I^o ECHINOIDEA. II. 



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

 and, especially, by Koeliler. — The labrum is very short, not reaching beyond the niiddle of the first 

 adjoining ambnlacral piates (PI. II. Fig. 15), a prominent difference iroiw flavescens, in which species 

 it reaches the second ambulacral plate. (This feature is well seen in Koehler's Fig. 11. PI. IV (Op. 

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

 in this figure, is an abnormal case). The subanal fasciole according to Bell (Catalogne. p. 171) •i^seems 

 to include only one pair of piates, 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 piates reach within the 

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

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

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

 the lower edge as in the other species. 



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

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

 flavesccns and capcnse, which have these tubefeet well developed. i\ccordingly the pores of these am- 

 bulacral piates 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 Ecli. cordatum, are 

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

 sent, like those oi Jlavescens. — According to Koehler (Op. cit. Monaco, p. 26) the tubercles within 

 the internal fasciole vdiminuent å mésure qu'on se rapproche de la ligne médiane«. I find the inverted 

 case, that the\- 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 Méditerr. >, so that there is evidently 

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

 the fasciole 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 flavesccns. — In two of the specimens 

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

 (PI. II. Fig. 15, 17). 



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

 strongly serrate, tridentate pedicellariæ were seen by Norman and have given rise to the name /tv,!- 

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

 of tridentate pedicellariæ, 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 (PI. VIII. Figs. 40 

 —42) three forms of pedicellariæ, 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 aud further triphyllous pedicellariæ, whereas ophicephalous 

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



The globiferous pedicellariæ (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 



