24 THE AMERICAN MONTHLY [Jan. 



193. DICTYOMITRA. 

 Shell with 6-8 deep strictures, joints nearly equal in length articulata 



194. ARTOSTROBUS. 

 Shell with 8-10 internal annular septa, abdomen with 6-8 joints elegans 



195. LITHOMITRA. 



Shell slightly dilated, on each joint a single row of pores pachyderma 



Shell nearly cylindrical, on each joint a single row of pores, joints 



broader and shorter than in the preceding acephala 



Shell sub-cylindrical, thorax with 2-3 rows of pores lineata 



Shell diminishing slightly toward both ends, on each joint a single row 



of pores descending obliquely eruca 



196. EUCYRTIDIUM. 



Shell with 4 joints, cephalis with club-shaped, spinulate or branched 



horn anthophorum 



Shell with 5 joints, cephalis with conical horn eruca 



Shell with 6 joints, cephalis hyaline, with conical horn montiparum 



197. EUSYRINGIUM. 



Shell thick -walled, cephalis with conical horn sipho 



Shell thin-walled, cephalis with pyramidal horn fistuligerum 



198. SIPHOCAMPE. 

 Abdomen with spirally convoluted ribs spiralis 



199. LITHOCAMPE. 



Shell spindle-shaped, with 6 joints equal in length radicula 



Shell club-shaped or ovate, with 6 joints of diiferent lengths clava 



200. STICHOCAPSA. 



Shell pear-shaped with 3 internal septal rings pyriformis 



Shell pear-shaped with 5 internal septal rings hexacola 



Shell pear-shaped with 8 internal septal rings compacta 



Shell spindle-shaped with 4-5 slight strictures radicula 



201. ARTOCAPSA. 

 Shell spindle-shaped, smooth, with 3 sharp strictures quadricamera 



ERRATA. 

 In July Number, 1895. 



Page 206. 

 In genera 79 and 84, for "butschlu" read "butschlii.'' 



Page 207. 

 In genus 94, for "didicerus" read "didiceros." 

 In genus 98, for "Deudrosphyris" read "Dendrospyris, " for "dirrhiga" read 



' 'dirrhiza. ' ' 

 In genus 100, for "articulate" read "articulata." 

 In genus 1 02, for ' 'atenchus' ' read ' 'ateuchus. ' ' 



