134 



ECHINOIDEA. II. 



within the fasciole to be the 7th (on the left side only); otherwise it is the 6th as fouiid b}- Lovéu 

 to be a general nile. (For an interesting exception to this rule, see sub Brissopsis, p. 163). 



Regarding the development of the petals I ma\' notice that the large pores in the anterior 

 series of the antero-lateral petals do not appear before the specimens have reached a length of ca. 

 15™™. From the table given here it is f urther seen that no small variation mav occur in this respect. 

 (The specimen of 14'"'" is a little higher than nsual). 



Number of pores in the petals. 



The tube-feet and spicnles have been described b\- Perrier and Loven and need not be 

 further described. I may only recall the cnrious subanal tube-feet, with the thick, clubshaped support- 

 ing rods of the filaments, described and figured by Loven (On Pourtalesia. p. 48. PL VIII. 57); they 

 are characteristic of all the species of Echiiiocardium (as well as of Lovcnia). 



The pedicellariæ have been partly described alread\- by Sars, and later on by Perrier, 

 A. Agassiz and Koehler. In his ^Beskrivelser og Iagttagelser etc.» (1835) M. Sars mentions and 

 figitres (PI. IX. 23. a. — b.) a kind of pedicellaria which can only be the globiferous. Perrier (loc. cit.) 

 describes and figures a globiferous pedicellaria (wrongl)- regarding it as a kind of tridentate pedicel- 

 laria), and Agassiz (Rev. of Ech. PI. XXV. 26) a tridentate pedicellaria. A closer examination has 

 been given by Koehler (loc. cit), who describes four kinds of pedicellariæ, evidently corresponding to 

 the globiferous, tridentate, rostrate and triphyllous. Besides these I also find, in young specimens 

 ophicephalous pedicellariæ. A renewed examination of all these forms is necessary, especially as the 

 structure of the valves has not been hitherto described or figured in a detailed manner. 



The globiferous pedicellariæ (PI. XVII. Figs. 4, 10, 45) are said by Sars to be arranged in five 

 imperfect series, though somewhat disorderly. I find them, in accordance with Koehler, distributed 

 qnite irregularly over the abactinal side, in very different numbers, sometimes qnite wanting. The 

 valves (PI. XVII. F'igs. 4, 10) terminate in 6 — 8 long, slender teeth (not two, as stated by Perrier), 

 4 — 6 of which are at the point, two being placed lower down, one on each side. The latter are gene- 

 rally somewhat larger than those at the outer edge; sometimes there are two lateral teeth on one 

 side, and sometimes there is a tooth in the median line, just below the terminal slit The blade is a 

 narrow, closed tube, with a small slit at the point There is evidently no gland in the interior of the 

 blade; the edges of the basal part, as well as of the apophysis, are smooth. There is no neck; the 

 stalk has a small thickening at the upper and lower end. The size is rather variable, but generally 



