419] ANOPLOCEPHALIDJE—DOUTHITT 69 



Length, 6 to 30 mm. 35 to 55 proglottids. Cirrus spiny. 

 Sexual maturity reached about the 15th proglottid. Host, 

 Equus caballus, Europe. (See Stiles, 1896; and R. Blanch- 

 ard, 1891. ) „ A. mamillana 



24. Ovary consists of two practically separate lobes. Receptaculum 



seminis greatly elongated. Host, Equus caballus, Old 



World. (See Kahane, 1880.) A. perfoliata 



Ovary not bilobed 25 



25. (The better descriptions are not accessible to me; information 



compiled from several sources). 9 to 80 cm. long. Scolex 

 4 to 6 mm. in diameter. Maximum width, 5 to 20 mm. 

 Synonys: A. plicata, A. zebrae, etc. (See Scheibel, 1895.) 



A. magna 

 Scolex considerably less than 1 mm. broad. Maximum breadth 

 not over 5 mm „. 26 



26. Over 3 cm. long. Over 125 proglottids. Host, Geomys bursa- 



rius, North America. (See present paper.) JL variabilis 



Length, 12.5 to 20 mm. Number of proglottids, 60 to 75. Hosts, 

 Geomys bursarius and Microtus sp., North America. (See 

 present paper. ) „ A. infrequens 



27. Genital pores irregularly alternate. Length, 12 to 21 cm. Num- 



ber of proglottids, 250 to 300. Cirrus spiny. Hosts, Mus 

 arvalis and Mus amphibius. (See von Janicki, 1906; and 

 Stieda, 1862. ) — A. omphalodes 



Genital pores regularly alternate. Length, about 2 mm.; 

 breadth, about 0.34 mm. Number of proglottids, 50 to 70. 

 Host, pheasant, Italy. Description worthless; nothing to 

 indicate that it belongs even in the family, if it exists. (See 

 Mello, 1912. ) „ A. minima 



Genital pores unilateral „ 28 



28. Testes extending across median field. Length, 25 to 45 mm. 



Number of proglottids, 100. In Heterohyrax mossambica. 

 Most likely does not belong in this genus. (See Bischoff, 



1912; and von Janicki, 1910.) A. spatula 



Testes confined to the side away from the genital pore 29 



29. Length, 16 cm. Cirrus spiny. In Arvicola campestris. (See 



von Linstow, 1878; and von Janicki, 1906.) A., inermis 



Length, 3 to 4 cm. In Agricola campestris. ( See Moniez, 1891 ; 



and von Janicki, 1906.) _ A. blanchardi )/ 



Length, about 8 mm. Breadth, 5 mm. Number of proglottids, 

 40 to 50. In Arvicola nivialis, Italy. Description worth- 

 less. Species may not belong to family, if it exists. (See 

 Galli-Valerio, 1905. ) - - A. dentata 



