356 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 2948. Off southern California, 33 55' 30" N., 119 41' 30" W. 

 Bott. temp. ? 266 fathoms. Gy. s., g., brk. sh. 



Station 2951. Off southern California, 33 55' 30" N., 119 55' W. Bott. 

 temp. ? 48 fathoms. Fne. gy. s. 



Station 3051. Off Oregon, 43 59' 15" N., 124 58' 30" W. Bott. temp. ? 

 59 fathoms. Co., brk. sh., rky. 



Station 3053. Off Oregon, 44 4' 30" N., 124 50' W. Bott. temp. 47.3. 

 64 fathoms. Co., brk. sh., rky. 



Station 3076. Off Washington, 47 46' N., 125 10' W. Bott. temp. 43.4. 

 178 fathoms. Gn. m. 



Bathymetrical range, 48-417 fathoms. Extremes of temperature, 56.5- 

 41. 



One hundred and twenty-one specimens. 



Strongylocentrotus pulchellus A. Ag. and Cl. 



Strongylocentrotus pulchellus A. Agassiz and Clark, 1907. Bull. M. C. Z., LI, p. 121. 



Plates 94, figs. 2^-27; 98, figs. 1, 2; 111, figs. 9, 10. 



There are only two specimens of this species at hand and one of those is so 

 small, only 8 mm. h. d., and so obviously immature, that it hardly reveals any 

 distinctive characters. The other (from St. 5003) which may be considered the 

 type (PI. Ill, figs. 9, 10) is 17 mm. in diameter, and about 8 mm. high. The 

 actinostome is about 8 mm. in diameter and the abactinal system half as much. 

 There are 13 or 14 interambulacral plates in each column and 16 or 17 ambulacral. 

 The ambulacra are only a little narrower than the interambulacra but the porifer- 

 ous zones are rather narrow. There are five pairs of pores in each arc from be- 

 low the ambitus to the ocular plate. The pairs, in the mid-zone, are in oblique, 

 somewhat curved arcs, divided by a secondary tubercle into an inner group of 

 two and an outer, lower group of three pairs. The vertical series of secondary 

 tubercles thus divides the poriferous area into an inner and an outer band. 

 Each ambulacral plate carries one primary tubercle, which is relatively rather 

 large, and in the mid-zone a secondary tubercle at the inner end, in addition 

 to the secondary tubercle in the poriferous zone. There are also smaller sec- 

 ondaries and miliaries. The tuberculation of the interambulacral plates is 

 not essentially different but the secondaries are a trifle larger and those on the 

 outer ends of the plates are as close as possible to the poriferous area. Oculars 



