704 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



Distribution. — Station 4420, E. point San Nicholas Island S. 77 ° W. 

 5.7 miles, 33-32 fathoms (type-locality); Station 4421, E. point San 

 Nicholas Island N. 26° W. 3.8 miles, 291-229 fathoms; Station 

 4422, E. point San Nicholas Island S. 6° W. 2.5 miles, 31-32 fathoms. 



Family VIRGULARID^. 



Colony long and slender; leaves short, sometimes reduced to a 

 mere band of polyps, and without a plate of modified or aggregated 

 spicules supporting their bases. 



Genus BALTICINA. 



Stem short and thick, rachis proportionately very long, pinnae 

 reduced to band-like rows of calyces. There are spicules in the ten- 

 tacles of the polyps. 



BALTICINA PACIFICA, new species, 



Plate LXXXVII, figs. 1 and 2. 



A typical specimen measures 97.5 cm. in total length; the stem to 

 the first rudimentary polyps 93 mm.; bulb 25 mm. long; swelling 

 above bulb 75 mm. long. 



The axis cylinder is very strong and hard, reaching to the end 

 bulb. There are 114 rows of polyps, with 2 to 5 in each row, the 

 polyps being closely appressed to each other. The rows are 5 to 8 

 mm. apart, measured on the dorso-lateral side. 



The calyces decrease in size regularly from the first (ventral) to 

 the last in each row. Each calyx has two broad conspicuous thorny 

 spines on its lower margin, the outer spine being the larger. The 

 first and largest calyx is 4 mm. high to tip of spine, and 2.5 mm. wide 

 near the base. 



The polyps appear to be nonretractile, and are of the usual alcyo- 

 narian type. The tentacles are long, and their outer surface is cov- 

 ered with spicules. There are also a few spicules on the body walls. 



The zooids are in groups of 15 to 20 between the rows of polyps. 

 These groups show a tendency in places to an arrangement in two or 

 three rows. The zooids are unprotected by spicules, and appear as 

 simple rounded granules. There are a few scattered zooids on the 

 dorsal surface, usually continuous with the rows spoken of above. 



The spicules are bar-shaped, and apparently confined to the calyces 

 and polyps. They are most conspicuous in the calyces, where they 

 converge to form the marginal spines. There are a few transverse 

 rows on the polyp walls. They are diagonally arranged on tentacu- 

 lar bases and longitudinally disposed on the rest of the outer surfaces 

 of the tentacles. The spicules are much more abundant on the sides 

 of the polyps that are nearest the calycular spines. 



