134 EXPLANATION OF THE PLATES. 



PLATE XV. 



ASTEROPSIS IMBRICATA. 



Fi". 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. 



Fio-. 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. 



Fif'. 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. 



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



FifT. 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. 



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



All figures are natural sizes. 



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

 surface is most brilliantly colored with large patches, irregularly airanged, of vei-milion, bright green, blue, yellow, with 

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



PLATE XVI. 

 Pentaceros reticdlatus. 



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 papillic, 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. G. Central ])ortion 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 C somewhat enlarged ; others, natural size. 



riip general coloring of this species is yellowish or pinkish brown, sometimes bright carmine. The ridges separating 

 tile spares for the passage of the water-tubes arc 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. 



1M..VTE XVII. 



SOLASTER ENDECA. 



Fig. 1. T/imostone network of the abactinal surface. 



Fig. 2. DriiMl s|M'cinuMi. with s|)iiifs bordering the amluilacral t'urrows and covering the actinal surface. 



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

 nection round the aclino.stome. the absence of a |>roniinent interbrachial arch sep.irating the centrAl 

 arm-Hpaci's. 



