ECHINOIDEA. II. 



117 



large subanal tubefeet, the first on the 6th plate; the subanal Fasciole passes over the 10— nth ambu- 

 lacral plate). The pedicellarise have been described and partly figured by Koehler (Ech. des Cotes de 

 Provence) but not in a sufficiently detailed manner. Recently Professor Doderlein (Op. cit. p. 2551 has 

 given a short, but correct description of the pedicellariae. It is, however, not accompanied by figures, 

 so that I think it will not be found superfluous, when I give here a fuller description and figures of 

 these pedicellarise. — The globiferous pedieellariae have the terminal opening of the valves surrounded 

 by a circle of teeth, generally 3 on each side, and outside these one or two more on each side (PI. XIV. 

 Figs. 8, 40). The blade is almost equally wide in its whole length; the gland-space in the interior 

 reaches down to the articular surface. The rostrate pedicellarise (PI. XIV. Fig. 26) have long and slender 

 valves; the edges are inrolled, sometimes with a few serrations. The point of the blade with ca. 6 

 teeth, not widened (in the larger ones). At the peristome rather large specimens of these pedicellarise may 

 occur (ca. o-6 mm head), with the neck well developed; rostrate pedicellarise may occur more numerously 

 on the anal area, but these are upon the whole much smaller, with the point of the blade a little 

 widened (PI. XIV. Fig. 19), and without distinctly developed neck. As a whole the rostrate pedicellarise 

 are rather poorly developed; the tridentate pedicellarise are the more prominent (PI. XIV. Figs. 22, 41, 45) 

 In the simplest form the blade is leafshaped, the edges joining in their whole length, finely serrate. 

 This form is generally quite small. In larger specimens the valves become more and more apart, the 

 free edge being more or less regularly and coarsely serrate; the blade is here quite narrow and flat. 

 In the extreme form the valves join only with the very point. These large pedieellariae (head up to a 

 little more than i mm ) have generally four valves (as figured by Koehler. Op. cit. PL VII. 55), but 

 specimens with three or even with five valves may be found. (This is, I think, together with the 

 5-valved tridentate pedicellaria of Salenia hastigcra figured by Doderlein (Op. cit. PI. XLV (XXXVII) 

 3. i) the only case of 5-valved pedicellarise made known as yet; a case of 8-valved pedicellarise is de- 

 scribed sub Brissopsis lyrifcra). The triphyllous pedicellarise without prominent features, like small 

 tridentate ones. — The spicules (PI. XIV Fig. 34) are very small, irregular plates; they are found only 

 near the sucking disc and are arranged rather regularly in 4 longitudinal series. The rosette-plates of 

 the frontal pedicellarise well developed, reaching the point of the lobes. 



This species is known only from the Mediterranean; only in Rathbuu's Catalogue (337) 

 p. 291 it is mentioned from the American Coast of the Atlantic (40 02' N. 70 37' W. 101 fathoms). Pro- 

 fessor Rathbun has done me the very great service to send me this specimen for examination. I 

 find it to be S. orbiguyanus. 



Sell. orbig)iya>ius is figured and described by Professor Agassiz in the « Blake -Ech. p. 76. 

 PL XXVIII. Agassiz points out that there is a considerable difference between the specimens from 

 the Caribbean Sea and those from the northern coasts (off Marthas Vineyard), the peripetalous fasciole 

 being «much broader in the northern form. His fig. 5 probably represents the northern form (in any 

 case it agrees with the specimen from off Marthas Vineyard, which Professor Rathbun has sent me 

 for examination), and the Fig. 2 probably the southern form. Judging from these figures it is not 

 especially the breadth of the fasciole in which they differ, but more in its shape. In the northern form 

 it is narrow in the anterior part, from the point of the anterior petals ; the median part of the fasciole 

 is thus much broader than its anterior part. In the southern form it is broadest in front, passing 



