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n sp. PI. IV, fig, 1 7 and 1 8. 



\ sin cimen of a species of the genus Alepas differenl from the known 



taken bj H.M.S. "Siboga" at Station -"'7. Vccording to th<- label the specimen was found 



hed te the spines of / ijk, on which the specimens <>l" ./. morula were 



nd. lt differs trom tli.it species at first sighl 1 " by its form which is more regularly 



ded oval; 2' by the absence of the tubercles on the surface; ;' by the somewhal larger 



orifice of the capitulum; and ( by the shorter and more cylindrical peduncle. When 1 received 



it. th<- specimen was ii" longer attached to th<- Echinid-spine as was the case with the specimens 



• that the peduncle may have been longer in reality 



The shape of the capitulum, the not very distinct crest at its carinal edge, the way in 



which the capitulum is separated from the peduncle can be best judged, 1 think, from th<- 



figures 17 and 18 "f' PI. IV. lh<- length of the capitulum and the peduncle together is nearly 



1 1 mm., the capitulum alone measuring about 8 mm. Scuta absent or entirely hidden under 



chidnous membrane. 



TIn- species to which this specimen belongs has no doubt a certain resemblance to 

 'aponica Auriv., but I do not believe it can be identical with it. Only dissection and full 

 investigation of the parts of the mouth, the legs etc. might settle this — but I feel unable to 

 so without destroying the specimen. 

 The specimen was taken at: 



Stat. 207. December 20, [899. Lat. 5 54 S., Long. 13256.7 IC. Depth 984 m. Hottom: grey 

 mud with a brown upper layer. 



As 1 have pointed out already in the introduction to the genus Alepas, of all the known 

 species this form, next to A. Lankesteri, inhabits the greatest depth. This is also wie reason 

 why 1 think identity with ./. j aponica highly improbable. 



4. Alepas tennis n. sp. PI. IV, fig. 19. 



Still another species of the genus Alepas is represented in the collection of H. M. S. 

 "Siboga". There is again only <>ne specimen and it is very small — whether full-grown or not 

 1 am unal.le to decide. It resembles Alepas Lankesteri (ïruvel to a certain extent yet it is 

 much smaller and the resemblance might on closer examination turn out to be superficial only. 



Like Alepas Lankesteri the capitulum is devoid of scuta and furnished with a continuous 

 ridge extending from the orifice to the peduncle. I have figured the little animal (PI. IV. fig. 19), 

 the total length of which is 6.4 mm.-, the figtire will. I hope, enable this form to be recognised, 

 should it again \><- found. 



It was taken at 



Stat. 251. December 8, [899. Lat. 5 js .4 S.. Long. 13J o.jIC. Depth 204 m. Bot torn: hard 

 coral sand. 



Gi neral Remark. 1 do not think it a good custom in genera! to describe such forms 

 5, of which it is impossible to give a full description for want of material. When 

 eographical distribution and the bathymetric range of the known species of the 



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