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FOREWORD. Some years ago Dr. Tate Regan suggested to me that a study of the hyoid region of the tailless Amphibia would be of value. This paper is the outcome of that suggestion. It was begun when I was Gilchrist Research Scholar in Zoology at King’s College of Household and Social Science (1 9 2 5 -2 6 and 1 9 2 7 -2 8 ), working under Dr. P . C. Esdaile, to whom I am very grateful for her help during my two and a half years in her department. At this time I was also assisted by a Government Grant from the Royal Society. Since March, 1 9 2 8 ,1 have held a post at the British Museum (Natural History), and the work on frogs has been relegated to spare time. My main purpose has been to discover and make known the structures of the hyolaryngeal apparatus in a large and representative series of the Anura, in order that an idea may be gained of the range of diversity of these organs in the group, and of the extent to which resemblances in their structure are indicative of relationship. In all, I have studied sixty species, belonging to thirty-six genera ; in fifty of these species and twenty-three of the genera the larynx is now described for the first time.

X. The hyoid and larynx of the Anura