No. 405.] MORTH-AMERICAN INVERTEBRATES. 755 
46. Height of column 20 mm., diameter 3-4 mm. ; tentacles forty-eight, in 
four rows . . S. gracillima MeMiüm M., shallow water 
47. Height of column és mm., diameter 15 mm.; bie about sixty, 
rather short, length less hai the diameter of the oral 
S. modesta Ver., M., low water aa ig. 16) 
47. Height of column 40 mm., diameter 25-35 mm. ; tentacles numerous, 
in three to five rows, longer than the diameter of the oral disk 
S. abyssicola (Kor. and Dan.) Ver., N., M., 75-640 fathoms 
i 
Fic. 15. Fic. 17. 
Fic. 1 Hoc on marginatum (Les.) M. Edw 
Fic — Sagartia modesta Ver. After Verrill. On the sides of the column several twisted 
acontia are seen, their points of exit rad the positions of cinclides 
Fic. 17. — Cylista leucolena (Ver. Andres. After Verrill, 
OTHER SPECIES OF SAGARTINA. 
48. Cinclidial tubercles small, in irregular vertical lines . . Cylista 50 
48. Cinclidial tubercles large : 49 
49. Cinclidial tubercles forming a tud NERA middle of colia 
Aiptasia 5I 
49. Cinclidial tubercles forming a band around pedal end of column 
damsia 52 
50. Height of column 63 mm., diameter 10 mm. ; tentacles ninety-six, in 
five rows, slender, and longer than twice the diameter of the column 
Cylista leucolena (Ver.) Andres, M., shallow water (Fig. 17) 
51. Height of column 38 mm., diameter of oral disk 18 mm. ; tentacles 
ninety-six, in four rows, length of inner tentacles 20 mm., of outer 
ones 6 mm. Aiptasia pallida (Ver.) Andres, S., shallow water 
52. Height of column 75 mm., diameter 43 mm.; tentacles very numerous 
(500 or more in large bpecimida d ; on dead shells inhabited by her- 
mit crabs 
Adamsia tricolor (ben) Duch. and Mich., S., shallow water 
32. Height of column 10-14 mm.; tentacles numerous, in two circles ; 
young on dead shells inhabited by hermit crabs (Catapagurus soci- 
alis Smith), later the shell may be dissolved, the polyp having 
formed a horny hood in which the crab protects its abdomen 
A. sociabilis Ver., M., 76-410 fathoms (Fig. 18) 
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