<5> 117. THE HELMINTHES, 125 



They send oflf two varicose Yasa deferentia to the posterior portion of 

 the body, Avhere, after uniting very probably with the neck of an odd 

 elongated vesicle (Vesicula semi7ialis?), they are prolonged into a copula- 

 tory organ/^' There are six pyriform bodies, which secrete a finely-granu- 

 lar substance, and are attached behind the testicles to the Vasa deferentia. 

 Their six excretory ducts successively unite, ending finally in two which 

 open into the copulatory organ/^' The penis is usually folded inward, but 

 when projecting outwardly, it is a muscular, cup-shaped appendage, whose 

 fossa receives the posterior portion of the body of the female during 

 copulation/''* 



The spermatic particles are developed after the usual mode ; they are 

 filiform and very active, and quickly die in water, interlcoping and 

 twistino; tosrether/'' 



The very adhesive, viscous, yellowish-brown wax-like substance, often 

 found about the vulva, is apparently the secretion of the pyriform bodies 

 during copulation/** 



§ 117. 



With the Nematodes, the genital organs consist of a long, simple or 

 partly double caecal tube, which winds around the straight intestine. 



In the female it has the following parts : Ovariivm, Tuba Fallopii, 

 Uterus, and Vagina; and in the male. Testes, Vas deferens, Vesicula 

 serni7ialis, and Ductus ejaculatoriiis. 



With Trichosoma, Trichocephalus, and Sphaerularia, the genital tube is 

 simple in the females, and usually so in the males. But in Filaria, Asca- 

 ris, Strongylus, Spiroptera, Oxyuris, and Anguillula, the ovary, Fallopi- 

 an tube, and uterus, are double.*^' In the females, the ovary is the poste- 

 rior portion of this genital tube, and in its terminal portion are small round 



4 With Ecliinorhynrhus strumosus, these two andi Ascnris paucipara, 1 have found the female 

 round testicles are side by side. Having always organs likewise simple. When these organs are 

 found the odd, long vesicle empty, I cannot decide double, either one uterus with its ovary and ovi- 

 whether or not it serves the function of a seminal duct passes in front from the simple vagina, while 

 vesicle. the other passes behind, as is the case with^scaris 



5 These si.\ pyrifoi-m bodies were formerly taken brevicaudata, ni^rovenosa, Oxyuris vermicu- 

 for seminal vesicles ; see IVestrumb, de Helminth, /oris, Spiroptera anthuris, Slronsylus auricu- 

 Acanthocephalis, p. 55, Tab. III. fig. 24; and /oris, and striatus ; or both pass side by side 

 Nitzscli, in £rsch and Gruber's Encyclop. VII. behind, as in Ascaris aucta, mi/stax, lumbri- 

 1821, jilate for the Acanthocephala, fig. 2, 3, i. cotdes (Cloquet, Anat. &c. PI. 1. fig. 2) and aus- 

 With Ecninorhynchus claviceps, I have found culata. W^ith Cucullanu.t elesanit, and micro- 

 only one of these bodies. cephalus (from the intestine of Emyx lutaria), 



B The copulatory organ, which protruded has the uterus alone is double ; one horn terminating 



mostly an oblique direction, has been very exactly posteriorly in a caecum without an ovary or Fallo- 



figured by JJiijardin (Hist. d. Helm. p. 493, PI. plan tube, while the other, which has these parts, 



VII. fig. D, 1, D, 2). passes in front. There are, moreover, species of 



<■ For the spermatic particles of the Acanthoce- Ascaris into whose vagina open three or four geni- 



phali, see my observations in Mailer's Arch, tal tubes. Thus with Ascaris microcephala, I 



1836, p. 232. have seen the uterus divide upon reaching the 



8 This waxy substance incrusts sometimes the vagina into three tubes, each having an ovary and 



whole caudal extremity of females ; this is so with oviduct. According to Nathusius (IVie^mann's 



Echinorhynchus s;i^as, and globocaudatus ; see Arch. 183", I. p. 57), the uterus of Filaria labiata, 



Cloquet (Anat. &c. &c. p. 100, PI. VIII. fig. which is at first simple, divides at its posterior ex- 



4, 5) and Nitzsck (fViegmann's Arch. 1837, I. tremity into five tubes. 



p. 64.* The double uterus of Slronsylus inflexus has, 



1 For the simple genital tube with its various posteriorly, numerous constrictions, giving it a 



parts of the female of Trichocephalus dispar, see moniliform aspect. 

 Mayer, Beitr. &c. Taf. II. With Filaria rigida, 



* [ § 116, note 8.] For some further details on animal nouv. ddit. Zoophytes, PI. XXXV. fig. 3b, 

 the genitalia of the Acanthocei)hali, see Blanchard 3^, 3ii, 3«, 3f). — Ed. 

 (Ann. d. Sc. Nat. 1849, XII. p. 23), and R^ne 



