PENNATTJLIDA. 77 



The other specimen, from the Denmark Straits, was unfortunately not preserved until it was 

 quite shrunk; it had long escaped attention, because it was jammed in at the iron frame of the trawl, 

 and was quite wrapped up in threads of swabs; the specimen was otherwise quite complete, the 

 slender calcareous axis not even broken. The total length, the stretched polyps with their tentacles 

 included, is (fully) 53O mm ; ca. 500 mm from the lower end of the peduncle to the base of the polyp- 

 bodies. The length of the peduncle is only 4O mm , its largest diameter somewhat more than 3"; from 

 the peduncle the stalk decreases in thickness upward from ca. 2 mm to o.5 mm , and then it again in- 

 creases evenly in thickness towards the cluster of the polyps; it is somewhat spiral-shaped longitudi- 

 nally, and bent in a large flat curve ca. 2o mm below the polyp-cluster whose longitudinal axis is a 

 direct prolongation of the upper part of the stalk. Even if respect is paid to the completely shrunk 

 condition of the specimen, which disparages, of course, the value of all the measurements to some 

 degree, it will be seen that the form is remarkably long and thin. The polyp-cluster is relatively 

 small and slender, ca. 37 mm long, measured from the point where the stalk begins to spread into the 

 polyp-bearing part, to the point of the stretched tentacles; it consists of six developed polyps, and no 

 rudiments are found; the polyps are of somewhat different sizes, 6 n mn > long, with tentacles longer 

 than the polyp-body, the longest ones up to ca. 2o mm , with irregularly alternating larger and smaller 

 pinnulae. The primary polyp is easily recognisable from the fact that the calcareous axis may be traced 

 distinctly into the dorsal side of its base: it is smaller than the polyps placed nearest to it laterally. 

 The latter are arranged in such a way, that two are placed to the right of the primary polyp and 

 three to the left; of the latter, the one placed nearest to the ventral median line is the smallest, it 

 is even considerably smaller than the primary polyp; the others are of about equal size. The polyp- 

 bearing part of the stalk (the rhachis s > of the authors) is about iy m long, 5 mm from side to side, 

 and 3' mn from the dorsal to the ventral side in the broadest place. 



The zooids form tongue-shaped areas between the polyps, two on the left side, one on the 

 right; between the polyps of the two sides on the ventral aspect there is a narrow naked streak, 

 whilst the zooids of the dorsal aspect continue up on the base of the primary polyp. On the upper 

 part of the stalk, below the cluster, the zooids are placed all round, but they soon pass into a single 

 row on either side, and they continue to be arranged chiefly on the two lateral surfaces quite down 

 to the peduncle; a few may, however, be found here and there on the other surfaces. In spite of the 

 shrunk condition the two dorsal mesenteric filaments (the only ones) of these zooids are seen very distinctly; 

 on the other hand, no tentacle is seen on the zooids of the stalk. The calcareous axis throughout 

 its whole extent is quadrangular with deeply concave surfaces. Spicules are wanting, except in the 

 lower end of the peduncle, where there are numerous, very small -- o.oi6 mm long, o.oo64 ram broad - 

 oval calcareous bodies, often slightly constricted in the middle, so as to get somewhat the shape of an 

 8; still smaller, quadruple calcareous bodies are rather numerous. The colour of the polyps was a 

 dark chocolate-colour; in water a red-brown dye may be pressed out of crevices in the polyps. 



This specimen agrees very well in appearance with Lindahl's two specimens from Baffin's 



Bay and the Umanak Fjord, and especially with the one he has called U. pallida; the whole slender 



form of the polyp-cluster the fact that the tentacles of the polyps are much longer than their body 



- aboxi t twice as long and the exceedingly long, slender, and graceful stalk, render it certain that 



