62 ECHINOIDEA. II. 



Regarding the internal anatoiny it mav be pointed out that tliere is a double sipho, tlie outer 

 onc rather widened at its aboral end (PI. VII. Fig. 14); the bhud diverticuhim is well developed, lobate 

 (PI. VII. Fig. 2, 41. The course of the stene canal (PI. \'II. Fig. 2) as in Urechinus varesianiis. The axial 

 organ is seen as a small .swelling near the upper end of the stone canal |P1. \'II. Figs. 3,121. (The 

 fio-ures of the internal anatomy of Ponrtalesiæ given in the Challenger -Echinoidea only 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 irregnlarh- folded (PI. VII. P'ig. 11); the male organs are of the usual bush-shajje, with an unusually 

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

 testine. Genital papillæ are well developed, sometimes e\en very long (ca. 8"""). The genital openings 

 are not developed in specimens of 18 — 20"" length; in a specimen of 22""" they are developed. 



The smallest specimens in hånd (18—20™™) do not differ essentialh' 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 b\- the < Ingolf at the foUowing stations: 



St. 103 (66° 23' Lat. N. 8° 52' Long. \V. 579 fathoms -^ o°6 C. Bottom temp. 



— 113 (69° 31' — 7° 06' — 1309 — -4- 1^0 — 

 -116 (70° 05' — 8° 26' — 371 — -^o°4 — 



— 117 (69" 13' — 8° 23' — 1003 — -^ i°o — 



— 119 (67° 53' — 10° 19' — lOIO — H- i°o — 



— 124 (67° 40' — 15° 40' — 495 — -^o°6 — 



— 126 (67° 19' - 15° 52' — 293 - ~ o°5 - 



— 138 (63° 26' - f 56' - 471 _ ^ o°6 - 



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

 Channel to Spitzbergen, Novaja Zemlja ( Knipo vitsch. Op. cit.) and Kast Greenland (Kolthoff. 

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

 It is further recorded from the Ba\- 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 Pourtalcsia Wandtii, described below, or to P. miranda A. Ag. 

 Among the specimens of Pourtalesia from the warm area of the x^tlantic dredged by the Ingolf 

 there is no P.Jeffreysi (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. Jefreysi — as far as they are not so badl\- broken that it is impossible to identify them with au}- 

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

 Catalogue, loc. cit). The specimens more tolerabh- preserved seemed to me to be all P. Wandelt; but 

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

 after the short examination which I could uudertake there, to say witli certainty to which species 

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

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

 must be emphasized that at the present time /'. Jcffrcysi is not known with certaintx' from the warm 



