4 J Canadian Arctic Expedition, 1913-18 



deep into the substance of the wall. The canal system is "sylleibid;" the flagel- 

 late chambers, which are ovoid, measure about 0-13 mm. in longer iameter 

 and open into wide exhalant canals which in their turn open into the central 

 gastral cavity. 



There is a dermal skeleton of tangential triradiates and a gastral skeleton 

 of quadriradiates. The skeleton of the chamber layer consists of sagittal tri- 

 radiates, rather irregularly arranged, but usually with the basal ray centri- 

 fugally directed, with a few sagittal quadriradiates and radial oxea, which are 

 deeply imbedded in the wall and project beyond the surface. 



Spicules. — (1) Gastral quadriradiates. The oral rays, which measure up 

 to 0-2 by 0-013 mm. are slightly curved and gradually sharp-pointed; the 

 straight, sharp-pointed, basal ray is slightly longer than the orals, measuring 

 up to 0-22 by 0-013 mm.; the apical ray, wnich projects into the gastral cavity, 

 is short, straight, sharp-pointed, measuring about 0- 1 by 0- 01 mm. 



(2) Sagittal triradiates. Varying somewhat in size and form, but all with 

 a very wide oral angle. In some the basal ray is very long, straight and sharp- 

 pointed, measuring up to 0-5 by 0-013 mm.; while the orals, which measure 

 about 0-26 by 0-013 mm., curve forward at their point of origin and then turn 

 sharply outward. In others the rays are more or less the same length, measuring 

 on an average 0-4 by 0-014 mm., the basal ray being straight while the orals 

 are slightly curved. 



(3) Sagittal quadriradiates. These are like the sagittal triradiates, with 

 the addtion of a small apical ray. 



(4) Dermal triradiates. Slightly sagittal, with straight, gradually sharp- 

 pointed rays; the orals measuring about 0-26 mm. in length and the basal 

 slightly more. 



(5) Oxea. Slightly curved, gradually sharp-pointed, measuring up to 1-2 

 by 0-02 mm. 



(6) Small oxea. Found only in boiled out preparations; slightly curved or 

 crooked, gradually sharp-pointed, the ends usually differing slightly; measuring 

 up to 0-16 by 0-006 mm. 



Because of the unsatisfactory state of the material we do not think it possible 

 to identify the specimen specifically; it probably comes near to Leucandra 

 valida Lambe (1900) or Leucandra cylindrica Fristedt (1887). 



Register Number and Locality. — XIII; Richmond gulf (about 4 miles from 

 the entrance), east coast of Hudson bay, 10-20 fathoms, August 24, 1920, F. 

 Johansen coll. 



Reniera gracilis (Miklucho-Maclay) Dybowski 



Veluspa polym irpha, var. gracilis Mikltjcho-Maclay (1870). 



Reniera gracili; Dybowski (1880). 



There are twenty or more spirit specimens in the collection; some more or 

 less whole, others in an extremely fragmentary condition; there is also one dry 

 specimen (R.N. XXIII, 1). 



The colour in life (R.N.V) was light rose grey; in spirit it varies from light 

 yellowish brown to mud-grey; texture very soft and friable. 



The skeleton arrangement and spiculation agree closely with those of speci- 

 mens described and figured by Dybowski (1880). The short, sharp-pointed, 

 stumpy oxea measure on an average 0-14 by 0-012 mm. 



Register Numbers, Localities, etc. — -V: Station 41/, Bernard harbour (outer 

 harbour). Dolphin and Union strait. Northwest Territories, August 1, 1915, 

 2-3 fathoms.— XV, 1, 4 and XVIII, 1, 3: Station 20d, Beach at Teller, Alaska 

 (Port Clarence), July, 1913.— XVII, 2, 3: Station 206-c, Grantley harbour, 

 Alaska, about 3 fathoms, sandy mud, July 30, 1913. — XXIII, 1: Station 20m, 

 beach at Teller (Port Clarence), Alaska, August, 1913. (All Canadian Arctic 

 Expe dition, F. Johansen coW.y 



'For detail map ot Port Clarence see Vol. VII, Part N, p. 25 of these reports. 



