The anatomy of the common squid, Loligo pealii, Lesueur . sthe upper but is less compressed and morecurved so that it fits over the distal end of theinner mandil^le. The inner lamella has muchthe same shape and size as the outer lamella ofthe upper jaw; the outer lamella of this jaw,is a long, broad band which extends backw^ardparallel to the edge of the jaw and forms apair of prominent wings, the alae. The upperjaw is comparatively fixed while the lower rotatesthru an angle of 45° about an axis which passesalmost thru the middle of each side of theinner lamella of the upper jaw. The muscularf
The anatomy of the common squid, Loligo pealii, Lesueur . sthe upper but is less compressed and morecurved so that it fits over the distal end of theinner mandil^le. The inner lamella has muchthe same shape and size as the outer lamella ofthe upper jaw; the outer lamella of this jaw,is a long, broad band which extends backw^ardparallel to the edge of the jaw and forms apair of prominent wings, the alae. The upperjaw is comparatively fixed while the lower rotatesthru an angle of 45° about an axis which passesalmost thru the middle of each side of theinner lamella of the upper jaw. The muscularfibres (Text figure 11. c) which move the jaws arise from the inner lamellaof the upper jaw and take a spiral course around this axis. The fibres (3 inthe figure) from the lower portion of the middle of the innei lamella of theupper jaw pass directly outward and are inserted in a strong, superficial fasciawhich is attached to the outer lamella of the lower jaw and which coversthe lower half of the pharynx. These fibres form a central column around which.
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