277 
water. — Accordingly the species has a world-wide distribution 
in the Oceanic depths. — Recently it has been recorded from Bering 
Sea and Japan (Bi g elo w 1913). 
Stations: 322 (r) — 333 (rr) — 336 (rr) — *338. 
Lucernaria quadricornis O. F. Muller. 
One speciraen from station 422, depth 83 m. 
Periphylla hyacinthina Steenstrup. 
Steenstrup 1837. 
Haeckel 1879 p. 419. taf. 24, ligs. 11—16. 
Vanhoffen 1902 a p. 23. 
Maas 1904 p. 47, pi. 5, lig. 35, pi. 6, figs. 45-46. 
— 1906 pp. 502, 511. 
Bigelow 1909 p. 26, pi. 1 & 9. 
This magnificent species occurs commonly in the deep water 
(sparingly in the upper strata) in the Irminger Sea and the Davis 
Stiait, northwards as far as the submarine ridge from the west 
coast of Greenland to Baffins Land. It was caught by the “Tjalfe” 
Expedition at 25 stations. Only fiye specimens were taken in the 
upper layers of the water (0—200 m. Wire, Stat. 1 a, 6, 35 a, 
272 and 314); with these exceptions the species has only been 
taken with more than 500 m. Wire, and it was found in all the 
hauls with 1000—2000 m. Wire. — Specimens of all sizes were 
found; two specimens (stat. 1 a and 9) are said to have been about 
50 cm. in diametei; unfortunately they could not be preserved; 
several large and medium-sized specimens are to hånd, and a great 
many small ones. Small individuals are found at every season, 
at every place in the area, and in every depth, though they occur 
most numerously in the great depths, as will be seen from the table. 
Periphylla hyacinthina is an inhabitant of the great oceanic 
depths, but some authors have noted, that the species may be 
found now and then nearer the surface in the colder areas of the 
ocean. It has a wide distribution, being found at Spitzbergen, 
commonly occurring in the Irminger Sea and the Davis Strait, 
