m. G30] 



A ME RICA X FOLLIC VLIKA S 



portions, as seen in tlie above Fig. 2. This single speci- 

 men agrees very well in size with the six others on same 

 material, but differs in the narrow lips and the swollen 

 base of tiil)e ciiibi-ncin.ii- tlic sae, as well as in the attach- 

 ment of a sac l)y end only. 



Knowing the normal mode of seei't'tion of sac and of 

 tube, one is tempted to suppose that a single exceptional 

 specimen like this may have arisen by some fault in at- 

 tachment of a swimmer followed by lack of proper 

 rhythm of secretion, so that sac was attached by end and 

 not along whole side, and that later the animal abnor- 

 mally started to secrete a second collar within the old 

 junction of sac and tube, bulging out the tube while still 

 soft by pressure of its persisting mushroom and making 

 an inner rim or shelf to represent an imperfect collar 

 after it had already made an insufficient one at the mouth 

 of the abnormally narrow tube. The whole structure 

 W(nild tlins lie an abnormal i)rodnet i-o-nltlng from slight 



nnn>ual attitude in nttnchnu'iit. Sncli an livjiothesis for 

 ( xplnining the tclcsto sha]..' might be ext. n. led to all the 

 t.'li-to f.>rnis srrn liitluTto by Lancliniann and bv Don^. 

 and Ihrse aiv significantly f.^w; tlins I.aarliinann foinid 

 but one specimen on material from Sumatra and l)on< 

 found 20 after much search on Eudi'iidi-inm from the 

 Adriatic and but about a dozen amidst \ery many /•'. 

 ampulla {i.e., 8. hoec¥i) from Driibak. and nom at all 

 from North Norway. A form occurring but I'ar. ly and 

 found in Sumatra, Vest Australia, X..rway and Woods 

 Hole, Mass., may well !)i-ove to l)e but an abnonnality 

 rather than a real species. 



The same sus].icion of abnormality attaches to tour 



tlu' above hvdroid material from Woods Hole. Appar- 

 (utly r.nlinlsh.Ml they are charaeteri'/ed by on-at breadth 

 and shortness and i)v narrow openings wher(> the tube 

 had not yet b..en a. hied. With l.Migth of lH' 11:1 these 

 sacs were !H) wide. They thus recall j)roi)ort ions of 



