204 ME. F. B. BEDDAED ON THE STE1JCT1JEE [Mar. 5, 



The genital pajnllce are, as figured by Bourne, four pairs. He 

 does not mention, however, certain slight differences in the 

 position of the different pairs. The first pair, i. e., those lying 

 between segments xv./xyi., and the last two pairs correspond in 

 position to the outermost of the two ventral setae ; that is to say, 

 a line drawn from this seta would pass through the middle of the 

 papilla. On the other hand, the second pair lie between the two 

 setae of the ventral couple. As Bourne states, the two anterior 

 pairs of papillae are much more marked than the two posterior 

 pairs. 



I find the position of the oviducal pores rather different from 

 that illustrated by Bourne. Each lies in front of the inner seta of 

 the ventral couple ; it is noteworthy, perhaps — in connection with 

 the remarks that I have made above concerning the asymmetry of 

 the oviduc'al pores of T. nicholsoni — that in the present species 

 the left-hand pore is decidedly the larger. 



The excellent condition of preservation of my specimen enables 

 me to add a few details to our knowledge of the internal anatomy 

 o£ this species. 



I find that the arrangement of the septa is a little different from 

 that described by Bourne. The first plainly recognizable septum, 

 which is also fairly thick, separates segments v. and vi. Then 

 follows a much stouter septum, which limits anteriorly segment 

 vii., in which segment lie the spermathecae. Behind the sperma- 

 theca and attached to the anterior end of the gizzard is a thin and 

 delicate septum. The gizzard therefore occupies segment viii. 

 It is followed by three thickened septa, to the first of v\hich it is 

 attached by two symmetrically placed strap-shaped bands of 

 muscle. The position of some of the organs of the body is a little 

 difficult to ascertain, and appears to vary from what I have described 

 above in T. nicholsoni. 



I believe Bourne to be right in placing the anterior end of the 

 sperm-sacs in segment xi. ; they extend back to xiii. There is, 

 however, no real anomaly inasmuch as these sacs are not attached 

 to septum s./xi. ; they may be considered to belong morphologically 

 to segment xii., from which they have grown forwards as well as 

 backwards. The calciferous glands I should place in segment xii. 

 The last hearts are in xiii. 



I find five pairs of intestinal glands — not four as Bourne has 

 stated ; they are bilobed, the furrow being transverse. 



The several species of the genus Typhoeus show a very considerable 

 uniformity of internal structure, combined with a marked variation 

 in the numbers and the arrangement of the genital papillae. Un- 

 fortunately data are wanting as to the internal structure of 

 Typlioeus Icevis, and several details of importance from a systematic 

 point of view have been left undescribed by myself in T. orientalis, 

 which, however, as the first known species of the genus was amply 

 characterized as such. The only real difference in the internal 

 structure which can be deduced from our present knowledge is the 



