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. Surface of column smooth, height 5-8 mm., ine ix mm. ; 
THE AMERICAN NATURALIST. [Vor. XXXIV. 
Height of column 75-100 mm., diameter of oral disk about 125 mm. ; 
tentacles very numerous (about 384) 
Paractis perdix Ver., M., 62-192 fathoms (Fig. 14) 
SUBFAMILIES OF SAGARTIDZ. 
. Column divided into two segments, an oral capitulum and an aboral 
scapus ; cinclides usually absent . : . Phelline 53 
. Column undivided ; cinclides usually create ; . Sagartine 39 
GENERA AND SPECIES OF SAGARTINAE. 
. Column wall smooth or with d very Mec evidence of tubercles, no 
cinclidial tubercles : à i : : 40 
. Cinclidial tubercles present i i : à i K 48 
. Oral disk lobed, tentacles very numerous ; . Metridium 41 
. Oral disk not lobed, tentacles numerous . ‘ ; Sagartia 42 
SPECIES OF METRIDIUM. 
. Column roo mm. in height, diameter of oral disk 75 mm. ; tentacles 
very numerous, the central ones longest Metridium marginatum 
(Les.) M. Edw., N., M., low water to 9o fathoms (Fig. 15) 
. Polyp as in preceding species but with tentacles longer and more 
slender . ; : : M. fimbriatum Ver., P., low water ! 
SPECIES OF SAGARTIA. 
. Tentacles peripheral, so that more than half of the oral disk is 
expo 
. Tentacles chem m oral disk so that very little or none of it is 
expose 
. Height of column 15-25 mm., pe 10-20 mm.; tentacles about 
fifty, in two, three, or more rows, rather small 
uito S Ver., M., 72-1 Ro fathoms 
Height of column less than 10 m 45 
Height of column about 20 mm. 46 
Height of column 40 mm. or more 47 
; tenta- 
cles eighty-four, in four rows, central ones longest 
S. lucia Ver., M. N. tide pools 
. Surface of column broken by longitudinal and transverse furrows, 
height 6 mm., diameter of pedal disk 10-14 mm., of oral disk 6 mm., 
tentacles loug, sixty-four, in four rows 
S. pustulata McMur., M., shallow water 
1 Probably synonymous with M. marginatum. 
