^2 ECHINOIDEA. II. 



Reo-arding the internal anatomy it nia\- be jjointed out that tliere is a donble sipho, tlie outer 

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

 (PI. VII. Fig. 2, 4). The course of the stone canal (PI. \'II. Fig. 2) as in L'rrc/ii>/i/s Hdnsiaiiiis. The axial 

 organ is seen as a small swelling near the upper end of the stone'canal (PI. VII. Figs. 3, 121. (The 

 fio-ures of the internal anatomy of Pourtalesise 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 arc not represented). The genital organs show tlie curious feature of being very dif- 

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

 but irregularh- folded (PI. \'II. Fig. ii); the male organs are of the usual bush-shape, with an unusualh- 

 loutr efferent duct (PL \'1I. Fig. 12). No spicules are found in the walls of the genital organs or in- 

 testine. Genital papilUe are well developed, sometimes e\en ver\- long (ca. 8™™). The genital openings 

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



The smallest specimens in hand (18-20™™) do not differ essentialh' in the shape of the test 

 from the grown specimens, the\' are onl\- somewhat more slender. The abactinal keel is distinct, but 

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



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



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



— 113 (69" 31' — 7" 06' — 



— 116 (70^05' — 8" 26' — 

 -117(69^13' - S-^as' - 



— 119 (67=53' - 10° 19' 



— 124 (67° 40' — 15° 40' - 



— 126 (67° 19' — 15° 52' - 



— 138 (63° 26' - 7° 56' - 



The species is distributed all o\er the cold area of the Norwegian Sea, from the Fseroe 

 Channel to Spitzbergen, Novaja Zemlja ( K 11 i i)o vi tsch. Op. cit.) and East Greenland (Kolthoff. 

 Op. cit.). The batluiuetrical distribution is from ca. 125 (Doderlein. F'auna Arctica) to ca. 1300 fathoms. 

 It is further recorded from the l>a\ of Bisca\- (Norman, op. cit.) and from the American side of the 

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

 probably turn out to belong to the Ponrtalcsia Wmidcli, described below, or to /'. iiiinuida A. Ag. 

 Among the specimens of Ponrtalesiu from the warm area of the Atlantic dredged )>> the Ingolf^^ 

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

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

 /■*. Jrffreysi — as far as the\- are not .so badh broken that it is impossible to identify them with any 

 probability (which was exacth- the case with the specimens from St. 2084, mentioned in Rathl)Uii's 

 Catalogue, loc. cit). The specimens more tolerably preserved .seemed to me to l)e all I'.W'andcli: but 

 in view of tlie uncertainty prevailing with regard to P. inirdiida (comj). below p. 65 — 66) I do not venture 

 after tlie short examination which I could undertake there, to sav with certainty to wliich species 

 the\ Ijelong. I only want to state that I have seen no true P. Jcffrcysi among them. The same holds 

 good for several specimens, which Profes.sor V err ill kindly let me examine. — l'i)oii the whole it 

 must be emphasized that at the present time P. Jcffrrysi is not known with certaint> from the warm 



