702 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



margin that is not usually well denned. The distal calyx on each leaf 

 is produced into a point extending beyond the expanded polyp. 



Zooids apparently wanting on both dorsal and ventral surfaces of 

 the rachis, and reduced to short rows of three each between adjacent 

 pinnae. They are quite inconspicuous, and might readily be over- 

 looked, being indicated in superficial view by nothing save the small 

 groups of colorless spicules by which they are surrounded. 



The spicules are colorless, of the ordinary pennatulid type, very 

 sparsely distributed in calycular walls. There is a group of larger, 

 spindle-shaped spicules beneath the origin of each pinna. Smaller, 

 rod-like forms are distributed over the surface of the rachis and stem. 



Color. — White, in preserved specimens, with the exception of a 

 purple spot about 10 mm. long on the swelling above the terminal 

 bulb. 



Type-specimen. — Cat. No. 25424, U.S.N.M., Albatross Station 4473 

 (See below). 



Distribution.— Station 4439, Point Pinos light-house S. 38° E. 6 

 miles, 42-40 fathoms; Station 4445, Point Pinos light-house S. 13' 

 E. 6 miles, 66-60 fathoms; Station 4446, Point Pinos light-house S. 

 2° W. 5 miles, 59-52 fathoms; Station 4453, Point Pinos light-house 

 S. 17° W. 2.3 miles, 49-51 fathoms; Station 4454, Point Pinos light- 

 house S. 13° E. 8.3 miles, 71-65 fathoms; Station'4457, Point Pinos 

 light-house S. 21° W. 6.1 miles, 46-40 fathoms; Station 4460, Point 

 Pinos light-house S. 12° E. 10.8 miles, 55-67 fathoms; Station 4473, 

 Point Pinos light-house S. 15° E. 2.8 miles, 59-65 fathoms; Station 

 4482, Santa Cruz light-house N. 39° W. 8.7 miles, 43-44 fathoms. 



ACANTHOPTILUM SCALPELLIFORME Moroff. 



Plate LXXXVI, figs. 9 and 10. 



Acanthoptilum scalpelliformis Moroff, Zool. Jahrb., Abth. Syst. Geog. und Biol. 

 Thiere, XVII, 1902, p. 394. 



An exceedingly attenuate form with true pinnae. Length 97.5 cm., 

 length of stem to first rudimentary pinnae 262 mm. Pinnae very 

 numerous, short, well separated, 3.5 mm. long by 1.5 mm. broad at 

 the base. 



Polyps 7 or 8 to each fully developed pinna, uniserial, the last orj 

 distal one on each pinna being widely separated from the next. 



In the stem the bulb passes insensibly into the swelling, the two 

 together being 135 mm. long. 



The zooids are in lateral rows joining the bases of the pinnae, about 

 s in a tow. Sometimes the rows are partially double. The zooids 

 are indicated by round white dots more or less completely surrounded 

 by spicules, 



