530 Records of the Indian Museum. [Vol. XXIV, 



female opening between 29 and 30. They are both very small 

 and hidden in the furrow, so that the specimen had to be 

 strongly bent dorsally to make them discernible. 



The nephridial pores could not be observed. 



The ambulation is practically the same as that given by 

 Castle (6) for Glossiphonia parasitica. Somites i and ii are uni- 

 annulate, somites iii and iv biannulate, somites v-xxiv trian- 

 nulate, somites xxv and xxvi biannulate, and somite xxvii 

 uniannulate, giving the total of 71 rings. Castle regards somites 

 xxv and xxvi as uniannulate each, which reduces the number 

 of rings to 69, but as these somites were divided, in his speci- 

 mens too, into a broad anterior and a narrow posterior portion 

 at the margins, the difference is more apparent than real. The 

 oral sucker occupies the ventral surface of somites i— iv . The 

 anus lies just behind the last (71st) ring. 



The surface is on the whole rather smooth; in this respect 

 the specimen comes nearer to var. plana than to var. rugosa. 

 The dorsal surface is covered with numerous papillae, but they 

 are all exceedingly low, and there seems to be no regularity as to 

 their arrangement. The colour is a uniform pale gray. 



One striking peculiarity in this specimen is that, on the 

 ventral surface, the furrow separating the first and second 

 annuli of each somite is markedly less deep than the others, in 

 consequence of which the body appears, when viewed from this 

 side, to be composed of double and single annuli arranged alter- 

 nately. This is one of the rare instances among the Hirudinae 

 where the somite limits are externally recognizable at a glance. 

 On the dorsal surface, however, all the furrows appear quite 

 alike, rendering it impossible to distinguish the inter-somital from 

 interannular furrows. A similar condition was also noticed by 

 Castle in some of his specimens of Placobdella parasitica, in 

 which the anterior two-thirds of a somite appeared at places like 

 a single broad annulus, but this character seems to have been 

 present in his case on the dorsal as well as on the ventral surface 

 of the body and not confined to the latter as in the case of our 

 specimen. 



Trocheta quadrioculata, sp. nov. 



localities : — Central region of Inle Lake. ■ ' Colour blood-red." 

 One specimen. 



Central region of Inle Lake on muddy bottom, 9-12 ft. One 

 specimen. 



Shape and dimensions. Both specimens are small and seem 

 to be immature. The body is long and slender, almost cylin- 

 drical, being only slightly wider in the middle than near the 

 extremities. The head is rounded in front, forming the anterior 

 lip. of the spacious mouth. The hinder sucker is almost circular, 

 a little broader than long, and is directed ventrally and back- 

 ward. 



The specimen from g-12 ft. measures 24 mm. in length and 



