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Show 512 DR. HUBRECHT ON A N E W PENNATULID. [May 19, 3. O n a new Pennatulid from the Japanese Sea. By Dr. A. A. W . H U B R E C H T , C.M.Z.S., Professor of Zoology at the University of Utrecht. [Received April 30, 1885.] (Plates XXX. & XXXI.) In the year 1 874, Captain St. John, then in the Japanese sea, at 34° 11' N., 136° 33' E., captured at a depth of 71 fathoms two specimens of Pennatulids (see Plate X X X . figs. 1-3). They passed into the possession of Professor W . C. Macintosh of St. Andrews, whose numerous duties and arduous researches in another field of Zoology (Report on the Annelids of the ' Challenger,' &c.) allowed him no leisure to make anything more than a superficial examination of the animals in question. When, in 1884, I had the pleasure of making a short stay at St. Andrews for the purpose of utilizing the numerous facilities offered by the Zoological Station which at the initiative of this distinguished biologist, has arisen at that interesting point of the Scottish coast he kindly showed me over his extremely rich collection of marine invertebrates, mostly iu spirit and in excellent state of preservation. W e came upon the bottle containing the Japanese specimens, and as I noticed certain distant points of resemblance with Solenogastres, in which I was at the moment particularly interested (presence of calcareous spicules in the integument, club-shaped form, faint longitudinal groove on the concave side, & c ) , Prof. Macintosh most courteously put both the specimens at m y disposal for a more detailed anatomical examination. I was very glad to accept the proposal. This paper contains the result of m y investigations, for which, as far as the internal structure is concerned, only one of the specimens (fig. 1) was sacrificed, the other one (figs. 2 & 3) having been returned to the owner intact. Moreover the series of sections which were made through the first specimen were all duly preserved, and are now at St. Andrews. An examination of the two specimens with low power very soon dispelled the possibility of any relationship to the Solenogastres, and showed the organism to be a colony, from which the shrivelled bodies of the polyps with their fringe of long tentacles might be seen to emerge. It was in the thickened portion, the rhachis (r), that this was noticed ; the stem (s) is devoid of polyps and terminates in a rounded knob, which shows a faint swelling just before the lower extremity. Subterminally there was on the concave side a very short oblong furrow, at the bottom of which no opening whatever could be detected. The colour of both specimens is of the light brownish-red which is reproduced in the figures ; and superficial examination revealed the existence not only in the stem, but along the whole rhachis, of delicate calcareous spicules, so densely accumulated as to make the |