Isops phlegraei n.sp. Sollas, 1880: 396, pl. XVII; Sollas, 1888: 267; Burton, 1930a: 498; Alander, 1935: 2
?Isops globa n.sp. Schmidt, 1870: 69.
Isops pallida n.sp. Vosmaer, 1882b: 16, pl. I figs. 9, 15, pl. II figs. 22-26, 29-38, pl. IV fig. 117.
Isops sphaeroides n.sp. Vosmaer, 1882b: 13, pl. I figs. 10-11, pl. II figs. 27-28, 39-49, pl. IV fig. 116.
Isops pyriformis n.sp. Vosmaer, 1885.