356 HAWAIIAN AND OTHER PACIFIC ECHINI. 



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

 Bott. temp. ? 206 fathoms. Gy. s., g., brk. sh. 



Station 2951. Off southern California, 33° 55' 30" X., 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 CI. 



Strongylocentrotua pulchellus A. Agassiz and Clark, 1907. Bull. M. C Z., LI, p. L2I. 



Plates 94, figs. 2J^-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. HI, figs. 9, 10) is 17 mm. in diameter, and about 8 mm. high. The 

 actinostomc 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 httle narrower than the intorambulacra but the porifer- 

 ous zones arc 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 tulierclo into an inner group of 

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

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

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

 largo, 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 niiliaries. The tuberculation of the interambuhicral plates is 

 not essentially different but the secondaries are a trifle larger and tho.se on the 

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



