. Anniversary memoirs of the Boston society of natural history ; pub. in celebration of the fiftieth anniversary of the Society's foundation. 1830-1880. Natural history; Indians of North America. 14 MINOT ON THE TONGUE. portions and enters the tip. The upper surface of the tip has a deep frontal fissure, and is thrown into fine transverse folds, behind which is a broad flattened median dorsal ridge ; fig. 2, a, narrow posteriorly but widening frontwards. Duvernoy (V, p. 11), considered this ridge {d in his figure IT) to be the posterior extension of the glandular portion, but in C. dilepis it
. Anniversary memoirs of the Boston society of natural history ; pub. in celebration of the fiftieth anniversary of the Society's foundation. 1830-1880. Natural history; Indians of North America. 14 MINOT ON THE TONGUE. portions and enters the tip. The upper surface of the tip has a deep frontal fissure, and is thrown into fine transverse folds, behind which is a broad flattened median dorsal ridge ; fig. 2, a, narrow posteriorly but widening frontwards. Duvernoy (V, p. 11), considered this ridge {d in his figure IT) to be the posterior extension of the glandular portion, but in C. dilepis it is entirely muscular. A transverse section, through the line 2, of fig. 2, is represented in the accompanying cut 3. The whole upper half is strongly pigmented. The extension H, of the hyoid^ occupies the centre of the lower part of the section; its structure is noteworthy. Its core is composed of loose parenchymatous tissue, somewhat resembling that of the vertebrate chorda dorsalis, in that it consists of thick walled cells, having only a very loose sarcodic network, and a protoplasma " Hof" around the nucleus. A similar tissue fills, as will presently be described, the hyoid bones and cartilages of the mocking bird (Mimus polyglottus). The ques- tion therefore arises, whether this form of the medulla ossium is general among the Sauropsida. Around the parenchymatous core is a sheath of circular fibres or perhaps elongated cells. Outside of this follows a layer of longitudinal fibres, which from their distinctness and considerable diameter, I at first thought might be muscular, but I could not observe any striae, or indications of fibrillar structure, so that I am uncer- tain as to their nature. Entirely surrounding this layer is a thick fibrillar sheath. The extension of the hyoid therefore consists of four parts. It lies in a distinct space, apparently, though perhaps not really, a cavity, which is limited by a fibrous wall, that gives rise to two obliquely radiati
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