116 



mation received from Prof. Bell in a letter lo me. Trusting to this statement de Meijere 

 has concluded that G. darnleyensis has the a|)ical system „sehr schief ausgebildet", 

 and on this account he has referred some specimens from the .,Siboga"-Expedition to that 

 species. Now I must state, after having reexamined the specimens of G. darnleiiensis in 

 the British Museum during my visit there last summer, that all the ocular plates are, 

 indeed, excluded from the periproct, the apical system being regular and very different 

 from the oblique apical system in G. Robillardi and pulchelhis. Seeing thus that the 

 „Siboga'-specimens could not belong to darnleyensis, I asked Dr. de Meijere to send 

 me some specimens for examination. He most kindly sent me two specimens; 

 they prove to be nearly related to G. pulchellus. They are somewhat larger than 

 the largest Siamese specimens (23 mm. diam., 11 mm. height and 18'5 mm. diam., 

 105 mm. height) and the form of the test is somewhat different being higher at the 

 ambitus and more flat on the abactinal side than in the larger specimens of pul- 

 chellus; the smaller specimen agrees with the Siamese specimens in colour, the 

 spines only being of a more violet tint: the larger specimen has the abactinal 

 spines faintly greenish, indistinctly banded, the actinal ones are a little violet, and 

 there is a faint greenish tint on the test towards the apical system. The tridentate 

 pedicellariæ do not quite agree with those of the Siamese specimens. In the smaller 

 specimen the lower part of the blade is not so narrow, and the holes in the outer 

 part are conspicuously lengthened; in the larger specimen they are, again, of an- 

 other form, more leafshaped, broadest in the middle, and the edge of the lower 

 part strongly serrate; the holes are small and round. It thus seems doubtful, whether 

 they can be referred to G. pulchellus; they even seem to be two different species. 

 But a larger material is needed for establishing the constancy of these features 

 before the specimens can be made separate species. 



Some specimens from Macclesfield Bank, mentioned by Bell') as Temno- 

 pleuius Reynaudi (and some more specimens from the same locality found in the 

 British Museum, only named „Echinus') prove to be a new species of Gymnechinus, 

 allied to G. pulchellus, which I may describe here as Gymuechinus versicolor n. sp. 



The test is very low, faintly conical on the abactinal side, with the mouth-edge 

 rather strongly incurved. The tuberculation is rather rich. In both areas there is a 

 larger secondary tubercle in the inner edge of the plate, forming a somewhat irregular 

 longitudinal series. In the interambulacra the secondary tubercles form a rather distinct 



') Kchiuoderms of Macclesfield Hank. p. 410. 



