NO. 1105. PBOCEEDINGS OF THE NATIONAL MUSEUM. 183 



Head unarined, not very distinct from strobila, 0.43 mm. broad by 

 0.32 mm. long; rostelliim not observed; suckers O.IG mm, long by 

 O.lL'8 mm. broad. JSTeck short and broad. Segmentation begins about 

 0.50 mm. from tbe anterior extremity of bead. About 150 proglottids 

 present, very distinct; tbe posterior liap overlaps tbe anterior onetbird 

 to one sixth of the next following segment. Genital pores double and 

 opposite, not prominent, in about tbe middle of tbe lateral margin. 

 Male organs: Testicles numerous, contined to dorsal portion of median 

 field; cirrus pouch dorsal of vagina on both sides of segment, 0.21 mm. 

 long, muscular, containing globular receptaculum seminis (about 00 // 

 diameter) in its proximal portion; it extends to or slightly beyond the 

 ventral canal. Female organs: Female glands about halfway between 

 median line and ventral canal; vagina narrow, extends across ventral 

 canal, then dilates into a large receptaculum seminis; uterus probably 

 single, possessing blind proximal and distal pouches. Ova, 32 to 30 u 

 in diameter; bulb of pyriform body, S to 12 //; horns long and crossed. 

 Excretory system: Dorsal canal between ventral canal and nerve at 

 heiglit of the genital canals; genital canals cross dorsally, but uterus 

 crosses ventrally, of tbe longitudinal canals and n«nves. 



Hosts. — Pocket Gopher ('Oeo^y/y/s hursariiis (Shaw, ISOO) ), collected 

 by Herbert Osborne at Ames, Iowa. 



Types. — Bureau of Animal Industry cestode series Xo. 1079 desig- 

 nated as type and deposited in tbe United States National Museum; 

 paratype (1372, part in sections) deposited with type. Tecbni(ine of 

 types: Corrosive sublimate, alcobol, acid carmine. 



PEOTINATA OEOUP. 



The European form Cittotfcnia pectinnia forms, with certain American 

 parasites, a very compact group, but it is dithcult to know what rank 

 should be given to this division. Geiu-ric rank would be too high, 

 siiecific rank too low. I proi)Ose to include these cestodes in the Fec- 

 tinata group, which I base upon the peculiar cirrus ])()uc]i. 



Three species come within this group at present: 



1. Type species C. X)<-(^^^tlnata, as defined below, p. ISS, its chief cliar- 

 acters being the length of the cirrus puucb, the quadi'angular arrange- 

 ment of the testicles, and their extension beyond the ovaries to tbe 

 lateral canals. 



'Synonymy after Merriam: 1800, Mits hnrsarlns, Shaw; 1815,? .1/. ludorichniKS. 

 Ordway; 1817, Diplostoma fusca, Rartnesqiie; 1817, (leoniys ciiierea, RatinL-scine (.l/«.v 

 hiirsarius Ti-mimed) ; 1820, Saccopl^fnia bitrmrius, Knhl; 1-<21, Man naccatm, Mitcljill; 

 1823, Pseadostoma'burmrlns, Say; (1822) 1825, Ascomi/s caiindciiNix, Licbtenlell; H5L)> 

 Geovii/.s.' bitrsarius, Richardson; 1852, Geomi/s cauadeitsis, LeCoute; l><'y2, G.orvgoncn- 

 sis, LeConte. 



C. Hart Merriam, 1895. Monographic Revision of the Pocket Goidiers, Family 

 Georayidic (exclusive of tlie species of Tlioinoim/s), p. 120. Noitli American Fauna, 

 No. 8, Division of Ornithology and Mammalogy, United States Deparlment of Agri- 

 culture. 



