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AGNA019P.GIF Cephalaspidomorphi -

AGNA018P.GIF Cephalaspidomorphi - Petromyzon marinus - A cross section of an ammocoete through the intestine. Note: intestine, liver, posterior cardinal veins, dorsal aorta, notochord spinal cord, neural canal and myomeres.

AGNA017P.GIF Cephalaspidomorphi -

AGNA016P.GIF Cephalaspidomorphi -

AGNA015P.GIF Cephalaspidomorphi - Petromyzon marinus - Ventral portion of the cross section through the pharyngeal region of an ammocoete. Note: pharynx, gill lamellae, hypopharyngeal ridge, subpharyngeal glands, ventral aorta and myomeres.

AGNA014P.GIF Cephalaspidomorphi - Petromyzon marinus - Dorsal portion of the cross section of the ammocoete through the pharyngeal region. Note: neural canal, spinal cord, notocord, myomeres, gill lamellae, dorsal aorta, anterior cardinal veins and hyperpharyngeal ridge.

AGNA013P.GIF Cephalaspidomorphi - Petromyzon marinus - Dorsal portion of the cross section of the ammocoete through the pharyngeal region. Note: neural canal, spinal cord, notocord, myomeres, gill lamellae, dorsal aorta, anterior cardinal veins and hyperpharyngeal ridge.

AGNA012P.GIF Cephalaspidomorphi - Petromyzon marinus - Ventral portion of the cross section of the ammocoete through the region of the pharynx. Note: pharynx, gill lamellae, hypopharyngeal ridge, subpharyngeal glands, ventral aorta and myomeres.

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