SALENIA MILIARIS. 41 



in certain stages covered by a few large anal plates of uniform size ; but 

 they arc disconnected as compared with the solid pavement formed by the 

 plates of the anal system of Gauthieria. 



In the ambulacra! system of Acrosalenia primary ambulacral plates are 

 split into two, and an intercalated plate, carrying oidy a small tubercle or 

 miliaries (PI. 22, figs. 2, 3), is found between the primary plates with two 

 pairs of ambulacral pores, as in Salenia Pattersoni, Figs. 76, 77. Near the 



8.8 mm. 



Fig. 65. Acrosalenia spinosa. 



actinal system the ambulacral plates become resorbed and crowded together 

 and this arrangement is entirely lost (PL 22, figs. 1-,!), though it reappears 

 again, and is followed as far as the apical system by a single line of small 

 plates, Fig. 65. 



In the abactinal system of the youngest Acrosalenia examined of 7.3 mm., 

 (PI. 22, fig. 4), the two ocular plates of the posterior lateral ambulacra 

 are hexagonal and in contact with the anal system by one of their sides, 

 but the ocular of the left posterior ambulacrum is the smallest, and it seems 

 to be that plate which reaches the anal system last of the two (PI. 22, figs. 

 '>• 5), the ocular of the right posterior reaching it evidently first (PI. 22, 

 fig. 5), as it does in Salenia miliaris. 



Salenia Gray. 

 Salenia miliaris A . Ag. 



Salenia miliaris A. Ag., Bull. M. C. Z. 1898, XXXII, No. 5, p. 74, PI. II, figs. 2-4. 



Plates 14, figs. 3-11 ; 15, figs. 1, 2- 16-19 ; 20, figs. 1-4. 



This species can at once be distinguished from its congeners by the great 

 size of the anal system (Pis. 16, figs. 2, 4, 6 ; 17, figs. 2, 3), which is irregu- 

 larly hexagonal and covered by a larger number of plates than in S. 



