358 



THE AMERICAN NATURALIST 



[Vol. LV 



fragments of disintegrated FoUiculhia arising from divi- 

 sion and dying. 



Comparing these measurements with those given by 

 Dons for SemifoUiculina hopcki, we see that they are 

 somewhat smaller except for the length of tube; but in 

 the present state of ignorance of limits of species it would 

 ])e folly to separate this from the SemifoUiculina hoecM, 

 which includes the so similar Larjotia viridis of Wright, 

 which Dons has separated from the simpler Folliculina 

 awpHlla of IVrueller. 



Xol innkiim' ;i new species of the Woods Hole form, we 

 may tfiitat refer it to SemifoUiculina hoecki as ex- 

 liil)ite(l ill tlic evidence; moreover, the form from 



the adjacent region of Newport described by Leidy, 

 though much like some of Dons's smaller S. gigantea, may- 

 he the same as S. hoecki, and we thus have probably this 

 one species along the New F^ngland coast, together with 

 the narrow-necked form Folliculina spirorhis as quoted 

 by Dons. 



Yet along with the above six specimens is one that is 

 al.ernnit. Its ^ac and tul)(- in one line stand out freelv 

 fron, til.' h><lroi<l, ;,11neli.'a n„ly Ml the h.-ne. The lube 

 eiilnr.uvs where Joliiliiu' the sac and eiiveh.])es it as a 

 .swelling within which the edgev of tile sac end as free lip 

 or intnrned shelf, i)roducing the appearance of a circular 

 valve standing inward from the wall. This empty case 

 is thus much like the Folliculina telcsfo of Laachmann 

 liu-nred by Don. from Dnihak, page 88, Fig. 2, and 

 !;iter (•;.l!e,l I'nrnfoJrnHlnin riohiceahy Dons. 



The (iiiiieiisioiis of tliis siiii^-U' empty case are: length, 

 -o'l: uiv.-.t.'^l uidlh, 'i.-^: leii-lh of tube, S2 ; width of tube 

 l.eii.nlh rnllar, ;;(>: width of eoMar. or lips, 4-J ; width of 

 ^v.-Ueii t'lhe ^^\u re eiiil.rnciii- luouih of ^.-ic, ol : width of 

 ^.•le juM lieiuu thi^ ^uellinu- of tube, 40; dinu'oii;)! uidth 

 ..r ii.ie r proj.etini;- flai.-e that nii-ht be enUed a ^al^e, 

 7'. ( Mirpai-.d uiih Laachiiiaiin\ ^peeiiiiei,. l'im) iMio hv 



tlie former in size and the latter in aitpearaiice and pro- 



