No. 405.] MORTH-AMERICAN INVERTEBRATES. 753 
GENERA AND SPECIES OF PARACTID&. 
31. Inner tentacles many times longer than outer 
31. All tentacles of about the same length 
. 3 
32. Polyp massive, height 150-180 mm., diameter of ital disk 200-250 mm.; 
tentacles numerous 
Actinostola 32 
Actinostola callosa Ver., N., M., 45-300 fathoms (Fig. 11) 
33. Diameter of pedal disk much less than that of column Ammophilactis 34 
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Fic. 11. Fic. 12% 
Fic. 11. — Actinostola callosa Ver. After Verrill. 
Fic. 12. — A mmophilactis rapiformis (Les.) Ver. After Verrill. 
33. Diameter of pedal disk as great as that of column or greater . 35 
34. Height of column 80 mm., diameter of oral disk 25 mm., of column 12- 
25 mm., of pedal disk 10-12 mm. ; tentacles numerous (144 or more) 
Ammophilactis rapiformis (Les .) Ver., M., tide pools e ig. 12) 
35. Sphincter well developed, collar pronounced, especially in contracted 
specimens Siiri 36 
35. Sphincter poorly developed, collar scarcely noticeable even in con- 
tracted specimens : x , : . Paractis 57 
Fic. 13. FiG. 14. 
Fic. 13. — Stomphia carneola (Stimp.) " P usu Verrill. 
Fic. 14. — Paractis perdix Ver. After V 
36. Height of column 50 mm., diameter of oral disk about 37 mm. ; tenta- 
cles ninety-six or more, in two or three crowded marginal rows 
Stomphia carneola eras Ver., N., 8-35 fathoms (Fig. 13) 
