518 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



speciiueus of the species, all from St. Piiul. 

 small. 



Of these all but three or four are very 



Boltenia elegans Heriluian. 



The three specimeus la the collection, all from St. Paul Islaud, which I identify 



as this sjjecies, differ so trivially (our 

 individuals are slightly darker in color 

 and a little rougher on the surface) from 

 specimeus of the species taken by the 

 Albatross (latitude 57° north, longitude 

 151P west, in 33 fathoms), that the cor- 

 rectness of the identiticatioii can not be 

 doubted. 





Polyclinum globosum, new spooios. 



General characler of the colony. — 

 Massive, inclined toward the spherical 

 form, attached by a sinall area OTdy; 

 api)arently easily detached, since all the 

 specimens at liand are freed from their 

 original substrata. (Fig. 1^.) 



Dimejisions of largest colony: 

 least transverse diameter, 35 mm. The other colonies considerably 



/«- 



Length, 45 mm 

 smaller. 



Color, greenish brown. 



Zooids. — Large and numerous, though scarcely visible on 

 the surface of the jireserved colonies. The irregular systems 

 contain luimerous zooids, many of which are quite distant 

 from tlie broad but inconspicuous atrial orifice common to 

 the system. Positions api)roximately perpendicular to tlie 

 surface of the colony, (l^^ig. 11 5^.) 



Body distinctly separated into tliree regions, viz, thorax, 

 abdomen, and postab(lon)en. (Fig. 15.) 



Measurementsof the zooids: Totallength, 10 mm.; length 

 of thorax, 4 mm. ; length of postabdomen and abdomen, (i mm. 



I'cst. — Small in quantity among the zooids, so close are 

 these to one another; but a considerable mass in the middle 

 of the colony in wliich no zooids occur. (Fig. 14.) Surface 

 layer considerably denser and darker in color than the deeper 

 portions, a few scattered sand grains embedded on the sur- 

 face. The inner mass containing no zooids, rather firm in 

 character; ()i)a(iuc white, contains many small cells, but 

 no bladder cells; penetrated by the stolonic vessels of the 

 zooids, though these are not numerous. A few scattered stellate crystals present. 



Mantle, — Very thin, containing a few muscle fibers, mostly running lengthwise 

 of the body; some circular fibers at the anterior end of the thorax encircling the 

 siphons. 



Branchial apparatus. — Branchial orifices indistinctly seen on the surface of the 



