SALENOCIDAKIS VARISPIKA. 59 



Coronal plates 6 or 7 (rarely 8 in specimens over 15 lam. h. d.) ; each 

 of the two series of ambulacral tubercles consists of 3 (2-4) 

 larger tubercles actinally'and 11 or more (8-19) abruptly smaller 

 cues abactinally ; size larger, h. d. sometimes exceeding 16 mm. 

 V. d., .50-.55 h. d., or, including the abactinal system, .60- 

 .80 h. d., but usually about .70 ; abactinal system, .65- 

 .75 h. d. ; actinal system, .50-. 60 h. d. ; abactinal sys- 

 tem, even in mature specimens, with right posterior 

 ocular plate excluded from the periproct; ambulacral 



plates 10-15 in each column profundi. 



V. d., .60-.70 h. d., or, including the abactinal system, .75- 

 .90 h. d., but usually about ,80 ; abactinal sjstem, .60- 

 .70 h. d. ; actinal system about .50 h. d. ; abactinal 

 system with right posterior ocular plate usually in 

 contact with the periproct; ambulacral plates 14-22 



in each column miliaris. 



Primary spines shorter and much stouter, verticillate but quite smooth ; 

 greatest thickness of shaft equalling or exceeding diameter of milled 

 ring crassispina. 



Salenocidaris varispina A. Ag. 



Sedenocidaris varispina A. Agassiz, 1869. Bull. M. C. Z., T, p. 254. 



Plate 45, figs. 10-15. 



This species was not taken by the "Albatross," but is included so as to 

 give an account of the pedicellariae. 



The distribution of the pedicellarioB is practically the same as in the other 



Salenidse, but they seem to be less abundant. The abactinal system carries 



very few as compared with that of miliaris. 



The quadridentate seem to be entirely wanting, but the tridentate are not 



rare and are very characteristic. The valves (figs. iO, U) are .50-. 60 mm. 



in length, strongly curved and indented near the tip. The ovoid pedicel- 



larioe are very scarce, and have valves (fig. 12) only .15-.25 mm. long. The 



globose show little variety in appearance ; the valves (fig. 13) range from 



.12-.30 mm. in length and are decidedly longer than broad. 



