134 EXPLANATION OT" THE PLATES. 



PLATE XV. 



ASTEROPSIS IMBRICATA. 



Fit. 1. Seen from above; in two of the arms the water-tubes of the abactinal surface are represented as 

 fully expanded, while they are drawn in on the others. 



Fif. 1'. Actinostome with the tentacles drawn in, taken from life ; the plates, except the marginal ones, 

 are all imbedded and liidden in the membrane of the actinal surface. 



Fig. 2. Preparation showing the irregular limestone plates and needles of the abactinal surface. 



Fi<'. 3. Portion of abactinal surface, seen from the interior, showing the original reticulation, which is lost 

 in the exterior view from the abactinal side. 



Fif. 4. Fig. 2, seen from the actinal side, to show the arrangement of the limestone plates. 



Fio-. 5. Interior view of the actinal floor, showing the broad ambulacral groove, the connection of the 

 ambulacral plates round the actinostome, and the position of the pillars connecting the actinal and 

 abactinal surfaces. 



Fig. 6. Same as Fig. 5, seen in profile, to show the interbrachial arches and the great height of the am- 

 bulacral plates. 



Fig. 7. Section across the arm near the tip ; the ambulacral plates almost touch the abactinal surfaces. 



All figures are natural sizes. 



On the actinal side Asteropsis is of a brownish color, with yellow edge along the ambulacral furrows. The abactinal 

 surface is most brilliantly colored witli large patches, irregularly aiTanged, of vermilion, bright green, blue, yellow, with 

 prominent carmine spots enclosing the areas for the passage of the water-lubes. 



PLATE XVL 



PenTACEROS RETICULATU.S. 



Fig. 1. Arm and portion of the disk with water-tubes fully expanded and ambulacral tubes extending 

 beyond the edge of the arms near the tip, seen from the abactinal side. 



Fig. 2. Same as Fig. 1, seen from the actinal side, the two rows of tentacles drawn in and ambulacral 

 furrow almost closed near the face. 



Fig. 3. Actinostome natural size, with the ambulacral tentacles at base of furrow fully expanded. 



Fig. 4. Actinal view of the lower surface, showing the limestone plates of the margin of furrow sup- 

 porting the papillse, and the plates covered by the granulation of Fig. 2. 



Fig. 5. Interior view showing the ambulacral system, the connection of the ambulacral plates round the 

 actinostome, the thick abactinal surface with the nearly solid interbrachial limestone arches. 



Fig. 6. Central portion of the abactinal surface of the disk, natural size, showing the massive reticulation 

 of the surface. 



Fig. 7. Section through the centre of the ambulacral system, seen in profile, with the interambrachial 

 arches. 



Figs. 3 and 6 somewhat enlarged ; others, natural size. 



The general coloi-ing of this species is yellowish or pinkish brown, sometimes bright carmine. The ridges separating 

 the spaces for the passage of the water-tubes are a darker shade of the general color. On the actinal edge the plates are 

 of a darker brown color, while the .actinal surface itself is faintly colored gray. 



PLATE XVII. 



SOLASTER ENDECA. 



Fig. 1. Limestone network of the abactinal surface. 



Fig. 2. Dried specimen, with spines bordering the ambulacral furrows and covering the actinal surface. 



Fig. 3. Interior view of the actinal floor, showing the narrow furrow of the ambulacral system, its con- 

 nection round the actinostome, the absence of a prominent interbrachial arch separating the central 

 arm-spaces. 



