Memoirs of the Asiatic Society of Bengal. Zoological Results of a Tour in the Far East

As is well known the fixing of somite-limits has long been the subject of debate and an artifcial method of plotting out the somites by assuming the segmental sensillae to be on the first annulus was universally adopted until as late as 190o when Castle's important paper on the metamerism of the Hirudinea appeared in which the author pointed out the inadequacy of this procedure. [...] The alimentary tract resembles on the whole that of Haemopis the only considerable difference being in the size of the jaws. [...] From the position of the nervous ganglion which lies within one of the larger annuli it seems very probable that the three large rings are the second third and fourth annuli of the originally five-ringed somite and the four small rings correspond to the first and fifth annuli each subdivided into two. [...] In fact the number of eyes and the position of the mouth-opeing point rather toward a closer affinity with the latter but the general shape of the body and especially that of the comparatively large oral sucker speak in favour of its inclusion in the former. [...] The presence of numerous papillae the position of the genital orifices separated by two annuli the number and form of the gastric coeca even the parasitic mode of life with the tortoise as host are the same in both genera.