542 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



strongly diverging, slightly curved backward, somewhat bluntly 

 pointed, about 200 fi long and 16 fi thick at base. 



Quadradiates of oscular margin (e) nearly similar to the triradiates 

 of oscular margin, except in the presence of short apical ray, which 

 is slightly curved upward and tapering from base to sharply pointed 

 end. In a large example of the spicule the basal ray measured 26 jjl 

 long by 8 [JL thick at base, and the paired rays 16 \t. long by 12 [x thick 

 at base. 



Oxea projecting from dermal surface (/) not very stout, rather 

 slender, straight or slightly curved, and nearly uniformly thick in 

 the greater part of their length, though tapering at ends, which are 

 finely pointed. The majority of these spicules are found broken. A 

 large fragment measured about 600 [;. in length and 8 [x in thickness. 

 The same spicules occur also in the oscular margin. 



Oxea proper to oscular margin (g) very slender, hair-like, nearly 

 straight or slightly curved, thickest nearer imier than outer end; 

 both ends finely pointed ; 280-600 /* long and 2-4 [x, thick. 



Locality. — Off Cape Kollin, Simushir Island, Kuriles (Station 

 4803, 229 fathoms). 



Remarks. — This new species may easilj'^ be distinguished from 

 Jenkin's species Achramorpha glacialis^ A. nivalis^ and A. grandi- 

 nis,^ by the presence of the gastral skeleton containing tangential 

 quadriradiates as well as by the absence of microxea. The species 

 differs from Topsent's Achramoi'pha truncata^ by the presence of 

 tangential quadriradiates in the gastral skeleton and by the differ- 

 ent share and size of the oxea which project from the dermal surface ; 

 and finally from Breitfuss's Achramorpha schulzei^ by the absence 

 of microxea and by the different shape of subgastral triradiates and 

 of gastral quadriradiates. 



8. LEUCANDRA TUBA, new species. 



Plate 84, fig. 3. 



This species is based on a single specimen found in the collection. 

 (Cat. No. 9184, U.S.N.M.) It consists of a mass of complexly anasto- 

 mosing tubes (pi. 84, fig. 3), partly blind and partly provided with 

 an osculum at the free end. The tubes are cylindrical or more or less 

 laterally compressed, and may be 5-10 mm. wide at their base, where 

 the wall is about 2 mm. thick. The osculum is naked and circular 

 in outline with a diameter of l|-2^ mm. Both dermal and gastral 



* Jenkins, The Calcarea of the National Antarctic Expedition. Natural History Re- 

 ports, vol. 4, 1908, pp. 31, 32, pi. 34, figs. 98-102. 



2 Idem, pp. 33-35, pi. 27, figs. 7, 8 ; pis. 35, 36, figs. 105-112. 

 8 Idem, pp. 32, 33, pi. 27, fig. 4 ; pis. 34, 35, figs. 103, 104. 



* Orantia ttuncatu Topsent, fiponges calcaires recueillis par le Frangais dans I'Antarc- 

 tique. Bull. Mus. ms. Nat., Paris, 1907, pp. 540, 541. 



8 Ebnerella schulzel Breitfuss, Kalkschwamme der Bremer Expedition nach Ost-Spitz- 

 bergen im Jahre 18S9, Zool. Anzeiger, 1896, vol. 19, pp. 492, 430 ; Zool. Jahrb. Syst. 

 Abt., 1898, vol. 11, pp. 113-115, pi. 13, figs. 39-52. 



