258 Th. Mortensen. 



Poraniomorpha (Rhegaster) tumida Grieg. 1909. Duc d'Orléans, Croi- 

 sière Océanographique de la Belgica 

 dans la mer du Grönland. 1905. In- 

 vertébrés du Fond. p. 554. 



I quite agree with Östergren (Zoolog. Anzeiger. XXVII. 1904. 

 p. 615) and Grieg (Op. cit.) that the genera Rhegaster and Lasiaster 

 should be united with Poraniomorpha, or at least that the species 

 Rh. Murrayi and Lasiaster hispidus must be referred to that genus. As 

 to whether the two genera mentioned may perhaps be maintained for 

 some of the other species referred to them, I am not prepared to 

 say anything at present. (Recently S. Süssbach & A. Breckner, 

 "Die Seeigel, Seesterne and Schlangensterne der Nord- und Ostsee", 

 p. 217. Taf. I. Figs. 4 — 6, describe a new species, Calcita borealis, 

 founded on a specimen from North of the Shetland Islands, which 

 appears to me to be only an unusually swollen specimen of Pora- 

 niomorpha hispida (Sars). I have seen specimens of both the latter 

 species and of Porania pulvillus (O. F. Mull.) swollen in a similar 

 way, or even still more). 



Grieg has called attention to the fact that the "paxillæ" of 

 this species described by Da nielssen and К or en, and also by 

 Levinsen, are not true paxillæ; they must be termed spinelets. 

 On the other hand, the figure of such a spinelet given by Grieg 

 does not seem to me very satisfactory (as is also the case with 

 those given by Danielssen & Kor en), so I have taken the occasion 

 to give a pair of figures thereof (PI. XVI. Figs. 6—7). As it appears 

 here the basal part of the spinelets is somewhat widened and con- 

 sists of an open, irregular network, very different from the upper 

 part of the spinelet. These short spinelets standing erect, close 

 together, quite resemble a fine granulation, as it is characterized 

 by Döderlein. Those of the oral side (PI. XVI. Fig. 7) are slightly 

 longer and more slender, but otherwise constricted as those of the 

 dorsal side. They are not erect as those of the dorsal side, there- 

 fore not producing the aspect of granulation. 



Station 104 (76° 6' N. 13° 26' W^.). 200— 250 m. 1 specimen. 



7. Cribrella sanguinolenta (O. Fr. Müller). 



Echinaster oculatus Dub en & Kor en. 1844. Öfvers. af Skan- 



dinav. Echinodermer. p. 241. 



Cribrella sanguinolenta Lütken. 1857. Grønlands Echinodermata. 



p. 31. 



Echinaster sanguinolentus Sars. 1861. Norges Echinodermer. p. 84. 



Cribrella oculata Duncan & S lad en. 1881. Memoir. Ech. 



Arctic Sea. p. 32. PI. II. Figs. 18-21. 



