REPRODUCTIVE SYSTEM. 97 



the main branches proceeding from that plexus {d') formed 

 by the interbranching of the splanchnic and supra-splanchnic 

 nerves.* 



Olfactory sacks. — I can add nothing to the account given 

 of these organs under the Lepadidse : I saw them in all the 

 genera which I examined for this object. In Coronula 

 diadema the orifices are large ; they are seated in the usual 

 position (PI. 26, fig. 4, n), in the confluent segments, beneath 

 the free part of the outer maxillae, and somewhat exteriorly, 

 or as near as possible to the inner maxillae. Tn no sessile 

 cirripede are the orifices produced or tubular, as is the 

 case with several genera amongst the Lepadidae. I failed, 

 as heretofore, in tracing with certainty the nerve, which 

 appears to enter the base of the sack, to its ganglion. 



Reproductive System. 



Male Organs. — All the Cirripedes of the family we are 

 now describing, are bisexual or hermaphrodite ; and no 

 instance has been observed of the presence^ of males or 

 complemental males. I have very little to add to the ob- 

 servations made by M. Martin St. Ange and R. Wagner, f 

 and to those given in my former volume. The testes seem 

 always to be confined to within the thorax, including the 

 prosoma. With their ducts, they resemble club-moss or 



* I have always feared that, anatomists would reject my view of these organs 

 being acoustic, owing to the absence of otolithes ; but I observe that so high an 

 authority as Von Siebold ('Anatomie Comparee,' torn, i, p. 433) does not 

 believe that otolithes occur in the acoustic organs even of the highest Crustacea. 

 He considers an " ampoule volumineuse, a parois mince, remplie d'un liquide 

 transparent," and a " membrane tympanique," though having a fissure in the 

 centre, as sufficient. I may here remark, that the nerve proceeding from the 

 acoustic vesicle in Cirripedes, and apparently running to the splanchnic nerve, 

 may easily be placed in connexion with the antennular nerves, by the second 

 plexus (m) in figs. 1 and 2, pi. 27. I should infer from Von Siebold's remarks 

 on his ampoule volumineuse in the higher Crustacea, that my acoustic vesicle 

 answered to the labyrinth in higher animals. 



f The ' Report' on M. Martin St. Ange's memoir was laid before the Academy 

 of Sciences, July 14, 1834, so that I suppose it was read previously to this 

 date. K. Wagner's paper was published in 'Miiller's Archiv,' 1834, p. 467. 

 Burmeister's ' Beitrage zur Naturgeschichte der Hankenfusser,' was published 

 this same year, 1834; so that these three authors published almost contem- 

 poraneously. 



7 



