TABLE OF CONTENTS. 



— rage. 



Introduction 1 



Systematic part , 1 



Family 3. Lituolidae 1 



Subfamily 1. Aschemonellinae 2 



Genus Aschemonella 2 



ramuliformis 2 



catenata 3 



Subfamily 2. Reophacinae -. 5 



Genus Reophax 5 



scorpiurus 6 



pilulifer 7 



curtus 8 



agglutinatus a 



var. glomeratus 10 



bilocularis 10 



scottii 11 



distans 13 



var. turbo 13 



var. delicatulus 13 



guttifer 13 



var. spiculilega 14 



robustus, var. septentrionalis 14 



aduncus 15 



nodulosus 17 



dentaliniformis 18 



^ bacillaris 19 



membranaceus 21 



moniliforme 22 



findens 22 



spiculifer 23 



armatus 23 



hispidulus . 24 



cylindricus 24 



sabulosus 25 



Genus Hormosina 26 



globulifera 26 



ovicula 28 



var. mexicana 29 



monile 30 



ovaliformis 31 



carpenteri 31 



normani 32 



Genus Haplostiche 33 



dubia 34 



*var. intermedia 35 



V 



