SALENOCIDARIS VARISPINA. 59 



Coronal plates Gor 7 (rarely 8 in specimens over 16 mm. 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 

 ones 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. ; aotinal 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 system, .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 miiiaris. 



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. 



Salenocidaria varispina A. Agassiz, 1869. Bull. M. C. Z., I, 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 pedicellariaj. 



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

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

 very few as compared with that of miiiaris. 



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

 rare and are very characteristic. The valves (figs. 10, 11) are .50-.60 mm. 

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

 lariaj 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. 



