218 TAPE WORMS OF HARES AND RAB BITS STILES. VOL. xix. 



29. Two submedian ovaries in each segment 30 



One median ovary in each segment Amabilia. 1 



30. Several rows of hooks upon rostellum Dipylidium. 2 



A single row of hooks upon rosteUum Cotugnia.* 



31. Dorsal root of hooks much longer than ventral root or prong ; ventral root very short; 



hooks 8 to 12 (rarely to 26} in number; known only in birds Drepanidotwnia.* 



Dorsal root of hooks about the same length as ventral root and prong 32 



32. Dorsal root shorter than prong or ventral root ; hooks generally less than 20 in number 



(range from 10 to 26} ; genital pores unilateral or irregularly alternate ; known only 



in birds Dicranolamia. 5 



Dorsal root longer than prong or ventral root ; if rosteUum is armed, there are 24 to 30 

 hooks present ; genital pores unilateral (on left of segments) ; three testicles nor- 

 mally present in each segment ; retractile rostellum armed with minute hooklets or 

 rudimentary and unarmed; eggs with three envelopes ; parasitic in man, chiroptera, 

 insectivora, rodents, and insectivorous birds ; larval stage in insects or myriapoda. - 



Hymenolepis.* 



33. Hooks on suckers arranged in circular rows on border; hooks on rostellum resem- 



ble a hammer in form and are arranged in a double row; with four exceptions 

 known only in birds Davainea (p. 194), 35. 



'1893, Amabilia, DIAMARE, Boll. Soc. Nat. Napoli, 1. ser., VII (1-2), p. 13. August 



28, 1893. Type, Tcenia lamelligera, Owen, 1835. 

 ? 1896, Diploposthe, JACOBI, Zool. Auzeiger, XIX, No. 505, June 15, 1896, pp. 268-269. 



Type, Tcenia Icvvis, Diesiug. 



See Stiles, 1896, Bull. 12, Bureau of Animal Industry, p. 31. From the diagnosis 

 given by Jacobi I fail to see how Diploposthe diifers from Amabilia. 

 1863, Dipylidium, R. LEUCKART, Die menschlicheu Parasiten, I, p. 400. Type, 



Tcenia elfyrtica, Batsch, 1786 = Tcvnia canina, Linnaeus, 1758. 

 1858, " Alyselminthus, ZEDER, 1800 pp.," of Weinland with Tcvnia cucumerina, 



Bloch, 1782 Tamia canina, Liumeus, 1758, as type. 

 1884, Micro tcenia, SEDGWICK, as subgenus in CLAUS & SEDGWICK, Elementary 



Text-book of Zoology, I, p. 336. Type, Tamia cucumerina, Bloch, 1782 = 



Tcenia canina, Linnaeus, 1758. 



For species and bibliography see Diamari's monograph (1893) II Gen ere Dipylidium, 

 Lkt., Atti R. Accad. Scienze fisische e matematiche, 2 ser., VI, No. 7, 31 pp., pis. 

 I-III. 

 3 1873, Cotugnia, DIAMARI, Boll. Soc. Nat. Napoli, 1. ser., VII (1-2), p. 11. August 



28, 1893. Type, Tfenia digonopora, Pasquale, 1890. 

 See Stiles, 1896, Bull. 12, Bureau of Animal Industry, p. 29. 

 4 1892, Drepanidotcenia, RAILLIET, Bull. Soc. zool. France, XVII, p. 116. Type, Tcmia 



lanceolata, Bloch, 1782. 

 ? 1896, Choanotcenia, RAILHET, Rec. me"d. ve"t., 8 ser., Ill (5), March 15, 1896, p. 159. 



Type, Tcenia infundibuliformis, Goeze, 1782. 



For species and bibliography of this genus see Stiles, 1896, Bull. 12, Bureau of Animal 

 Industry, pp. 36-45, 60-61. 

 6 1892, Dicranotosnia, RAILLIET, Bull. Soc. zool. France, XVII, p. 116. Type, Tcenia 



coronula, Dujardin, 1845. 



For species and bibliography of this genus see Stiles, 1896, Bull. 12, Bureau of 

 Animal Industry, pp. 32-36. 

 6 1858, Hymenolepis, WEINLAND, Human Cestoides, p. 49, 52. Type, Tcenia Jlavopunc- 



tata, Weinland, 1858= Toenia diminuta, Rudolphi, 1819. 

 1858, Lepidotrias, WEINLAND, as subgenus of Hymenolepis, Human Cestoides, p. 52. 



Type, Tceniamurina, Dujardin, 1845, proposed by Weinland, but this subgenus 



includes the type of the genus. 



For species and bibliography of the genus see R. Blanchard, 1891, Hist. zool. et 

 med. des Teiriades du genre Hymenolepis, Weinlaud. Paris. 112 pp., 22 figs. 



