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4- Alepas ovalis n. sp. PI. IV, fig-. 17 and 18. 



A sino-le specimen of a species of the genus Alepas different from the known species 

 was taken by H.M.S. "Siboga" at Station 267. According to the label the specimen was found 

 attached to the spines of Porocidaris elegans, on which the specimens of A. mortcla were 

 also found. It differs from that species at first sight i" by its form which is more regularly 

 rounded oval ; 2" by the absence of the tubercles on the surface ; 3" by the somewhat larger 

 orifice of the capitulum ; and 4" by the shorter and more cylindrical peduncle. When I received 

 it, the specimen was no longer attached to the Echinid-spine (as was the case with the specimens 

 of A. moinda)\ so 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, I think, from the 

 figures 17 and iS of PI. IV. The length of the capitulum and the peduncle together is nearly 

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

 the chitinous membrane. 



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

 A. japonica 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 

 do so without destroying the .specimen. 



The specimen was taken at : 



Stat. 267. December 20, 1899. Lat. 5° 54' S., Long. I32°56'.7E. Depth 984 m. Bottom: grey 

 mud with a brown upper layer. 



As I 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 one reason 

 why I think identity with A. japonica highh' improbable. 



4. Alepas temds 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 one specimen and it is very small — whether full-grown or not 

 I am unable to decide. It resembles Alepas Lankesteri Gruvel 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 (PL IV, fig. 19), 

 the total length of which is 6,4 mm. ; the figure will, I hope, enable this form to be recognised, 

 should it again be found. 



It was taken at ; 



Stat. 251. December 8, 1899. Lat. 5°28'.4S., Long. i32°o'.2E. Depth 204 m. Bottom: hard 

 coral sand. 



General Remark. I do not think it a good custom in general to describe such forms 

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

 discussing the geographical distribution and the bathymetric range of the known species of the 



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