Summary. The external and internal features of the head of Ligia oceanica are described, and a terminology proposed for them and for similar structures in all terrestrial Isopods. The 1st thoracic somite is shown to be distinctly demarcated from the head in this genus. The “maxillosternal” framework and the endophragmal skeleton is described and its morphology discussed. The mechanism and structure of the appendages of the head is described and compared with that of other Isopods. The musculature of the head is described and its bearing on the form of the head and mechanism of the appendages is discussed.
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Harold G. Jackson (1926) studied this question.