incompta, Brochina [ Caecum armoricum de Folin, 1869] (Figures 17G–I)

1884f: 23 [XXX g: 637]—available name

Type material. MCZR –M–21442 —2 sh “C. ( Brochina) n. sp. De Folin Dalmazia (Brus. come C. glabrum)”// 2 sh “ Brochina glabra Monts. Is. Lacroma” Brusina’s handwriting // 2 sh “C. incomptum” probably from Is. Lacroma and separated by Gaglini (1992a).

Type locality. Described from Brittany (France), Lacroma Is. (Croatia) and Livorno (Italy).

Remarks. Recorded by MolluscaBase (2018) as a synonym of Caecum armoricum de Folin, 1869 based on Hoeksema & Segers (1993).

semitrachea, Caecum (ex Brusina ms.) [ Caecum trachea (Montagu, 1803) pars] (Figures 17J, K) and [ Caecum orientale de Folin, 1868 pars] (Figures 17L, M)

1872b: 38 [VI: 120]—as synonym of C. obsoletum Carpenter, 1858 —not available

1875b: 29 [XII: 255]—as synonym of C. obsoletum Carpenter, 1858 —not available

1878c: 88 [XIX: 402]—as synonym of C. obsoletum Carpenter, 1858 —not available

1884f: 24 [XXXg: 638]—available name

Type material. MCZR –M–21467 —3 sh “ Brochina semitrachea Brus. Is. Ulbo ” // 16 sh “Ma” (Magnisi) // 11 sh “Mo” (Mondello)// 2 sh “ Bona ” // 1 sh “ Alger (Joly)” // 4 sh “P.” (Palermo). Label on the bottom: “ C. semitrachea Brusina ”.

Type locality. Described from Ulbo Is. (Croatia), Palermo, Ognina, Magnisi and Mondello (Sicily), Algiers and Bona (Algeria).

Remarks. Recorded by MolluscaBase as a synonym of Caecum clarkii Carpenter, 1859 . The type material comprises two species: the 3 sh ex Brusina from Ulbo Is. (exegetically indicating the original concept of the species) belong to C. trachea [new synonymy]; the remaining samples correspond to the Mediterranean species previously called C. clarki Carpenter, 1859 . Nofroni et al. (1997) have shown that C. clarki Carpenter, 1859, is limited to the Canary Islands. For its Mediterranean sister species ( C. clarki sensu Auctores) C. orientale de Folin, 1868 is available [new status].