ECHINOIDEA. I. 125 



evident; these three sjDecies must form a separate o;enns which gets the name of Toxocidaris Ag.'), 

 As the first species of this genus (of which 110 diagnosis is given) is nanied T. Dclalandi Ag., whicli 

 is synonymous with crythrogranni/jis (Rev. of Ech. p. 163); thus this species becomes the tyj^e of the 

 genus Toxocidaris. Agassiz is surely right when he maintains (Rev. of Ech. p. 450) that the .some- 

 what petaloid structure of the pore areas on the actinal side is no vahd generic character of Toxo- 

 cidaris^ l:)ut the pecuHar globiferous pedicellariæ leave no doubt of the correctness of the genus with 

 the Hniitation given here. 



As a synonym of ■ Sirongyloc.i tubcrculatiis Agassiz (Rev. of Ech. p. 165) names Ai/lhocidans 

 //oii/alosioi/ia Liitken'). I am so fortnnate as to be able to prove this to be incorrect. The specimens 

 of Liitken are only naked tests, of which one is from China, for the others no locahty is given. 

 Among the Echinids from Japan, sent me by Prof. d'Arcy Thompson, is a specimen, which with 

 regard to the structure of the test agrees so exactly witli the specimens of Liitken, that there can 

 be no doubt of their being identical. So I shall here give tlie necessary informations of this species. 

 The specimen in hånd has a diameter of 30""", and is from Yokohama Bay. The primary tubercles of 

 the ambulacral areas are ahnost as large as the interanibulacral primary tubercles. There is an 

 irregular series of small tubercles in the middle, and a siniilar one outside of the primary series on 

 either side; this outer series is formed of a larger and a smaller tubercle alternately, a larger tubercle 

 being found below on each am]:)ulacral plate, and a smaller one above; bcsides some small tubercles 

 are found outside the latter oues, uearer to the pores. The interanibulacral areas have a double series 

 of secondary tubercles between the primary series, and one outside on either side; just at tlie ambitus 

 two series are found outside of the primary ones, and all these tubercles form here distinct oblique 

 series. The colour of the test is gra\'ish green. The spines are thick, evenly tapering, the longest 

 half as long as the diameter of the test; they are of a deep violet colour. Two ocular piates reach 

 to the periproct. The pore areas are rather highly petaloid on the actinal side, and as only a few small 

 spines are found nearest to the mouth, almost only tube feet are seen here. In the lower ambulacral 

 piates only 3 pairs of pores are found, abo\-e there are 8 — 9 jjair-s. The buccal membrane contains 

 rather numeroiis fenestrated piates, of which some of those outside of the buccal piates are thick and 

 carry pedicellariæ. The gills contain the conmion irregular fenestrated piates. The slits distinct. The 

 globiferous pedicellariæ are as in SfroiigYloc. drohacliirusis with well developed neck (in the specimen 

 in hånd I succeeded only with much difficulty in tinding one small globiferous pedicellaria). The tri- 

 dentate pedicellariæ (PI. XXI. Fig. 6) resemble much the narrow form in Toxocidarh iuberculaius; but 

 also another form is found with the blade somewhat widened in the point, and with a more developed 

 net of meshes. As I have not been able to find a whole specimen of this form , I have given no 

 figure of it, so much the less as its seems that no great stress can be laid on the tridentate pedicel- 

 lariæ as specific characters in most of the Stroiigylocciitrofus-\\\^e forms. Xo transverse series of small 

 teeth are found on the edge. The ophicephalous and triphyllous pedicellariæ of the common form. 

 The spicules of the tube feet are very characteristic |P1. XXI. Fig. 30), <biacerate>, a little curved, 

 generalh' with a rather strong point in the middle of the oitter side. 



1) List of Echinodeniis etc. Bull. Mus. Conip. Zool. I. p. 22. 



2) Bidrag til Kundskab om Kchiniderne. p. g6. 



