Segm"nts, prosomatic of Limulus and its allies, [233], [249]
Segm"nts, prosm"atic of Ammocœtes, [286]
Segm"nts, of spinal region of Vertebrates, [388]
Segm"nts, of trigeminal nerve-group, [257], [279]
Segm"nts, tubular muscles of hyoid, [299]
Sense-organs of Amphioxus, [34]
Sense-o"rans of branchial, of Limulus, [359], [360]
Sense-o"rans of lateral, of Annelids, [357], [367]
Sense-o"rans of lateral-line system, [356], [411], [470]
Serum, [492]