KCHINOIDEA. I. 



The apical area (PI. XVI. Fig. 6) is generally somewhat raised, but otherwise of the common 

 form; also here sometimes two pores may be found in one genital plate, as in the figure. Only 

 2 3 tubercles on each genital plate, one or none on the ocular plates. The periproct rather large, 

 covered by numerous small, more or less knob-shaped plates assuming towards the anus a somewhat 

 lengthened form. No distinct central plate. 



The buccal membrane with numerous fine fenestrated plates of the same form as in Ech. 

 Alexandri, sometimes also with rather many bihamate spicules. There are no spines on the buccal 

 plates, and none or very few pedicellariae outside of these. The gills with the usual irregular fenes- 

 trated plates and most frequently rather numerous bihamate spicules. 



The spines are long and strong, but hardly so much varying in length as in Ech. Alexandri; 

 exact informations of this fact cannot be given, as the spines are broken on the specimens in hand 

 (when they are not quite rubbed away). The actinal spines are not broad and flat at the point. 



The pedicellarue are generally not numerous, especially the tridentate and globiferous ones, 

 and as in the preceding species one or other of these forms may be quite wanting. The globiferous 

 pedicellarise (PI. XVIII. Fig. 16) have generally 2 2 lateral teeth, more rarely 3 teeth; sometimes only 

 one tooth is found on one side. Otherwise they show no constant difference from those of Ech. Alex- 

 andri. Rather numerous cross-beams seem always to be found between the edges of the blade. The 

 tridentate pedicellarise (PL XVIII. Figs. 4, 28) are very different from those of the preceding species; 

 the blade is very long, narrow, and deep with a rather well developed system of beams at the bottom. 

 The apophysis at its upper end spreads into a large perforated plate; most frequently a narrow, 

 irregular prolongation passes from it some way into the blade, being placed a little deeper than the 

 plate. The edge is as usual provided with transverse series of small teeth, perhaps a little less 

 numerous than in Ech. Alexandri. The valves are very wide apart, only joining for a little way at 

 the point, which is a little obliquely cut off; in this part the edge is slightly sinuate. The length of 

 the head up to 2 - 2 mm . The ophicephalous pedicellarise chiefly of the same form as in the preceding 

 species, only the indentations being perhaps a little less developed; the peculiar lengthened form that 

 may be found in Ech. Alexandri, I have not found in this species. The triphyllous pedicellarise 

 (PL XX. Fig. 21) of the common form. The sphseridise (PL XIX. Fig. 27) as in the preceding species, 

 but with fewer spines at the point, often quite smooth. The spicules (PL XX. Fig. 17) are pretty 

 varying in form; they are rather numerous in tube feet and gills, and sometimes in the buccal mem- 

 brane; at the base of the spines no spicules are found. 



I can give no information of the natural colour of this species; all the specimens in hand are quite 

 bleached both on the test and the spines. It reaches scarcely to so considerable a size as. Ech. Alexandri. 



Ingolf st. 46 (6i32'N. L. n35'W. L. 720 fms. Gray mud with stones. Bottom temp. 2 8). 8 spcms. 



- 47 (61 32' 13 40' 950 Mud with Globigerina. 3 i). 31 

 49 (62 07' 15 08' 1120 - ? 3 3). 7 



- 50 (62 43' 15 07' 1020 Mud. 3 o). 3 



- 52 (63 57' 13 32' ' 420 ? 7 2). 2 



- 53 (63 15' i5 o/ 795 3o). 2 



- 64 (62 06' 19 oo' 1041 ? 3 i). 10 



- 65 (6i33' 19 oo' 1089 Mud. 3 3). 26 



