4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 79 



Host. — Raim pretiosa. 

 Location. — Intestine. 



Zoc«7?7.y.— United States (Bothell, Wash.) 



Type Ipedmen.—V.S.^M. Helm. Coll. No. 29903; paratypes, 

 U.S'.N.M. Helm. Coll. No. 29904. 



SYSTEMATIC POSITION OF HAPLOMETKANA INTESTINALIS 



The family Plagiorchiidae Llihe, 1901, has been frequently sub- 

 divided and revised by various parasitologists. The most recent re- 

 vision, and one that is based upon extensive studies pertaining to 

 many of the genera concerned, is that of Travassos (1928). His 

 six subfamilies represent a conciliation of his own studies and views 

 with those of Baer (1924) and Poche (1926), and are as follows: 

 Plagiorchiinae Pratt, 1902; Brachycoeliinae Looss, 1900; Saphae- 

 drinae Baer, 1924; Reniferinae Pratt, 1902; Prosthogoniminae Llihe, 

 1909; and Opisthogoniminae Travassos, 1928. 



Travassos evidently prefers to accept Pratt's (1902) diagnosis of 

 the subfamily Plagiorchiinae rather than that of Looss (1899), 

 which was accepted by Baer (1924). The former allows somewhat 

 greater latitude, and 22 genera are placed in this group by Travas- 

 sos. Pratt's key was devised to include only North American forms ; 

 however, from a study of it the following diagnosis may be given : 



Subfamily PLAGIORCHIINAE Pl-att, 1902 



Suh family diagnosis. — Plagiorchiidae: Hermaphroditic distomes 

 in which the acetabulum is median and ventral. The ovarj^ is 

 anterior to the testes. The uterus usually extends posterior to the 

 testes and usually reaches the posterior end of the body. The intes- 

 tinal ceca are long, extending more than one-half the body length. 

 The ovary is usually located immediately behind the acetabulum or 

 beside it. The genital pore is near the acetabulum or in front of 

 it. There are no papillae or projections surrounding the oral aper- 

 ture. The intestinal ceca usually do not reach the posterior end of 

 the body. The cuticle is usually spiny. The excretory canal or 

 bladder is usually Y shaped. A cirrus sac is present. The esophagus 

 is long or lacking. The cirrus pouch extends posteriorly to, or be- 

 yond, the acetabulum. The extent of the vitellaria is variable. The 

 position of the testes with relation to each other is variable. 



With reference to the characters of the Plagiorchiinae, agreement 

 seems to be general upon one point, namely, that the subfamily 

 displays the typical anatomy of the family. The remaining sub- 

 families possess more or less distinct, divergent characters. 



The writer has reviewed descriptions and illustrations pertaining 

 to the 22 genera credited to the subfamily Plagiorchiinae by Travas- 

 sos, particularly with reference to the 9 genera comprising the "A" 



