1901.] or THE GENUS BBNHAMIA. 201 



exaggerated in the present species (text-fig. 15, p. 200), the condition 

 of the integument somewhat obscuring the actual orifices of the 

 spermiducal glands. The penial setas projected from the latter 

 precisely as in B. moorei. The groove which connects the two 

 spermiducal gland-pores of each side is straighter than in B. moorei, 

 and in the two not fully mature examples was perfectly straight. 

 The groove itself is a little difficult to see owing to the numerous 

 lines which divide up the ventral area into detached tracts. 



The internal structure of this worm also shows a few small 

 differences from both B. moorei and B. itiolensis. The two gizzards 

 are so close together that it is diificult to note their line of division. 

 Moreover strands of muscle pass over this line of division. I am 

 disposed to believe that the gizzards lie respectively in segments 

 vii. and viii. It is rather hard to be certain upon this point ; but 

 in any case I counted six septa in front of that which divides 

 segments xiv./xv. In front of the last of these six septa lies the 

 posterior of the two gizzards. It cannot therefore be behind the 

 viiith segment, though it is possible that the gizzard really lies in 

 vii. as in B. moorei. The calciferous glands are in segments xv., 

 xvi., xvii. They differ slightly from those of B. moorei, in that 

 the first and the third pairs are equal, while the middle pair are 

 rather the smallest. 1 observed no difference of colour such as 

 distinguishes the first pair of these glands in B. moorei. The 

 intestine in this species commences in segment xix. There is 

 apparently no difference from B. moorei, as far as I can see, in this 

 particular. 



The organs of reproduction are, moreover, much the same. I found, 

 as in B. moorei, masses of sperm in segments xi., xii. I could find 

 no wall to these masses, which seemed to be merely freely floating 

 and agglomerated heaps of developing spermatozoa freed from the 

 testes. I have adverted to the very small size of the sperm-sacs 

 in B. moorei. In the present species I could not discover them at 

 all ; they must therefore be small if present. It is remarkable that 

 in mature examples of both species the sperm-sacs are so small, 

 and that both concur in having large and freely floating masses of 

 sperm. In B. itiolensis, Michaelsen was unable to record the 

 position and appearance of the sperm-sacs ; while in Benhamia 

 viridis and Trigaster lanhesteri the sperm-sacs, dwindling as it 

 appears in the former three species, have entirely disappeared. 

 The sjpermidiical glands are very large and massive. Each of them 

 occupies two segments, the connection between the two masses 

 being by a single loop of the tube which perforates the septum ; 

 thus the appearance of four pairs of glands is produced. The 

 arrangement is obviously not quite the same as has been flgured 

 by Michaelsen in B. itiolensis. But in the so-called variety 

 ccerulea, the same arrangement as that characteristic of B.johnstoni 

 appears to occur. The jpenial setce of the present species are quite 

 different in form from those of B. moorei, as will be seen from a 

 comparison of the accompanying drawings (text-fig. 16, p. 205). 

 The general form and the remarkable straightness is the same in 



