134 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



Actinometra paudcirra Bell. 



Fig. 10, 11, 12. Specimens showing centro-dorsals from which all cirri have been 

 lost. The variability in outline of the centro-dorsals is interesting, and 

 shows how this character is governed by the contour of the surrounding 

 and underlying plates. After Carpenter, 1888. (PI. 54, figs. 3, 5, 7.) 



Isocrinus wyville-thomsoni Jeffreys. 



13. The terminal nodal of a detached individual showing how the columnal 

 has been smoothed and rounded off by a secondary deposit of stereom; 

 approximately X4. From Carpenter, 1884. (PI. 22, fig. 27.) 



Plate 6. 



Millericrinus prattii (Gray). 



Fig. 1. Individual showing practically resorbed stump of the column of which five 

 columnals have been retained. After Carpenter, 1882. (Pl. 1, fig. 13.) 



2. Specimen with a longer column, which shows signs of resorption in its distal 



portion. After Carpenter, 1882. (PI. 1, fig. 10.) 



3. Individual retaining but three coliunnals and showing no signs of resorption. 



After Carpenter, 1882. (PI. 1, fig. 3.) 



4. Basal view of another specimen the column of which is represented by the 



"proximale" and a single largely resorbed columnal. After Carpenter, 

 1882. (PI. 1, fig. 2.) 



5. View of the distal face of the "proximale," showing its insertion within the 



basal circlet. After Carpenter, 1882. (PI. 1, fig. 22.) 



6. The "proximale" and surrounding basals of an individual the column of 



which has otherwise entirely been lost. The resemblance of this "proxi- 

 male" to a centrale is apparent. After Carpenter, 1882. (PI. 1, fig. 6.) 



Apiocrinus roissyanus d'Orbigny. 



7. Specimen showing supernumerary plates comparable to those found in 



Millericrinus prattii as figured on this plate. After de Loriol, 1882-1884. 

 (PI. 43, fig. 3a.) 



Apiocrinus elegans Defrance. 



8. Specimen showing "intercalated" plates in the theca similar to those noted 



in A. roissyanus, fig. 7. After de Loriol, 1882-1884. (PI. 34, fig. 4.) 



Actinometra nohilis Carpenter. 



9. 10, 11 . Basal views of different specimens showing loss of cirri by the centro- 



dorsals, and the partial resorption of these organs. After Carpenter, 1888. 

 (PI. 65, figs. 3, 4, 5.) 



Plate 7. 



Millericrinus charpyi de Loriol . 



Fig. 1. A specimen showing the highly differentiated nature of the proximal columnal, 

 to which three of the basals are still attached; approximately XIJ. After 

 de Loriol, 1882-1884. (PI. 100, fig. Ic.) 



Millericrinus beaumonti d'Orbigny. 



2. View of an individual showing the cup and proximal columnal. To the 

 right and below is a view of the inferior face of the proximal columnal 

 showing the petaloid type of articulation. After de Loriol, 1882-1884. 

 (PI. 90, figs. 3, 3a.) 



