618 



THE FUR SEALS OP THE PEIBILOF ISLANDS. 



specimens of the species, all from St. Paul. Of these all but three or four are very- 

 small. 

 Boltenia elegans Herdman. 



The three specimens in the collection, all from St. Paul Island, which I identify 



as this species, differ so trivially (our 

 individuals are slightly darker in color 

 and a little rougher on the surface) from 

 specimens of the species taken by the 

 Albatross (latitude 57° north, longitude 

 159° west, in 33 fathoms), that the cor- 

 rectness of the identification can not be 

 doubted. 



Polyclinum globosiim, new species. 



General character of the colony. — 

 Massive, inclined toward the spherical 

 form, attached by a small area only; 

 apparently easily detached, since all the 

 specimens at hand are freed from their 

 original substrata. (Fig. 14.) 



Dimensions of largest colony: 

 least transverse diameter, 35 mm. The other colonies considerably 



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Length, 45 mm. 

 smaller. 



Color, greenish brown. 



Zooids. — Large and numerous, though scarcely visible on 

 the surface of the preserved colonies. The irregular systems 

 contain numerous zooids, many of which are quite distant 

 from the broad but inconspicuous atrial orifice common to 

 the system. Positions approximately perpendicular to the 

 surface of the colony. (Pig. 14 Z.) 



Body distinctly separated into three regions, viz, thorax, 

 abdomen, and postabdomen. (Fig. 15.) 



Measurements of the zooids : Total length, 10 mm. ; length 

 of thorax, 4 mm. ; length of postabdomen and abdomen, 6 mm. 



Test. — Small in quantity among the zooids, so close are 

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

 of the colony in which 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; opaque 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. — Yery 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 



