DISSECTION OF SQUID. 257 



(4) Is the siphon, if present, a part of the mantle ? 



(5) Did you find any eyes ? 



(6) Are adductor muscles present ? 



(7) Is there a bivalve shell ? 



(8) Are the gills leaf -like or plume-like ? 



(9) Are there jaws ? 



(10) Is there a lingual ribbon ? 



(11) Are there branchial and systemic hearts ? 



(12) Is there an ink-sac ? 



