1 93 1.] T. Kaburaki : Notes on Leeches. 697 



respectively, and are closely apposed on each side. The first two 

 pairs are directed obliquely forwards, t?ie last pair obliquely 

 backwards ; all are turned awa^" from the median jilane. 



Dorsally the rings are marked, as stated above, by conical 

 papillae, which are of various size, and form a transverse row of 

 about 11-17 on every ring. In each transverse row the papillae 

 are arranged, as a rule, symmetrically, some being of larger size 

 and occupying a definite position on every ring, so that those on 

 successive somites form seven longitudinal rows, thiee in each 

 half of the body and one median in position, as is shown in text- 

 fig. I. The paired rows may be designated as paramedian, interme- 

 diate, and para marginal. The paramedian rows of non-pigmented 

 papillae are usually constant in occurrence with the intermediate ; 

 they fall on the first ring of each sorriite. The intermediate rows 

 occur upon the second ring of each somite, and usually contain 

 pigment. The papillae composing a median row exist on every 

 ring, though those on the first of each somite are often inconspicuous. 

 The paramarginal rows are less well-developed than an\^ of the 

 others, occurring on the first ring of each somite. This regularity 

 of arrangement loses itself as it proceeds towards both ends of 

 the body. 



The body presents a whitish colour in spirit, marked with five 

 longitudinal rows of dark-brown or black pigment-patches which 

 are arranged metamerically extending backwards almost through- 

 out from somite v. These patches mark most often the middle 

 ring of each somite in the position of the papillae forming the 

 median and intermediate rows, as well as at the lateral edge where 

 the dorsal surface passes round to the ventral. On some occasions 

 the median row is seen, without being interrupted, as a continuous 

 stripe. On the posterior sucker we find pigment-patches arranged 

 in some five radial stripes, which correspond to the median, 

 intermediate and marginal rows mentioned. In no case have I 

 been able to observe any trace of special sensory spots. 



The specimens had not been preserved in a state fit for the 

 purpose of minute examination. The mouth situated anterior to 

 the middle of the anterior sucker leads into the pharyngeal sheath 

 which extends posteriorly into about somite xii. In it lies the 

 pharynx which is of a cylindrical shape, terminating conically at 

 the free end. At the base the pharynx is furnished from both 

 sides with the ducts of the salivary glands scattered through as 

 many as eight somites, usually somites x-xvii. Posteriorly the 

 i:)harynx gi\es rise to the oesophagus, which is a tubular passage 

 opening into the crop, and much longer than that of Gl. hetero- 

 clita. The wall of the oesophagus is composed of columnar epithe- 

 lial cells closely set, surrounded by circular muscles. The crop is 

 provided with six pairs of lateral diverticula, one pair in each 

 of somites xiv-xix. In these diverticula there cannot be dem- 

 onstrated such a tendency to subdivide into two at the tip, as is 

 seen in Gl. heteroclita , except in the last pair which extend backwards 

 into somite xxiii and gives o.? about five secondary, outwardly 



