146 



ECHINOIDEA. II. 



Agassiz (Rev. of Ech. PI. XXV. 27 — 28). Globiferoiis, rostrate, tridentate and triphyllous pedicellariæ 

 have been found; ophicephalous ones do not seem to occur. 



The globiferoiis pedicellariæ (PI. XVII. Figs. 37, 49) are very conspicuoiis, with a thick. brownish 

 head; the val ves are very short, with a very large basal part and a short, tubeshaped blade, whicli 

 has 5—6 teeth along each side of the elongate terminal opening and often an onter median one. The 

 stalk has a whorl of free projecting rods at its lower end; the npper end is attenuated. These pedi- 

 cellariæ I have found only on the actinal side, and only in specimens from the Mediterranean, never 

 in any specimen from the northern seas. In some specimens from Tamaris (Var), which Professor 

 Koehler has most kindly lent me for examination I find them thiis represented: in one specimen 

 (the largest) they are very niimeroiis and well developed; in foiir specimens there are very few of 

 them, at the moiith or 011 the anal area, and they are small, the basal part being not very large and 

 the whorl on the stalk little developed; in two specimens I find no globiferoiis pedicellariæ at all — 



Fig. 24, a — c. Anal and subanal region of Echinocardium cordaium: a speci- 

 men from Skagerrak; 6 from Roscoff; c from Naples. 



in these latter specimens, 011 the other hånd, the tridentate pedicellariæ seem comparatively more 

 richly developed than iisiially. 



The rostrate pedicellariæ (PI. XVII. Figs. 15, 21, 38) are rather like those of flavescens, only 

 still more like tridentate pedicellariæ; the blade generally is somewhat pointed, and ma\' have a pro- 

 minent tooth in the point. In some specimens from the Mediterranean I find sucli with the blade 

 miich narrower (PI. XVII. Fig. 34), recalling very miich those of Spatangus. — The tridentate pedi- 

 cellariæ (PI. XVII. Figs. 22, 23, 30, 43, 48) have leafshaped valves, in the smaller ones joining with their 

 whole edge; in the larger forms the blade is more or less narrowed in the lower part, the edge being 

 irregiilarly serrate; there is generally some meshwork in the bottom of tlie blade in these larger pedi- 

 cellariæ. In the specimens from Tamaris I find the tridentate pedicellariæ iinusually broad (PI. XVII* 

 Fig. 30). The largest ones seen were ca. i'5""", length of head. — The triphyllous pedicellariæ (PL XVI. 

 F'ig. 21) are very peculiar; in the outer part there is a series of broad teeth inside along the edge; the 

 serrations pass a little way up together with these teeth. In about the outer half of the blade the edge 

 is smooth. — Ophicephalous pedicellariæ unknown. 



Tilis species, which was not taken by the Ingolf , is very connnon in the Danish Seas, and 

 along the Atlantic coasts of Europe, from Northern Norway to the Mediterranean. It is not known 

 from the Faroe-Islands or Iceland. From the American .side of the Atlantic it is recorded from 



