SALENIA PATTERSONI. 55 



Salenia Pattersoni A. Ag. 



Salenia Pattersoni A. Agassiz, 1878. Bull. M. C. Z., V, p. 187. 



Plates 43, figs. 3, 4; 46, figs. 1-8. 



This species was not taken by the "Albatross," but is included in order 

 to describe its pedicellariae. 



The distribution of the pedicellariae is not peculiar, except that the 

 abactinal system is strikingly free from them, save around the ocular plates j 

 a few are also scattered among the anal plates. 



The quadridentate pedicellariae are very large, the head alone measur- 

 ing up to as much as 2 mm. in length ; the valves (PI. 46, figs. 1 and 2) are 

 straight, broad, and usually flat, but may be more or less compressed and 

 hollowed out. 



The tridentate are much smaller, the valves (PI. 46, fig. 3) only .50-75 

 mm. in length. 



The ovoid pedicellariae show some diversity in size and form ; the valves 

 (PI. 46, fig. 6) are sometimes over .30 mm. long, and occasionally are dis- 

 tinctly pointed and provided with an " articular loop " (PI. 46, fig. 5). 



The globose pedicellariae have the valves (PI. 46, fig. 4) somewhat 

 elongated, .16-.30 mm. in length. 



Salenia cincta A. Ag. and CI. 



Salenia cincta A. Agassiz and Clark, 1907. Bull. M. C. Z., LI, p, 116. 

 Plates 45, figs. 22-25; 52, figs. 8-13; 57, figs. 1-3. 



This handsome species is closely related to S. Pattei^soni A. Ag., but is 

 easily distinguished by its coloration. The test, secondary spines, and espe- 

 cially the abactinal system are a deep purple, or greenish more or less 

 tinged with purple (PI. 57, figs. 1-3). The primary interambulacral radicles 

 are white, more or less tinged with green on the upper side, with 12 to 16 

 broad rings of dull brick-red. The longest radiole of the specimen figured 

 (PI. 57, fig. 1) is 52 mm., with sixteen bands. 



The ambulacral miliary spines are stout, flat, rectangular, with rounded 

 outer angles about 1.75 mm. long, in marked contrast to the thin ones 

 of S. Pattersoni. The test is much flatter than that of Pattersoni; a 

 specimen (PI. 52, figs. 8, 9) 12 mm. in diameter is 7 mm. in height, while a 



