912 THE VOYAGE OF H.M.S. CHALLENGER. 



On each side of the oesophagus is a series of arborescent hepatic vesicles. 



On each side of the central neural cord is a series of saccular bodies (te) that I take to 

 be the testes, these increase in size but suddenly disappear about the level of the second 

 pair of gnathopoda. Corresponding with the first pair of pereiopoda Suhm has figured 

 two symmetrical convoluted tubes that he considers and labels testes (fig. 76, te), and figures 

 them as passing to the coxal joint of the posterior pair of pereiopoda. 



It is probable that when Suhm examined the animal it was in a state better adapted 

 for observation than it is at present, after having been preserved in Canada balsam for 

 some time. The remains of these tube-like vessels still exist, but they are disrupted and 

 not symmetrically continuous in the specimen from which I have taken my drawing, one 

 side being more perfect than the other, but neither of them was continuous to the 

 posterior pair of pereiopoda, as shown in Suhm's figure. Assuming that they are portions 

 of the tubular structure figured by Suhm, I am inclined to think that they are the 

 spermatic ducts that, when perfect, are continuous with the testes shown at the anterior 

 portion of the pereion. 



The nervous system is fairly shown in several specimens in the collection, and 

 especially in PI. CXLVII. fig. 2. The cephalic ganglion, or rather mass of ganglia, 

 appears to be of a more concentrated and solid character than in other younger specimens, 

 and the ocellus is reduced to a small point situated above the anterior portion ; from this 

 mass neural threads are seen to pass to the ophthalmopoda and the first and second 

 antennas ; from the posterior margin two cords arise, one on each side of the median line, and 

 pass round and meet behind the oesophagus, where there are three or four ganglia 1 situated 

 in close succession and connected by short double cords and surrounded by a mass of 

 neural tissue sending off nerve threads to the mandibles and siagnopoda ; from the 

 posterior of these ganglia, the two cords proceed, lying close together so as to appear but 

 one, until between the first pair of gnathopoda, where they appear to swell out in the 

 form of an elongated ganglion, and on each side, as in the preceding, nerve threads are 

 sent off to the lateral appendages ; in this as in the others these threads do not spring 

 from the central oanolion but from a surroundino; mass of neural cell tissue. From the 

 ganglion between the first pair of gnathopoda the central nerve-cords pass as one in the 

 median line between the second pair of gnathopoda, where there are two distinct ganglia 

 surrounded by a mass of neural cells, that supply nerve branches to the lateral appendages ; 

 from these ganglia the central cord proceeds as two separate threads to two ganglia 

 situated between the first, second, third, and fourth pairs of pereiopoda, beyond which I 

 was not able to determine them, although traces of other ganglia are apparent between 

 the posterior pair of appendages. 



1 These ean«lia I oiv"ht to have drawn a little further forward. 



