40 ECHINOIDEA. I. 



Tinpaired tooth at the point. The niouth is large, broad below, more narrow above; it reaches to the 

 very point. The edge is set with small teeth, the npper one on each side somewhat more distinct, 

 sometimes mnch larger than the others (PI. VIII. Fig. 26). These two nppermost teeth mav be bent 

 towards each other and coalesced towards the point, so that a little opening appears on the npper 

 side of this apparently nnpaired end-tooth, and when this is the case the resemblance to the pedicel- 

 lariæ of D. papillata is considerable ; bnt here, however, is never fonnd the rather long, closed part 

 below the end-tooth, which is fonnd in D. papillata. The lower limit of the mouth generally forms a 

 fine, regular cnrve. In a conple of specimens the point of the large globiferous pedicellariæ showed a 

 deviating, but very irregular construction, which was nnich more like that in D. papillata. As these 

 individnals otherwise agree exactly with the others, this deviation must be taken to be abnormal. It 

 is a very conspicnons peculiarity in the large globiferous pedicellariæ of this species that the back- 

 side is quite clear without holes all over the outer part of the blade; in D. papillata the back-side is 

 highly perforated and of a very complicate construction to the ver\- mouth. — Length of the head 

 ca. I™", the stalk often a little shorter. The structure of the stalk as in D. papillata. 



The small globiferous pedicellariæ are upon the whole of the same construction as the large 

 ones (PL VIII. Figs. 28, 30, 36); the nppermost pair of teeth may also here be coalesced at the points 

 (PI. VIII. Fig. 23). I have not been able to find tridentate pedicellariæ in any of the specimens in hånd. 



The spicules of the tube-feet (PI. XI. Fig. 28) are very characteristic, and yield an excellent 

 mark by which this species may be distinguished from the other Atlantic Cidarids. They are small 

 fenestrated piates placed in two separated longitudinal series; they do not join on either side, such as 

 is the case in D. papillata and Cidaris a(finis. They are most developed on the tube feet below at 

 the peristome, in the upper ones they are more simple and more like the common Cidarid-spicules. 

 In quite small individnals they are often only mnch branched, not yet perforated piates. Upon the 

 whole they are comparatively smaller than in D. papillata; they are slightly arched corresponding to 

 the form of the foot, and are as usnal situated transverseh' on the longitudinal axis of the foot. 



In the intestine, the genital organs, and the organs of Stewart numerous spicules are fonnd; 

 those of the intestine have three rays, the others are larger, irregular piates (PI. XI. Figs. 12, 16, 23). 

 The dental apparatus shows no marked peculiarities. The auricles are rather high and narrow; on 

 the ambulacral areas small and fine processes are fonnd. (In D. papillata and C. af/i 11 is are likewise 

 fonnd rather well developed ambulacral processes. (Comp. Duncan 129). (PI. VI. Figs. 5— 6.) 



In some of the specimens the lower part of the spines is slightly reddish; otherwise this .species 

 appears to have no marked colour. The preserved specimens are brownish. 



<-Ingolf:> St. 9. (64° 18' N. Lat. 27^0' W. L. 295 fathom.s. Bottom temperature 6= 2). 16 specimens. 



- -16. (65° 28' - 27^05' - 250 — - 6° 4). 4 - 



- -81. (61° 44' - 27° II' - 485 - _ -5° 7). 2 - 



- - 84. (62° 58' - 25° 24' - 633 - _ 4° 4). 4 _ 



- - 85. (63° 22' - 25° 21' - 170 - - ). I _ 



- - 89. (64° 45' - 27° 20' - 310 — - 8° ). 4 - 



- - 97- (65° 28' - 27° 39' - 450 - - 5° I). 2 - 



Further we have 5 .specimens from the Denmark Strait (64^ 42' N. Lat., 27° 43' W. L., 426 fathoms) 

 obtained in 1889 by Wandel. 



