Seven species of ammonites are described from the Lungma (Langma) limestone of Mekyigunru, eight miles south of Kampadzong, Tibet. The genera Sonninia, Witchella, Dorsetensia, and Emileia are represented; two species are new--Witchella tibetica and Dorsetensia? haydeni. The age is middle Bajocian (Jurassic), with only the Sowerbyi and Sauzei zones present, from which it is inferred that the formation here represents a condensed deposit.