6 2 ECHINOIDKA. II. 



Regarding the internal anatomy it may be pointed out that there is a double sipho, the outer 

 one rather widened at its aboral end (PI. VII. Fig. 14); the blind diverticulum is well developed, lobate 

 (PI. VII. Fig. 2, 4). The course of the stone canal (PI. VII. Fig. 2) as in Urechinus naresianus. The axial 

 organ is seen as a small swelling near the upper end of the stone canal (PL VII. Figs. 3, 12). (The 

 figures of the internal anatomy of Pourtalesise given in the Challenger -Eehinoidea onlv show the 

 course of the intestine and the shape of the genital organs; the diverticulum, the siphones, stone-canal 

 and axial organ are not represented). The genital organs show the curious feature of being very dif- 

 ferent in shape in the two sexes. The female genital organs are long thick tubes, quite unbranched, 

 but irregularly folded (PL VII. Fig. ii|; the male organs are of the usual bush-shape, with an unusually 

 long efferent duct (PL VII. Fig. 12). No spicules are found in the walls of the genital organs or in- 

 testine. Genital papilla; are well developed, sometimes even very long (ca. 8 mm ). The genital openings 

 are not developed in specimens of 18 — ao""" length; in a specimen of 22 mm they are developed. 



The smallest specimens in hand (18— 20 n,m ) do not differ essentially in the shape of the test 

 from the grown specimens, they are only somewhat more slender. The abactinal keel is distinct, but 

 is less produced over the periproct than in the grown specimens. 



Considerable numbers of this species were taken by the Ingolf at the following stations: 



St. 103 (66° 23' Lat. N. 8° 52' Long. W. 579 fathoms -r- o 3 6 C. Bottom temp.) 2 specimens. 



The species is distributed all over the cold area of the Norwegian Sea, from the Faeroe 

 Channel to Spitzbergeu, Novaja Zemlja ( Kuipo v i t sch. Op. cit.) and East Greenland (Kolthoff. 

 Op. cit.). The bathymetrical distribution is from ca. 125 (Doderlein. Fauna Arctica) to ca. 1300 fathoms. 

 It is further recorded from the Bay of Biscay (Norman, op. cit.) and from the American side of the 

 Atlantic (Rathbun, Verrill. op. cit.). The specimens upon which these indications are founded, will 

 probably turn out to belong to the Pourtalesia Wan deli, described below, or to P. miranda A. Ag. 

 Among the specimens of Pourtalesia from the warm area of the Atlantic dredged by the Ingolf 

 there is no P. Jeffreys! (with regard to a few small specimens from St. 40, 67 and 68, comp. below, p. 68), 

 and some specimens which I examined in the U. S. National Museum are likewise certainly not 

 P. Jeffreys/' - as far as they are not so badly broken that it is impossible to identify them with any 

 probability (which was exactly the case with the specimens from St. 2084, mentioned in Rath bun's 

 Catalogue, loc. cit). The specimens more tolerably preserved seemed to me to be all P.Wandeli; but 

 in view of the uncertainty prevailing with regard to P. miranda (comp. below p. 65 — 66) I do not venture 

 after the short examination which I could undertake there, to say with certainty to which species 

 they belong. I only want to state that I have seen no true P. Jeffreys/ among them. The same holds 

 good for several specimens, which Professor Verrill kindly let me examine. — Upon the whole it 

 must be emphasized that at the present time P. Jeffreys/' is not known with certainty from the warm 



