, p. 60. Limi- 

 colaria exarata SHUTTLW., Notitire, i, p. 51. Pseudachatina f 

 exarata PFR., Monogr., vi, p. 206; viii, p. 267. Perideris 

 (Atopocochlis} exarata CROSSE & FISCHER, Journ. de Con- 

 chyl., 1888, p. 19. Atopocochlis exarata KOBELT, ConchyL 

 Cab., p. 2, pi. 1, f. 4, 5 (copied from Crosse). 



Genus PSEUDOTROCHUS II. & A. Adams, 1855. 

 Perideris SHUTTLW., Notitiae Malacologicge, i, p. 76 (1856). 

 -PFR., Monogr., iv, p. 592. KOBELT, Conchyl. Cab., i, Abth., 

 10, pp. 24-48. Not Perideris Brandt, Recueil des Actes de 

 la seance publique de 1'Acad. Imp. des Sciences de St. Peters- 

 bourg for 1835, p. 250 (Holothuria) . Achatina, Helix, Bul- 

 imus, and Oxystrombus sp., of various authors. Chersina 

 BECK, Index Moll., p. 74, sp. no. 3 (but not Chersina of 

 Humphrey, Museum Calonnianum, p. 62). Pseudotrochus 

 'Klein' II. & A. ADAMS, Genera of Recent Mollusca, ii, p. 

 135 (Feb., 1855). 



