6q PENNATULIDA. 



as a new species. The specimen is quite complete, but it is a young stage and even very little 

 developed, so that it is impossible to give a complete diagnosis. The information given above 

 as to the arrangement of polyps and zooids is such as is known to change with the growth, and it 

 is therefore given in parentheses. The feature by which we are especially justified in supposing 

 this specimen to represent a separate species is the form of the polyp-calyx. This indeed, is 

 formed like a horn, as in the preceding Protoptilu w-species, but its upper end projects to a far higher 

 degree from the cceneuchyma of the rhachis, the axial edge being also distinctly marked and freely 

 projecting; this edge however has no teeth — at all events in most of the polyps — whereas the other 

 part of the edge runs out in six long, pointed and strongly spiculed teeth, of which the four middle ones 

 are as well-developed as the calyx-teeth for instance in Pennatula phosphorca. The terminal polyp 

 (and, I think, also the two upper lateral polyps nearest to it) is provided with a complete circle of 

 eight developed, long calyx-teeth. The calyx is abundantly furnished with long, strong spicules; some 

 of these form six slightly elevated lines continuing into the long calyx-teeth. The polyps are naked 

 with the exception of the tentacle-stem, the aboral side of which shows a very strong formation 

 of spicules. All the polyps, also the terminal one, contain large, developed sexual organs; even the 

 lowest, still cpiite undeveloped polyps contain large sexual organs, so that the whole rhachis (by 

 clearing in oil of cloves) conveys the impression of being quite filled with these products. The 

 polyps decrease in size gradually from above downwards; the lowermost ones are still quite undevel- 

 oped, and form a rather short row of 4 — 5 individuals on either side. 



In the zooids, the abaxial side is richly provided with spicules which form a calyx, generally 

 with two lateral points; the terminal zooid referred to later has a more strongly marked calyx, 

 provided with three calyx teeth. 



The arrangement of the polyps and zooids shows quite distinctly that the colony is in 

 an undeveloped state. At the top, the rhachis ends in a terminal polyp whose calyx, as mentioned 

 above, is complete all round and provided with a circle of eight teeth. The other polyps generally 

 form a single row on either side of the rhachis; in this row each polyp more or less distinctly forms 

 a pair with that of the opposite side, but in reality the rows are a little alternating. On each side 

 larger polyps (a) alternate with others a little smaller (b); further, the latter are placed a little more 

 ventrally than the former. Each pair of opposite polyps consists of a larger, placed more dorsally (a), 

 and a smaller, more ventral, e. g. of an <?-polyp to the right and a £-polyp to the left; then the pairs* 

 above and below have a £-polyp belonging to the right side, and an (/-polyp belonging to the left 

 side and so on. At the upper end of the rhachis an arrangement in oblique rows of two polyps is 

 indicated, the two uppermost ^-polyps being placed much nearer to the ventral median line than the 

 others of the same pairs farther down the rhachis. Otherwise, the polyps of the same side join each 

 other at their calyxes. The dorsal zooids are arranged in a row on either side of a slight 

 dorsal median streak; at the top the double row terminates in a somewhat larger, unpaired terminal 

 zooid placed at the base of the calyx of the terminal polyp; as stated above, this zooid is provided 

 with a more marked and three-pointed calyx. The ventral zooids are in a similar way arranged in two 

 rows, but a ventral median streak is not distinctly seen, excepting at the lower end of the rhachis. 



The spieulation is highly developed; spicules are only wanting on the terminal bulb of the 



