808 



squameus 



tennis 



trispinosns 



667. 

 667, 691, 692. 709, 7-2-2, 744, 

 753. 767, 772. 



ADDENDUM. 



To p. 354, after line 12 (Hipp. sj.mosn) : 



Clark describes a young specimen from lower Califurnin [: 13, p. 194] : 



" A specimen -with B only 9 mm. seems to be undoubtedly the young of this species, 

 although it was taten .at a considerably greater depth than has been hitherto known for spinosa. 

 There are only four marginal plates in each seiies. These carry conspicuous thick spines ; if 

 there are two or three on a plate, one (the median of three) is notably larger than the others. 

 The abactinal plates are each bordered with spiniform granules from four to twelve in number 

 according to the size of the plate. The primary plates are conspicuous and erich carries a 

 central spinelet. Actinnlly the furrow and siibambulacral spines are conspicuous, but the spini- 

 form granules of the actinal intermediate plates are very small. No pedicellariœ are to be seen 

 anywhere actinally but five or six on the .abactinal surface are very conspicuous; there are 

 none on the maiginal plates. 



" Station 5693. Northwest of San Nicolas Island, California, 451 fms." 



Published December 17th, 1914. 



