The anatomy of the common squid, Loligo pealii, Lesueur . 17 visceral mass and exteml over the edge of the pen to the mantle. However,the fhief connection is furnished by the pen. to whose upper surface the mantleis attached, whereas the large siphonal, nuchal and cephalic retractors are attachedto its lower surface. The pallial cavity is very large and extends back nearly to the dorsal pointof the mantle. By the expansion and contraction of the mantle a large quantityof water is drawn into and expelled from the pallial chamber. The two triangular fins are thin muscle-sheets and together, they
The anatomy of the common squid, Loligo pealii, Lesueur . 17 visceral mass and exteml over the edge of the pen to the mantle. However,the fhief connection is furnished by the pen. to whose upper surface the mantleis attached, whereas the large siphonal, nuchal and cephalic retractors are attachedto its lower surface. The pallial cavity is very large and extends back nearly to the dorsal pointof the mantle. By the expansion and contraction of the mantle a large quantityof water is drawn into and expelled from the pallial chamber. The two triangular fins are thin muscle-sheets and together, they form atlat i-homboidal plate which is attached to the uppersurface of the mantle ami extends from its dorsalpoint o\er /b of its length. The longest side, thebase. of each fin is attached to the mantle and thetwo free edges are of nearly equal length. Thedorsal angles of the two fins form together an acuteangle which ends in a rounded tip. The lateralangle of each fin is obtuse and very much ventral ends of the tins ai-e some distance apart
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