X LIST OF ILLUSTRATIONS. 



Page 



Haploniscus retrospinis. Abdomen of female 76 



Haploniscus retrospinis. (Second antenna) 76 



Haploniscus retrospinis. Abdomen of male 76 



Janirella lobata .' 78 



Jan irella lobata. First leg of female 78 



Janirella lobata. Seventh leg of female 79 



Janirella lobata. First pleopod of male 7!) 



Ma una truncata 80 



Mun na truncata. First pleopoda of male so 



Heteromesus granulatus. Female 82 



Heteromesus granulatus. Second antenna of female 82 



Heteromesus granulatus. First leg of female 82 



Heteromesus granulatus. Middle part of body of male 83 



lit t< romesus granulatus. Abdomen of male 83 



Heteromesus spineseens. Male 83 



Eurycope truncata 85 



Eurycope magnispinis 85 



Diagram showing the course of the axial canals in Isocrinus decorus and Meta- 



crinus rotundus 87 



Diagram showing the course of the axial canals in Isocrinus decorus in their 



natural position 88 



Portion of stem of very young Isocrinus decorus, before the development of the 



Petaloid sectors 88 



Joint faces in a very young stem of Isocrinus decorus, but somewhat older than 



the stem shown in the preceding figure 88 



Lateral view of an isolated infrabasal of Isocrinus decorus or Metacrinus rotundus, 

 showing the furrow which forms half of the canal containing the primary 



axial cord 89 



The infrabasals of Isocrinus decorus or Metacrinus rotundus spread outward, 



showing the course of the furrows along their apposed sides 89 



The circlet of infrabasals of Isocrinus decorus or Metacrinus rotundus, showing 

 the apertures by which the primary axial canals leave the circlet of infra- 

 basals to enter the basals 89 



A basal of Isocrinus decorus or Metacrinus rotundus viewed from the inner end, 

 showing the single aperture by which the primary axial cord enters from the 

 circlet of infrabasals and the two apertures by which the two branches leave 



the basal and enter the radials s!) 



The same basal, ground down to the plane passing through the center of the 

 three apertures to show the course of the canals and the transverse connective 



within the basal 89 



The same basal, viewed ventrally (distally), showing the two apertures by which 

 the two branches of the primary ^.xial canal leave the basal and enter two 



adjacent radials 89 



Dorsal (proximal) view of a radial, showing the two apertures by which the 

 canals enter from two adjacent basals, and the two apertures by which the 



circular commissure leaves the radial 90 



The same radial ground down to a plane passing through all the apertures, show- 

 ing the course of the canals within the radial !»0 



A direct (not foreshortened) view of the ground surface of the same radial 90 



A basal of Endoxocrinus parra viewed from the interior of the calyx, showing 

 the two apertures by which the branches of the primary cord enter the basal, 

 and the two apertures by which they leave the basal and enter two adjacent 

 radials; the course of the canals within the basal is indicated by dotted lines. . 90 



