. Science-gossip . Helicoid genus Corilla, with which we areconcerned in the first place, is an interesting groupof landshells inhabiting the jungles of Geylon,with a single outlying species in the southernpoint of the Indian Peninsula. The armature,which sometimes exhibits considerable complica-tion, consists generally of a variable number ofrevolving plates or folds on the inner side of theshell-wall. It may bementioned as a curiousfact that a single species,namely Corilla charpen-tieri (Geylon), is devoidof armature (fig. i). I was favoured notlong ago by Mrs. R. , of Singapore, withso
. Science-gossip . Helicoid genus Corilla, with which we areconcerned in the first place, is an interesting groupof landshells inhabiting the jungles of Geylon,with a single outlying species in the southernpoint of the Indian Peninsula. The armature,which sometimes exhibits considerable complica-tion, consists generally of a variable number ofrevolving plates or folds on the inner side of theshell-wall. It may bementioned as a curiousfact that a single species,namely Corilla charpen-tieri (Geylon), is devoidof armature (fig. i). I was favoured notlong ago by Mrs. R. , of Singapore, withsome shells collected by her during a stay of several months in Ceylon ;amongst these were eight specimens of a shell which,at first, I was inclined to refer to Corilla odontophora,of Benson, but, after some research and carefulcomparison with allied forms, it became e\identthat I had to deal with a new form. It is probable,however, that it already exists in collections, asMr. Hugh Fulton sent me a specimen labelled. Fig. I,—Corilla charpentieri. SCIENCE-GOSSIP. 89 Gorilla humberti, and Mr. John Ponsonby alsopossesses specimens of a similar form under thesame name ; but on submitting one of my specimensto the describer of that species, Dr. A. Brot,of Geneva, he informed me at once that it wasnot Gorilla humberti, but rather, he thought, avariety of Gorilla erronea, of Albers. Dr. Brotobligingly forwarded one of the only two speci-mens of Gorilla humberti known to exist in collec-tions, so that, thanks to his kindness, I amenabled to give a figure of it for comparison withits allies. There appears to be a certain amount ofconfusion with regard to the limits of somespecies, as well as to the position and number ofteeth or plates in some of the Cingalese membersof the genus, and it is hoped that the presentnotes may help to elucidate some of the doubtfulpoints. The new shell is certainly distinct fromall the published species of the group, and I have
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