PLATE LVIII. 



The Lettering is the same in all the Figures. 



ai. Primary interradial cords. 



ar. The secondary (radial) cords. 



B. Basal plate. 



c. Bands of connective tissue in the body-cavity. 



ch. Cavities of the chanibereil organ. 



clt'. Their downward prolongations into the stem. 



c. External epithelium. 



/(/. Fore -gut. 



G. Gut. 



('6. Intei'visceral blood-vessel. 



L. Interradial ligament. 



I. Basiradial ligament. 



Ih. Intcrbasal ligament. 



III. Limestone network in the perisome. 



Is. Interarticular ligament of stem. 



}). Pigment granules. 



R'. First radial. 



re. Kectuni. 



rp. Plug of calcareous tissue within the radial funnel. 



V, Central vascular axis of stem. 



X. Plexiform aland. 



Figs. 1-3. Pentacrinus decorus, Wyv. Thorns. 



Fig. 1. Horizontal section through the lower part of the calyx, showing 

 the bifurcation of the primary interradial cords {ai) in 

 the basals, ...... 



Fig. 2. Horizontal section through the lower part of the radial 

 pentagon, showing the upward extensions of the cavities 

 of the chambered organ [ch), .... 



Fig. 3. The central part of a median vertical section through the calyx, 

 showing the chambered organ and its connection with the 

 vascular axis of the stem, .... 



Diam. Page 



40 



40 



40 



124 



105 



104 



Fig. 4. Pentacrinus naresianus, n. sp. 



Fig. 4. Portion of a horizontal section of the disk, showing the position 

 of the plexiform gland {X) between the fore-gut and the 

 rectum. . . . . . . . x 30 



101 



Figs. 5, G. Promachocrinus kergueleksis, n. sp. 



Fig. 5. Portion of a horizontal section of the disk, showing the plexi- 

 form gland (A'), . . . . . . x 35 



Fig. G. A similar section nearer the calyx, 



35 



101 

 101 



