ECIIINOIDEA. II. 117 



large subanal tubefeet, the first on tlie 6tli plate; the subaiial fascicle passes over the 10 nth anibii- 

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

 Provence) but not in a sufficiently detailed numner. Recently Professor Doderlein (Op. cit. p. 255) has 

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

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

 these pedicellariae. — The globiferous pedicellaritc have the terminal opening of tlie 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 pedicellaria; (PI. XI\\ 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 pedicellariae may 

 occur (ca. o-6'"'° head), with the neck well developed; rostrate pedicellarise may occur more numerou.sly 

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

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

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

 In the simplest form the blade is leafsliaped, 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 pedicellariae (head uj) to a 

 little more than i""") have generally four valves (as figured by Koehler. Op. cit. PI. 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 Saloiia Jiastigcra figured by Doderlein (Op. cit. PI. XLV (XXXVII) 

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

 scribed sub Brissopsis lyrifera). The triphyllous pedicellariae without prominent features, like small 

 tridentate ones. — The spicides (PI. XIV. Fig. 34) are very small, irregular plates; they arc 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 onh- from the Mediterranean; onl\' in Rathbun's Catalogue (337) 

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

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

 find it to be S. orbignyamis. 



Sch. orbignyaiius is figured and described by Professor Agassiz in the «Blake>-Ech. p. 76. 

 PI. 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 fascicle 

 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 fascicle 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 fascicle 

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



