ECHINOIDEA. II. 



141 



Koehler's specimens they were evidently more numerous. The valves have a very wide basal part; 

 the blade is a short, narrow tube, with a small terminal opening surrounded by some short teeth, 

 5 6 on either side; the point is straightly cut The difference between the globiferous pedicellarise of 

 this species and flavescens is very conspicuous. 



The rostrate pedicellarise (PL XVII. Figs. 20, 28, 32, 44) are very richly developed. The simpler 

 forms are very like those of Spatangus, recalling somewhat, as pointed out by Koehler, the ophice- 

 phalous type of the Echinidce, with which they have, however, nothing to do. The blade is in these 

 forms simply rounded, the narrowed part being very short, with quite smooth edges (PL XVII. Figs. 

 32,44); the edge of the widened part is finely serrate. Other specimens have a larger narrowed part, 

 the edge generally being provided with one or more very large teeth (PL XVII. Figs. 20, 28). The 

 larger of these forms are like the tridentate pedicellarise, only shorter - - indeed, it is impossible in 

 this case to draw a definite distinction between rostrate and tridentate pedicellarise. The larger ones 

 of these pedicellarise are ca. i mm (length of head); they have a well developed neck, and the stalk, as 

 usual in Echinocardium, consists of long, very loosely connected fibres. They occur both on the actinal 

 and abactinal side. -- Also small specimens are found, which are more like the usual type of rostrate 

 pedicellarise. 



The tridentate pedicellariee occur in two very distinct forms, viz. a large form (up to 2'5 mm length 

 of head) with strongly serrate edges (PL XVII. Figs, i, 33), and a more slender form with narrow, leaf- 

 shaped valves, joining in most of their length; in the part where the valves join, the edges are very 

 finely serrate, in the lower part the serrations are coarser (PL XVII. Figs. 25, 26, 42); in some specimens 

 the valves are more slender and the serrations of the lower part larger (PL XVII. Fig. 24); this form 

 evidently corresponds to the PL VIII. 40 of Koehler. Otherwise all transitional forms are found be- 

 tween these two forms. The basal part is very narrow. Fourvalved specimens occur. This form, which 

 has already been figured by Hodge (Op. cit.) does not reach the size of the first form, it scarcely 

 exceeds i'5 mm length of head. The triphyllous pedicellarise (PL XVI. Fig. 18) are rather elongate, 

 with the whole edge, except the very point, finely serrate; the serrations increase a little towards the 

 point of the blade. 



On the younger stages of this species I cannot give much information, having seen besides 

 larger specimens only a specimen of 9 mm length and one of i8 mm length. In the latter the genital 

 pores have appeared, not in the former. The petals are distinct already in the specimen of 9 mm , viz. 

 4 double pores in the anterior, 10 in the posterior series of the anterior petals, 9 in both series of 

 the posterior petals. In the specimen of i8 mm the anterior series in the anterior petals is less developed, 

 having only one or two small double pores. 



This species is known from the British Seas, from the Fseroe Islands to the Bay of Biscay. 

 From the Danish Seas it was hitherto unknown , but recently Dr. A. C. Johansen has taken a 

 specimen (the above mentioned small one of 9 mm ) in 35 M. off Thyboron (Thor. IV. 1905). Evidently 

 the species is rare in our seas, otherwise it would scarcely have been overlooked. - - By the Ingolf 

 it was not taken, but I have myself dredged some specimens at the Faroe Islands in ca. 80 150 

 fathoms. (16 Miles W. of Nolso, and 13 Miles W. of Munken, a small rock at the South end of 



