134 



ECHINOIDEA. II. 



within the fasciole to be the 7th (on the left side only); otherwise it is the 6th as found by Loven 

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



Regarding the development of the petals I may 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. 

 i5 mm . From the table given here it is further seen that no small variation may occur in this respect 

 (The specimen of i4 mm is a little higher than usual). 



Number of pores in the petals. 



The tube-feet and spicules have been described by Perrier and Loven and need not be 

 further described. I may only recall the curious 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 Echinocardium (as well as of Lovenia). 



The pedicellarise have been partly described already by Sars, and later on by Perrier, 

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

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

 describes and figures a globiferous pedicellaria (wrongly regarding it as a kind of trideutate pedicel- 

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

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

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

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

 structure of the valves has uot been hitherto described or figured in a detailed manner. 



The globiferous pedicellarise (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 

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

 valves (PI. XVII. Figs. 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 



