1896.] MICROSCOPICAL JOURNAL. 21 



Shell conical, feet divergent rliizodon 



Shell pear-shaped, feet cylindrical, parallel rhizopus 



Shell campanulate-conical, feet cylindrical, s-shaped radicata 



166. DICTYOPODIXJM. 

 Feet fenestrated througliout, diverging, pores in thorax and abdomen 



small eurylophos 



Feet fenestrated throughout, diverging, pores in thorax and abdomen 



large oxylophos 



Feet fenestrated at end, nearly vertical, s-shaped cothurnatuni 



167. LITHORNITHIUM. 

 Thorax with 3 broad triangular wings of ^ the length foveolatum 



168. THEOPERA. 



Shell 3-sided pyramidal, wings broad and long .pyramis 



Shell slenderly ovate, wings prolonged into slender spines luscinia 



169. RHOPALOCANIUM 



Shell nearly spindle-shaped, abdomen inversely conical ornatum 



Shell nearly ovate, abdomen inversely campanulate prolonged into tube 



pythia 



170. LITHOCHYTRIS. 



Feet solid, abdomen without prominent edges tripodium 



Feet fenestrated, abdomen with sharp prominent edges pileata 



Feet fenestrated, abdomen with rounded edges pyramidalis 



Feet fenestrated, abdomen without prominent edges vespertilio 



171. PHORMOCYRTIS. 



Shell smooth, cephalis with pyramidal horn of the same length embolum 



Shell rough, cephalis with cylindrical horn about as long as the shell 



longicornis 

 172. ALACORYS. 



Peristome with four feet tetracantha 



Peristome with five feet pentacantha 



Peristome with six feet hexapleura 



Peristome with eight feet aculeata 



Peristome with nine feet gigas 



Peristome with twelve feet dodecantha 



Peristome with eighteen feet, shell rough carcinus 



Peristome with 18-24 feet, shell smooth ornata 



173. CYCLADOPHORA. 

 Abdomen with 6 ribs, shell lantern shaped, with 2 sharp strictures 



hexapleura 

 Abdomen with 6 ribs, shell pyramidal, with 2 slight strictures... pyramidalis 



Abdomen with 6 ribs, shell spiny, with 2 deep strictures spinosa 



Abdomen with 9 ribs nonagona 



Abdomen dilated, with 15-20 divergent ribs campanula 



