184 TAPEWOnVS OF HARKS AM) U A li HITS— STILES. 



2. Tbe second si)e<*ies, C. perplexa, is directly intermediate between 

 the lirst and third, but 1 am unable to find connecting links between it 

 and the other foruis. The cirrus pouch is about two thirds as large as 

 that of C. peetiiiata and somewhat more distinct than that of C. rari- 

 abilis; the testicles are arranged in two triangles and extend laterally 

 beyoud the ovaries to the lateral canals, in general configuration of 

 the body it resembles (\ pevtiniita very closely, but is nnich shorter. 



3. ('. rdviabU'is rei)resents the last form of the seiies, presenting a 

 cirrus ])ou('h slightly smallei' than that of C. perplexa and testicles in a 

 (juadrangle which is eonhned entirely to the space between the oxaries. 

 It occurs in three dilferent forms as follows: 



{a) C. rariabiiis found m Lepus syliuUiciis with characters described 

 below, ]). 102, measuring up to 10 mm. broad, the segments always mucli 

 broader than long. 



{b) C. variabili.s angust<( differs from C. variabilh only in ])ointot size; 

 it measures onlj^ 2 mm. broad and the segments are about thiee tinies 

 as broad as long. This form 1 have never found with ova, and it may 

 be a case of arrested development. Those authors who take extenud 

 form as a speciHc character would be obliged to give this parasite spe 

 cific rank, but I am unable to admit this view. This variety is found 

 in Lepus .syhyitirns. 



(c) C. r(i)'i<(bili.s imbricata is the third variety, and is one due pioba 

 bly entirely to host inliuence. It is fonnd in LcjHts pidnstris in Florida. 

 The differences between thisfbiin and the tyi)e are but verysligiit; tlie 

 posterior margins are more scalloped, the segments more imbricate, and 

 the cirrus pouch slightly more distinct. 



CITTOTiENIA PECTINATA (Goeze, 1782 partim, Riehm, i88i), Stiles & Has- 



sall, 1896. 



(Plate XYI, tigs. 1-2; Plate XVII, figs. 1-2.) 



?17S1. Tfrnia acutissima, Pallas, Xeue nord. Beytriige, I, pp. 75-81, pi. in, fig. 25. 

 ITS.^, T. pcctinaia, Goeze, Verstich eiiuT Xatmgescliiclite d. Eingeweidew., pp. 363- 



3(58, pi. xxvii, figs. 7-13. 

 ?1800, Ahjselmi)itUua pecilimtus (GoEZE, 1782), Zedek, Erstcr Xaclitrag ziir Xalnig. 



d. Eiiigeweidewiiriuer, pp. 246-249. 

 ?1803, Halifsis pect'niata (Goeze, 1782), Zedeh, Anleitiing znr X^aturg. d. Eiiige- 



weidewiirmer, p. 332. 

 1810, Taniia h-porina' Kudolphi (in synoDymy), Eiit. Hist. Nat., II, Pt.2, p. 82. 

 1881, Dipylidium peciinatum (Goeze, 1782 partim), Kiehji, Zeitschr. f. d. gts. 



Xatnrwiss., 3 ser., VI, p. 200; pp. 575-583, i)l. v, figs. 4, 14; vi. figs 1. 7. 

 1891, Moirh'zia peclinata (Goeze, 1782 partim, Kiihni. 1881), K. Blaxciiai;i>, Mem. 



Soc. zocl. I'rance, IV, pp. 187, 445, 450-4.52, 457-4(50, figs. 26-30. 

 1893, Ctenotania pectinata (Goeze, 1782 partim. K'ichm, 1881), Haili.iet, Traitc de 



Zool. mod. et agric, I, pp. 278-279. 

 1896, Cittotania pcvlinata (Goeze, 1782 partim, L'iehm, 1881), Stiles A: IIassall, W't- 



erinary Magazine, III, p. 407. 



'Blanchard (1891A, p. 457) has already shown that Limhonrg (1766) did not use 

 Ta'iiia leporinu" as a si)t'citic name; the nanu- therefore dates froin li'iiiloljilii. isio. 



II 



