84 



such a condition that no description of any value can be made" also seems to 

 indicate a confounding of notes on difTerent forms; the type specimen of bothryoides 

 is in excellent condition, and as Agassiz does not otherwise give much more than 

 descriptions of the tests, it seems difficult to understand, why this most characteri- 

 stic form could not be described from the test alone. — The colour of the test in 

 the type specimen is (now) grey, with a faint violet tint; it is not dark violet as 

 stated by Agassiz; perhaps it was so, when he examined it. 



The specimens recorded in the literature under the name of Pleurecbinus 

 bothryoides are not all really that species. The specimens from Kobi, Japan (Chall. 

 Ech. p. 109) probably belong to the species PL variegatus, described below; in any 

 case they are not bothryoides. The specimens from Chall. St. 186 are actually 

 bothryoides. Of the specimens mentioned under this name by de Meijere (Siboga- 

 Ech. p. 77) only three large specimens from Jedan (St. 273) are really bothryoides; 

 the rest are PI. maculatus, siamensis and scillœ (see above p. 81; .,Siboga"-Ech. 

 p. 202). The specimens from Thursday Island, Torres Strait, mentioned by Bell 

 (Echinodermata — „Alert" p .119) are really bothryoides, whereas the specimens from 

 Macclesfield Bank mentioned by Bell as Temnoplenrus bothryoides (Echinoderms of 

 Macclesf. Bank. p. 410) are PI. maculatus. (The .,Challenger"-specimens, as well as 

 those from Thursday Island and Macclesfield Bank I have examined in the British 

 Museum.) The Temnoplenrus cavernosus of Woods is probably this species. 



Pleurechinus ruber Döderlein. To the description of the test given by 

 DÖDERLEIN ') may only be added that the anal opening is central and that no 

 distinct anal plate is found. The spines are smooth, not swollen at the point; the 

 actinal spines are not widened at the point and not curved. The globiferous pedi- 

 cellariæ have no lateral teeth, only a rounded knob on one side below the endtooth; 

 the blade is very short, the basal part with sharp, but not produced, outer corners 

 (PI. VI. Fig. 28, PI. VII. Fig. 6). The ophicephalous pedicellariæ are like those of 

 bothryoides; triphyllous (and tridentate) pedicellariæ I have not seen; the triphyllous 

 ones will probably be like those of bothryoides, as is the case in PI. variegatus, with 

 which species it otherwise completely agrees as to pedicellariæ; tridentate pedicel- 

 lariæ probably do not occur at all. 



Pleurechinus variegatus n. sp. (PI. I. Figs. 5—6, 8, 19). The test is low (7 mm. 

 to 115 mm. in diameter, 11 mm. high to 17 mm. in diameter), beautifully rounded 

 above, a little curved inwardly at the peristome. The pits (in both areas) are 

 small, not reaching to the base of the primary tubercles, leaving thus a rather large 

 part of the horizontal suture not deepened; no covering membrane is seen round 

 the edge of the pits. The primary tubercles (of both areas) form distinct longitu- 

 dinal series, diminishing very little in size towards the apex and the peristome; they 

 are almost equally large in both areas. In larger specimens the tubercles are rather 



') Seeigel von Japan und den Liu Kiu-Inseln. p. 20. 



