127 



one of several ways according to the criteria of classification, which 

 may be the character of the setje, the presence or absence of intestinal 

 diverticula, the presence or absence of peptonephridia, the i)lace of 

 origin of the dorsal vessel, or the presence or absence of ampull?e on 

 the sperniathecie. 



Of the assemblage of species included in 1 1 culca, four species and 

 two varieties have been described from Xortli America. They are as 

 follows, the type locality for each jjeing given: H. calif oniica Eisen 

 (Santa Rosa, Sonoma Co., California), H. calif ornica, var. monticola 

 Eisen (West Fork, Feather River, California), H. calif oniica, var. 

 hclcncc Eisen (St. Helena, Napa Co., California), H. chrlionii Eisen 

 (Mountain View, San Mateo Co., California), H. guateuialcc Eisen 

 (Guatemala City, Central America), and H. scharffi Southern (White 

 Mountains, New Hampshire). Two new species, H. moderata and 

 H. urhancusis, are described in the following pages. 



Leidy ( Journ. Acad. Nat. Sci. Phil., ser. 2, Vol. 2, 1850, p. 48) de- 

 scribed a species under the name of Bnchytrceus socialis from eastern 

 Pennsylvania. The description is so inadequate that it is very un- 

 certain what the species is. Michaelsen ('00, p. 69) regards it as a 

 synonym of Hcnlea vcntriculosa Udek., and there appears to be evi- 

 dence in favor of this view. It thus appears that H. ventriculosa may 

 be added tentatively to the list of North American species of this 

 genus. 



Michaelsen ('00, p. 67) defines the genus as follows: "Borsten 

 gerade oder schwach S-formig gebogen. Kopfporus klein, zwischen 

 Kopflappen und i. Segm. ; Rlickenporen fehlen. Lymphkorper von 

 einerlei Gestalt, gross, meist discusformig, selten elliptisch, dunkel 

 granuliert. Der Oesophagus geht im 7., 8. oder 9. Segm. plotzlich 

 in den weiten Mitteldarm iiber. Ursprung des Riickengefjisses ante- 

 clitellial, im 8. oder 9. Segm. ; Blut farblos ; Herzkorper fehlt. 

 Nephridien mit kleinem, einfachem Anteseptale. Hoden massig. 

 Samcntaschen einfach, ohne Divertikel, mit dem Oesophagus kom- 

 munizierend." 



Key to the: Species oe Henlea known to occur in 

 North America 



1 (2) SpermatliecK with diverticula ehrhorni 



2 (i) Spermathccse without diverticula. 



3 (4) No intestinal diverticula present scharffi 



4 (3) Intestinal diverticula present. 



5 (14) Two intestinal diverticula present. 



