242 l)r. AV. I>. Beiiham on an 



diuTii is siriiilnrly situated >vitli ve<,'ard to tlie second ciliated 

 losettes. 



1 did not trace out tlie following nepliridia, and am nnalile 

 to say definitely Low many tliere are in this series. Beddard 

 found fourteen pairs in li. GuUelmus following the pepto- 

 nephridiuni, differing from it and also from the following 

 series, which, commencing in somite xvii., are smaller, have 

 no long duct, and are less readily followed. 



The ctlimentary tract (fig. 2) presents a gizzard in somite 

 vii., as determined by tracing out the nepliridia ; it lies, how- 

 ever, at the level of somites viii., ix., x., appearing to occupy 

 tliree somites, as Horst describes for R. Tenhatei ; but the 

 present species agrees with the other two in having the 

 uizzard confined to one somite. 



Jnimcdiately behiiid it there arc the characteristic paired 

 diverticula of the tubular intestine (figs. 2 and 3, div.) ; they 

 contain crystalline particles which 1 took to be carbonate of 

 lime J but I obtained no effervescence on treating the organ 

 with Aveak and with strong acid. Nevertheless they have a 

 structure closely similar to that of the oesophageal (calcareous) 

 diverticula — " glandcs de Morren " — in Lumhn'cits, as my 

 predecessors have noted. In the present specimen there are 

 atven 2:a{rs of these diverticula, all very close together, though 

 probably occupying as many somites. The first gland is 

 small and ventro-laterally placed, and might readily be over- 

 looked in a strictly dorsal view ; the next three are larger 

 and kidney-shaped ; the following three gradually diminish 

 in size and are hemispherical. Both in R. Tenhatei and /». 

 Guliehnus there are six pairs of these diverticula, agreeing in 

 the main with those just described; and it is a most curious 

 fact that in the ^' type " of the genus Perricr makes no 

 mention of them. It is true they are hidden by the sperm- 

 sacs and " hearts ; " and as all these organs are closely packed 

 together, it is reasonable to think that they were overlooked, 

 though I believe, as I state below, that he did see these 

 glands, but mistook them for " hearts." 



It is not easy to fix the true position of these diverticula 

 with regard to somites, and it can only be really decided by 

 making longitudinal sections through a complete uninjured 

 sjiecimcn. But by tracing other organs we can place them 

 in somites viii. to xvi. or in ix. to xv., which agrees pretty 

 wcW with Beddard's species, in which he t'ouiul the six pairs 

 to lie in somites ix. to xiv. 



The sacculated region of the intestine begins shortly behind 

 these glands and is provided \\\x\\ a ti/j /i/otiole, lairly well 

 developed, compressed so as lo be a thin membraiie, and 



