756 DE. W. B. CAEPEXTEE ON ANTEDOX (COMATTJLA, LAIVnC.) EOSACEUS. 



PLATE XLIII. 



Fig. 1. Portion of the Sarcodic Basis of the Skeleton o{ Antedon rosaceus, showing the 

 granular glomeruli which occupy the interspaces of the calcareous reticula- 

 tion. — Magnified 120 diameters. 



Fig. 2. Transverse section of a decalcified Arm at a syzygy, showing the radiating exten- 

 sions of sarcodic substance which occupy the grooves of the apposed calcareous 

 segments. — Magnified 30 diameters. 



Fig. 3. Ligamentous substance uniting the dorsal portions of the Brachial segments, 

 magnified 70 diameters; 3a, portion of the same magnified 250 diameters. 



Fig. 4. Muscular fibres, magnified 250 diameters, showing at a their enlarged termina- 

 tions ; A, separated fibres enlarged 870 diameters, showing nuclear (]) cor- 

 puscles, a, h, c. 



Fig. 4. Vertical section of the decalcified skeleton of the basal portion of an Arm of 

 Antedon rosaceus, showing the disposition of the Muscles and Ligaments : — 

 s, s, s, bodies of the segments perforated by the Axial Canal, a, a, and con- 

 nected by the Interarticular Ligaments, l\ l\ and the Elastic Ligaments, P, V ; 

 s\ s\ vertical lamelloe, the spaces between which are occupied by the Muscles 

 m, m. — Magnified 55 diameters. 



Fig. 4. Horizontal section of the decalcified skeleton of the basal portion of an Arm, 

 passing through the Axial Canal «, «, and showing the alternating obliquity 

 of the articulations, as shown in the disposition of the ligaments l\ P ; at 

 sg, sg, are shown in transverse section the radiating extensioTis of sarcodic 

 substance interposed between the syzygies, shown in fig. 2. — Magnified 35 

 diameters. 



