352 



THE CRUSTACEA. 



<§.292. 



ed as a Penis/''^ The length and mobility of this tail is such that it can be 

 used, with the Cirripedia, as a copulatory organ, and, being brought in 

 contact with the oritice of the oviducts, which is situated on the mantle, 

 self-impregnation may thus take place.* 



IL Female Crustacea. 



§ 292. 



The female genital organs of the Siplionostoma and Lophyropoda consist 

 nearly always of two long and sometimes flexuous ovarian pouches, situated 

 on both sides of the digestive Canal. The oviducts pass backwards and 

 terminate on both sides of the end of the body by separate orifices, or by 

 a single genital opening on the median line. With those species whose 

 body has a tail, these orifices are not situated like the anus, at its extrem- 

 ity, but at its base. Very often, they serve as the outlets of the excre- 

 tory ducts of two caecal organs which secrete a viscous substance by which 

 the eggs are glued together in clusters or chaplets.^'' Not unfrequently, 

 there are hook-like or capsular appendages near the genital openings, for 

 the retention of these clusters.'-^ But these are wanting with the Daphni- 

 oidae, there being in their place an incubating cavity, situated between the 



S Cuvier (Mira. loc. cit. p. 9, fig. 8) has taken, 

 with Lepas, the testicles for the ovaries, and tiie 

 Fasa de/erentia f.>r the testicles. This error could 

 not be rectified until the discovery of the true 

 ovaries (see Burmeister, Beitr. lue. cit. p. 33, 

 Taf. II. fig. 16 ; Wa-itier, in MülLer\i Arch. loc. 

 cit. p. 469, Taf. VIII. tig. 8 ; and Martin St. Ange, 

 loc. cit. p. 21, I'l. II. Lepas). It is more singular 

 to see Goodsir (Edinb. New Philos. Jour. 1843, Ju- 

 ly, p. 88, PI. III. IV. or Ann. d. Sc. Nat. I. 1844, 

 p. 107, PI. XV. C. or Froriep''s neue Notiz. No. 

 651, 1844, p. 193), endeavor to confuse this ques- 

 tion by declaring the hermaphrodite animals of 

 Balanas to be females which carry, in the cavity of 

 their mantle, dwarfish and abortively-formed males. 

 Very probably those so-called males are parasitic 

 Crustacea, as KöLliker (Schweiz. Denks. loc. cit. p. 

 33) has supposed. 



1 The female genital organs are complÄely double 

 with the Penellina, the Lernaeodea, the Ergasilina 

 and the Caligina ; see Nordmann, loc. cit. p. 6, 

 Taf. I. fig. 4, Taf. V. fig. 7, Taf. VI. fig. 10 {Lam- 

 proglena, Achtlieres aud Peniculus) ; Goudsir, 



Edinb. New Philos. Jour. July, 1842, p. 178, or Ann. 

 d. Sc. Nat. XVIII. 1842, p. 181 ; Kroyer, Naturh. 

 Tiilskr. I. PI. VI. or Isis, 1841, p. 194, Taf. I. 

 Tab. VI. fig. 4, C. (Caliarus); and Rathke, Nov. 

 Act. Nat. Cur.XI.X. p. U5,Tab. XVII. fig. 2 {Di- 

 chelestium). This last-mentioned author was the 

 first to notice the organs which, in various Crustacea» 

 secrete the viscous matter mentioned in the te.\t. He 

 found them liighly developed with the Nir.othos 

 (loc. cit. XX. p. 106), where they extend, with the 

 ovaries, even into the wing-like appendages of this 

 parasite. The ovarian follicles of Chondracanthuty^ 

 which are multiramose, differ veiy much from the 

 usual form {Rathke, Ibid. XX. p. 123, Tab. V. fig. 

 18). With the Cyclopidae, there is only a single 

 genital opening, although the ovaries and the or- 

 gans secreting the viscous matter, are double. But 

 with Arifulus, the female genital organs are the 

 most simple, consisting only of a single ovariaa 

 tube, opening at the base of the tail (Jurine, loo. 

 cit. p. 448, PI. XXVI. fig. 3).t 



1! Nordmann, loc. cit. p. 8, Taf. II. fig. 6 (Er- 

 gasilus). 



* [ § 291, end.] That the Ch-ripedia are not uni- 

 versally hermaphrodites, was first discovered by 

 Goodsir (Ed. New Phil. Jour. XXXV. p. 88), up- 

 on Ha/anus balaenoides. The male is very small, 

 and it is not strange that it before eluded observa- 

 tion. 



Darwin has made some researches, lately, with 

 1 similar result in some respects. E.xceptions to 

 the rule were found by this naturalist in the genera 

 Ibla and Scalpellum. With Ibla, the males lie 

 within the sac of the female, and have an elongated 

 body with a pedicle below. He has also obscrveil 

 that, with these genera, there are both females 

 and hermaplirodit<-.s ; and in some hermaphrodites, 

 males have been observed so similar in general 



character to those of Ibla, that he considers then» 

 to be true males of the species with which they are 

 connected.« Being thus supernumeraries, he ha» 

 termed them complemental males. As spermatic 

 particles were distinctly observed in them, their 

 male nature is clear, but it would not appear 

 equally clear that they really belong to the genu3 

 and species with which they are connected. Facts 

 so singular recjuire further research. See Darwin, 

 Monogr. &c. loc. cit. p. 207, 231. —Ed. 



t [ § 292, note 1.] For further details on the fe- 

 male genital organs of Argulns, with illustrations, 

 see Leydig, loc. cit. in Siebo/d and KöUiker's 

 Zeitsch. II. p. 339 Taf. XIX. fig. 6, a. Taf. XX. 

 fig. 8, 10. — Eu. 



