MOELLENDORFF : LAND SHEELS OF CAROLINE ISLANDS. I07 

 Diam. 9, alt. 10 mm. (Pease). 



Helix congrua, Pease, Am. Journ. Conch., 1868, iv, p. 154, t. 12, 

 figs. 3 — 4. — Tr. contvjua, Pease, P.Z.S., 187 1, p. 457. — 

 Tryon, Man. Conch., iii, p. 78, t. 15, figs. 38 — 39. — Helix 

 contiijua, Pfr., Mon. Hel., vii, p. 289. 



Hah. — Ponape (Pease, Etscheid, Kubary). 



Pfeiffer has ah-eady doubted the vahdity of Pease's species ("nonne 

 varietatibus H. nigritellae, specie! forma pervariabiHs, adnumeranda?") 

 and I can only admit it as a sub-species after examination of many 

 hundred examples. The spire is higher on an average, but T. 

 nigritella varies likewise in that respect, so that the highest forms 

 of the latter are higher than the lower ones of contigua. The base is 

 flat instead of slightly convex, and sometimes even excavated, but there 

 are transitory forms of nigritella with almost flattened base. The two 

 races do not seem to live promiscuously in the same locality inasmuch 

 as I received in one box only contigua, in another only nigritella. 



There are more colour varieties of the sub-species than of the 

 type, viz., atrofusca, castanea, taeniata, tjrunnea, fidva and flava. 



Fam. PHENACOHELICIDAE, Suter. 



( = Endodontidae, Pilsbry, ex parte.) 



As I have said elsewhere^ I consider Pilsbry's arrangement of 

 including the well-defined family of Pheuacohelicidae, Suter ( = Charo- 

 pidae, Hutton) within his Endodo7itidae as a regrettable step backwards. 

 The two families are not only conchologically well distinguished, but 

 have different types of jaw and radula and the Plienacohelicidae possess 

 a mucous pore. 



11.— Flammulina (Calymna) nigpeseens, n. sp. 



T. anguste perforata, discoidea, tenuis, subpellucida, confertim 

 costulato-striata, lineis spiralibus microscopicis decussata, cuticula 

 nigrescente costulata ad peripheriam subfimbriata obducta, opaca, 

 fusca. Spira plana aut pauUum immersa. Anfr. 3i rapide accres- 

 centes, convexiusculi, sutura profunda disjuncti, ultimus subangulatus, 



I N. Bl. D. M. G., 1895, p. 157 and 1899, p. 23. 



