ECHINOIUKA. 11. ,y 



poms. The apical system differs from that of i^rdiniiporns in the ocular jjores beiii"; much smaller than 

 the genital pores as is the case in pnsilliis. The niadreporic plate is generally larger than in i^nindi- 

 ponis. otherwise it is elevated as in that species and the genital pores are likewise covered with long 

 genital papillae. Also in this species I have seen one specimen with 5 distinct genital pores. The pe- 

 tals are very slighth' developed, even scarcely so innch as in i^raiidiporus, as seen by the following 

 table. The genital pores I find developed in the specimen of 4""", while in that of 4-2""" thev have 

 not yet appeared and in the specimen of 4-8""" (the one figured) only the anterior pair is developed. 



As regards the arrangement of the actinal pores, the tnberculation, the structure of pedicellaria; 

 and spines as well as the internal structure of the test I do not find any reliable differences from grandi- 

 porus. (PI. XII. Figs. 2 and 7 represent an ophicephalous and a triphyllous pedicellaria of this species.) 



The colour of the living animal is, according to the sketch made on board the Valdi\ia , 

 green; there are ten darker radiating bands, answering to the bands of tube-feet, the intermediate 

 spaces having a slight yellowish tint; around the peristome there is a darker pentagon, radiatnig a 

 little into the ambulacra. 



Number of pairs of pores in lichino- 



To this species belongs the specimen referred to Echinocya- cyamus macrostomus. 



inus piisillns from the German Deep-Sea Expedition, St. 37, 1694 m. 

 (off Cape Verde. Doderlein op. cit. p. 234), and the two sijecimens 

 from the Travailleur 2100 in., which I received from the Paris- 

 ]\Iusenin. p-nrther, among the specimens sent me bv Profes,sor 

 Koehler two specimens from 37'" 54' L,at. N. 27" 3' Long. W. 2178 m. 

 (off the Azores), three specimens (the Azores, 1360111.), one living speci- 

 men and some dead tests from 32° Lat. N. 16° Long.W. 2286 m., and one 

 specimen from 39' Lat. N. 32° Long.W. i6<X) 111. belong to this species. — 

 The species is then evidently a more ab\ssal species than graiidiporiis. 



I have been in considerable doubt as to whether this form ought to Ije established as a sepa- 

 rate species or not. It is beyond doubt that it is ver\- closely related to Ech. graitdiporiiSy from which 

 species it is distingui.shed only by the small size of the ocular pores and the large size of the ])eri- 

 stome, other small differences being too inconstant to be relied upon as specific characters. The 

 two features pointed out are, however, so conspicuous and so far as my experience goes constant, 

 that it seems quite necessar\' to keep this form separate, as the bath\metrical distribution seems also 

 to indicate its specific difference from s^raiidiponts. Otherwise it is evidently of no great importance 

 whether it is regarded as a variety only of the latter species or as a separate species; the main thing 

 is that it should not be merely confounded with the typical gniiidiponis — not to mention piisillus 

 with which it was hitherto confounded, but to which it is not so iiearl}' related. 



Perhaps }et another species of Echiiiocyaiiiiis will prove to occur in the Atlantic. Among the 

 specimens from the Josephina and among those from the Azores sent me by Professor Koehler 

 there are a few small specimens, which look rather different from the other species. They agree with 

 pusilliis in the shape of the test, the small size of the ocular pores and in the petals. But the pri- 

 mary tubercles are larger than is generalh' the case in pusillus, and the scrobicular area is more 

 deepened. P'urther, it iiia\- be noticed that the tubercle is placed excentrically at the anterior side of 



