No. 639] .lJ/A7.'/r.l.V t OLLWULlNAS 355 



The genus Semifolliculina he has invented for bottles 

 of narrower form with longer necks, often spirally orna- 

 mented and provided with a collar or lip. He says that 

 one of the most widely distributed, Semifolliculina hoccJxi, 

 occurs in North America, and probably he had in mind 

 the specimens described by Leidy as Freia americaua as 

 above related. However, the description given l)y Leidy 

 speaks of the "convolvulus-like mouth" of llic tube 

 which is plainly shown in an unpublished skt'tcli ( l-'i^-. 

 414, Vol. V, of Leidy's MS. drawings) made by Leidy, 

 which, with his notes, were kindly copied for mo by Pro- 

 fessor J. Percy Moore, who succeeded in finding it among 

 unpublished material left by Leidy. This sketch also 

 shows not only transverse lines on the tube, but longitudi- 

 nal lines that may be compared to those of Dons's Semi- 

 folliculina gigantea (though Leidy may have dra\\Ti some 

 of the lines to bring out curvature). At all events the 

 very wide lip of the tube recalls the lip of S. gigantea. 

 The size of the animal stated in Leidy's published notice 

 is almost a fifth of a line. In his manuscript certain 

 measurements would on this basis mean that: length of 

 animal is 41b /' ex])aii(le(l Init L'!)S contracted; length of 

 entire bottle 41 (1 /- : width (if animal Ibb but at narrow 

 neck below terminal funnel S,",; width of expanded funnel 

 and lobes, that separate " like a labiate flower," is 139 

 From the sketch the evident nucleus is a rounded mass 

 that might be 40 in diameter. 



Dons has given measurements of various parts of bot- 

 tles of Semifolliculina boecJci in contrast with those of 

 S. gigantea from which it appears that the animal seen 

 by Leidy was ratlier larger than the tubes of S. hncchi; 

 thus tlie eoni1)iiHMl lenuHis of sac and tubt^ in S. bopcki 

 are L'Co 410 nnd foi' N. a'>aa,<fra aiv lT)!) inoi); the width 

 of sae. KC) b'!.") in the former ami ^'M) :W i„ latter. 

 Leidy's animal was apparently Kifi wide and it> bottle 

 416 iong. Thus both width of li])s of tube ami dinn'n- 

 sions as far as knowTi tend to place Leidy's animal in 

 S. gigantea rather than in S. hoecVi. However, the tig- 



