ECHINOIDEA. II. 



Very little has to be added to the careful descriptions of the test of this species given by Bell 

 and, especially, by Koehler. -- The labrum is very short, not reaching beyond the middle of the first 

 adjoining ambulacral plates (PI. II. Fig. 15), a prominent difference from flcmescens, in which species 

 it reaches the second ambulacral plate. (This feature is well seen in Koehler's Fig. n. PL IV (Op. 

 cit. Monaco) but not mentioned in the text; the division of the plate I. a. i in two small plates, shown 

 in this figure, is an abnormal case). The subanal fascicle according to Bell (Catalogue, p. 171) seems 

 to include only one pair of plates, which are triangular in form and have a pair of pores at the outer 

 apex of each triangle*. Koehler (Op. cit PI. IV. 10) figures two pairs of pores. Both cases may occur, 

 but whether there be one or two pairs of pores included, three ambulacral plates reach within the 

 fascicle, viz. Nr. 6 8; the last of them may reach scarcely beyond the fascicle - - in that case only 

 one pair of pores is developed within the fascicle, or it may reach farther within -- then also the 

 second pair of pores is developed. The periproct has a circle of larger plates all round, not only at 

 the lower edge as in the other species. 



The tube-feet of the anterior ambulacrum within the fascicle are quite rudimentary, only very 

 few of them or even none at all with a few rosette-plates, - - a rather conspicuous difference from 

 fla-vescens and capense, which have these tubefeet well developed. Accordingly the pores of these am- 

 bulacral plates are very small. The spicules are few and small, irregular rods; often none at all are 

 found in the tube-feet The very large spicules .below the disk, so characteristic of Ech. cor datum, are 

 not found here. The subanal tube-feet with the usual clubshaped rods. The rosette-plates, when pre- 

 sent, like those of flavescens. -- According to Koehler (Op. cit. Monaco, p. 26) the tubercles within, 

 the internal fascicle diminuent a mesure qu'on se rapproche de la ligne mediane. I find the inverted 

 case, that they increase in size towards the median line, and the same is seen in Koehler's PI. IV. 

 Fig. 9 and especially in the fig. 15 of Sur les Echinocardium de la Meditefr., so that there is evidently 

 a lapsus calami here. Otherwise these larger tubercles continue along the anterior ambulacrum, beyond 

 the fascicle towards the ambitus and gradually pass into the larger tubercles of the actinal side. But 

 no larger tubercles are found scattered on the antero-lateral interambulacra on the abactinal side -- a 

 very good character by which to distinguish this species from flavescens. - In two of the specimens 

 before me the test is distinctly unequally developed, the right side projecting in front of the left. 

 (PL II. Fig. 15, 17). 



The pedicellarise have received some attention, being partly very conspicuous. Thus the large, 

 strongly serrate, tridentate pedicellarise were seen by Norman and have given rise to the name pen- 

 natifidum. Hodge (Op. cit.) figures the valves of three forms of pedicellarise, viz. a large, slender form 

 of tridentate pedicellariae, a short, coarsely dentate (the rostrate) and a small, simply leafshaped form, 

 thought to be the immature form of the former. Koehler describes and figures (PL VIII. Figs. 40 

 42) three forms of pedicellariae, viz. a large tridentate pedicellaria with strongly serrate edges, a 

 smaller form, equally strongly serrate (rostrate?) and a third form which must certainly be a globiferous 

 pedicellaria. I have found all these forms and further triphyllous pedicellarise, whereas ophicephalous 

 pedicellariae have not been met with in any of the specimens seen by me. 



The globiferous pedicellarise (PI. XVII. Figs. 18, 29) are not very copiously represented; only in 

 one of the 8 specimens examined have I found a single one on the abactinal side. In Professor 



