146 



ECHINOIDEA. II. 



Agassiz (Rev. of Ech. PI. XXV. 27 28). Globiferous, rostrate, tridentate and triphyllous pedicellarias 

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



The globiferous pedicellarice (PI. XVII. Figs. 37, 49) are very conspicuous, with a thick, brownish 

 head; the valves are very short, with a very large basal part and a short, tubeshaped blade, which 

 has 56 teeth along each side of the elongate terminal opening and often an outer median one. The 

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

 cellarise 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 thus represented: in one specimen 

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

 them, at the mouth or on 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 globiferous pedicellarise at all - 



Fig. 24, a c. Anal and subanal region of Echinocardium core/alum: a speci- 

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



in these latter specimens, on the other hand, the trideutate pedicellarise seem comparatively more 

 richly developed than usually. 



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

 still more like tridentate pedicellarise; the blade generally is somewhat pointed, and may have a pro- 

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

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

 cellarise (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 

 irregularly serrate; there is generally some mesh work in the bottom of the blade in these larger pedi- 

 cellarise. In the specimens from Tamaris I "find the tridentate pedicellarise unusually broad (PI. XVII' 

 Fig. 30). The largest ones seen were ca. i'5 mm , length of head. -- The triphyllous pedicellarise (PI. XVI. 

 Fig. 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 pedicellarise unknown. 



This species, which was not taken by the '<Ingolf, is very common 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 



