REPORT ON THE PENNATULIDA. 11 



If this form did not present the very remarkable feature of the tentaculated polyp- 

 cells, of which fig. 13 representing a young leaf gives a very good idea, nobody would 

 entertain a doubt of its being only a stout form of the long-known ScytaUum 

 sarsi. But the tentacles, which are found on every polyp-cell, and, as the younger 

 leaves show, are developed before the polyps, make it necessary to describe it under 

 a new name, so long as no intermediate forms between it and ScytaUum sarsi 

 are found. Besides this, the size of the most developed polypidom and the colour 

 deserve attention. The largest specimen was only coloured (1) in the region of the 

 polyp-cells, but not everywhere on all leaves, and not on all cells of the coloured leaves, 

 and (2) on the upper part of the stalk. A second specimen was nearly colourless, with the 

 exception of the upper end of the stalk. Two others, on the contrary, were pretty strongly 

 coloured on the stalk, the rachis, and the base of the leaves. As a difference between the 

 two forms I may also mention the form of the lowest undeveloped leaves. In ScytaUum 

 tentaculatum these form a short series, and the leaves assume very near the end the form 

 given in fig. 13, whilst in ScytaUum sarsi the row of these pinnules is longer, and 

 many of them are remarkable from the fact that the polyp-cell near to the ventral 

 surface is larger than the rest. The calcareous corpuscles are the same as those in 

 ScytaUum sarsi, only their maximum length is a little less on the stalk, in ScytaUumi 

 tentaculatum 38 ju,, in ScytaUum sarsi 53 /x,. 



Four well-preserved specimens were at my disposal, of which I here give the following- 

 measurements : — 



A. B. C. D. 



Length of the whole polypidom, 



Length of the whole stalk, 



Length of the base of the jjinnule^, 



Length of dorsal border, 



Breadth of the stalk, 



Breadth of the rachis, . 



Number of pinnules, 



Length of the tentacles at the polyp-cells in adult leaves 0'58 mm. 



Length of the tentacles at the polyp-cells in youug pinnules 0-80 to 1"0 mm. 



Habitat.— Station 203, Philippines, lat. 11° 7' N., long. 123° 7' E. Depth, 10 to 12 

 fathoms. Mud. October 31, 1874. 



Section II. SPICAT^. 



Sub-section I. FUNICULINEiE. 



Family 2. SxACHYPTlLlDyE. 



Stachyptilurii, n. gen. 



SmaU pens without leaves, polyps with cells in small rows of four on both sides, and 



on the dorsal aspect of the rachis. Cells without stronger spines at their openings. 



