Cl. Cephalopoda,
    SubCl. Coleoidea,
        Or. Decapoda
 

Loligo (dissection, circulatory system; 110K) A-anterior vena cava,  B-kidney,  C-branchial heart,  D-posterior vena cava,  E-systemic heart,  F-pen

Loligo (dissection, digestive system; 118K) A-digestive gland,  B-esophagus,  C-buccal bulb,  D-stomach,  E-cecum,  F-rectum,  G-inc sac,  H-jaws (mandibles), I-radula

Loligo (dissection, female reproductive system; 88K) A-mantle,  B-accessory nidamental gland,  C-oviduct,  D-oviducal gland,  F-ovary,  G-nidamental gland

Loligo (dissection, male reproductive system; 85K) A-penis,  B-spermatophoric gland,  C-spermatophoric sac,  D-vas deferens,  E-testis,  G-stellate ganglion

Loligo (dissection, male vs female; 96K) Most obvious is female (lower)  has nidamental gland and highly granular gonad.  A-arms,  B-siphon (funnel),  C-siphon retractor muscles,  D-fin,  E-mantle,  F-tentacles,  G-ctenidium