PENNATULIDA. 6j 



peduncle and the retractile part of the body of the polyps, as well as on the pinnulse. The longest 

 and strongest are found on the abaxial side of the calyxes of the polyps, the shortest and 

 thickest (of almost oval contour) on the peduncle; on the lower part of this these spicules are 

 arranged, partly somewhat irregularly, partly \\ith the longer axis placed transversely: farther up 

 they form longitudinal layers with finer and longer forms interspersed ; still farther up elongated 

 spicules longitudinall}' arranged predominate. The long spicules are of the connuou triangular form, 

 sometimes the edges curve irregularly in and out. As I was not willing to sacrifice any part of this 

 one specimen for a more thorough examination of the spicules, only such have been measured as 

 could be seen distinctly in situ, or dropped off during the manipulation of the specimen. The longest 

 and biggest may be given as ca. 0.960'"™ long, and a greatest breadth of 0.064™'"; others (measured 

 when isolated) are 0.464 — 0.804""" lo"g ^"d 0.032'""' broad; the smallest tenta9le-spicules measured are 

 0.400'"'" long and 0.0240'"'" broad; the short and thick spicules of the peduncle are generally 0.096 

 —0.144'"'" long, o — 032'"'" broad. 



The calcareous axis is round, ending below in a bent hook far from the lower end of the 

 peduncle (at ''' in the figure); this feature, however, is due to the accidental, uuich stretched condition 

 of this part of the body of the colon\-, and so it cannot here, any more than elsewhere, be regarded 

 as being of any value as a specific character. I have not been able to find the upper end of the 

 calcareous axis, but I have followed it to about the height of the terminal zooid. 



The whole colon\- is white, all the spicules colourless. 



Occurrence. St. 20, sS"" 20' N. Lat, 40^ 48' W. Long., 1695 fathom.s. Bottom temp. i°.5 C, 

 the bottom light gray mud, i specimen. 



The specimen in hand shows the following measurements: 



Total length 75 mm. 



Length of peduncle 40 » 



Greatest thickness of peduncle (close below the rhachis) 1.8 » 



Length of terminal bulb 3 » 



Breadth > 1.5 » 



Breadth of rhachis measured across the mouths of two opposite polyp-calyxes. . . 3 * ' 



Length of a polyp calyx, from the base to the point of a tooth 4 — 4.5 » 



■■ » > :> :> » notch Ijetweeu two teeth 3 » 



The calyx-teeth i — 1.5 » 



Diameter of the mouth of the calyx 1.3 » 



Since, according to the description by Kolliker of Protoptilnin s)iiittii , there might be reason 

 to suppose that the specimen of the Ingolf was perhaps the same species, I have, by the kindness 

 of Professor The el, examined the t>-pe specimen of Pr. sinittii. This specimen is also at a little 

 developed stage, mainly with one row of polyps on either side; but the top is broken off (it is upon 

 the whole rather damaged); some agreement is present in the outer appearance, but the teeth of 

 the polyp-calyxes are broader and var}- nujre irregularly in size and number (3—5), the zooids are 



