598 ORDER APODA. 



terior extremities, to the ovarian sack, and I believe open 

 into it ; but I cannot say that I demonstrated this. From 

 their absolute identity in structure, and similarity in posi- 

 tion, namelv. on each side of the lower end of the ceso- 

 phagus, no doubt is left on my mind that these bodies 

 answer to the true ovaria, which are situated within the 

 body of other cirripedes ; and that the ovarian sack answers 

 to the inosculating and branching ovarian tubes and casca, 

 which fill the peduncle, or cover the basis in other cirripedes, 

 but here, from the absence of these parts, necessarily occu- 

 pying the body. 



Male Organs. — The whole surface of the ovarian sack, the 

 space before it, even to within the lower parts of the mouth, 

 the posterior half of the last thoracic segment, and espe- 

 cially the whole three abdominal segments, are completely 

 netted by branching delicate vessels or ducts terminating 

 in spherical glands about ^th of an inch in diameter. 

 These little glands include a brownish pulpy centre, and 

 sufficiently resemble the testes of other cirripedes in 

 appearance, position, and connecting ducts, to make me 

 believe that such is their nature. I may remark that 

 in the more central parts of the abdomen the glands and 

 ducts seemed to be in process of formation by the con- 

 fluence of cellular matter, and in some other cirripedes 

 I have suspected that the testes are periodically renewed, 

 or at least redeveloped from an undistinguishable condition. 

 Within the posterior half of the abdomen, some of the ducts 

 become thicker and unite, others joining in laterally, so as 

 together to make a dark chord, ^ths of an inch in diameter. 

 Until dissecting this chord, I thought it was a single vesicula 

 seminalis, but it separated into several rather thick ducts 

 or vesicular. I was not able to remove from within them 

 the contained matter, but it appeared very finely and longi- 

 tudinally flocculent, like spermatozoa not quite matured. In 

 accordance with the immature state of the contents of the 

 ovarian sack, in all probability these ducts would hereafter 

 have become greatly enlarged, and have formed a compound 

 vesicula seminalis of considerable size. The dark chord, 

 formed by their union, contracts as it enters the rudi- 

 mentary penis, and terminates in a very minute orifice on 



