I 



THE EARJHWOliMS OF LAHORE. 495 



Helodrilus parvus. This remained the condition during January and 

 February 1914. Towards the end of February 1914 a few specimens of 

 barbadends form of Pheretima haicayana, and Pheretima heterochceta were 

 also picked up. Helodrilus caliginosus was met with now in very much 

 smaller numbers so much so that in May not a single specimen was found. 

 The various species of the genus Pheretima have increased in numbers in 

 the following order ; — 



Pheritima haioaijana, both typical and barbadensis forms, Pheretima 

 heterochceta, Pheretima posthuma. Pheretima hawayana forma typica was found 

 throughout in very large numbers, and Pheretima posthuma appears to be 

 in very much smaller numbers than all others. Helodrilus parvus is 

 always found with other forms as a small roundish worm. Not a single 

 specimen of Lampito mauritii was found, the time during which it is found 

 appears to be the months of August to November, for it was found by Lt.- 

 Col. J. Stephenson, d.sc, i.m.s., at that time.* 



Helodkilus (allolobophoka) CALiGiNostTs, Sav. 

 Forma trapezoides (Ant. Dug.). 

 Habitat. — Very widely distributed throughout the city of Lahore, was found 

 in very various localities, in gardens, in cultivated lands, in damp soil near 

 wells, under flower pots, large stones or wooden logs, but in all cases where 

 it was found, the soil was very much more damp than in the situations 

 where the other worms were found ; hence from the seasonal variations in 

 the numbers of this worm and the localities in which it was found it fol- 

 lows that the worm loves cold and moisture more than others. 

 External Characters. — 



Length — 105 — 140 mms., diameter 4-5^ mm. at the posterior end to 6 

 ..mm, in the anterior part of the body. 



Segments 133-190, usually about 145. 



Colour. — Very difl'erenfc in specimens from diflerent localities. It varies 

 from pale white to dark brown, usually dark brown to brown with a purplish 

 tinge, light brown ventrally ; clitellum distinctly paler and well marked. 



Prostomium epilobous {% — ^) with a furrow cutting off the backwardly 

 projecting tongue from the rest ; the prostomium is partly under cover of the 

 first segment. Segments i — vi consist of single annuli, the rest of two annuli 

 in some of the larger segments each annulus is again cut up in two by 

 a furrow. 



SetcB closely paired, 8 in each segment. 

 Median lateral distance is nearly equal to the median lateral while much 

 smaller than the median dorsal. 



(aa=4-5 a6=4-5 cd^ha) dd^=^ u nearly. 

 The first segment is without seti3e, but all the others have rather large 

 ones, the setse are quite distinctly seen even on the clitellum, size of the 

 setse varies, and by the size and appearance two types of setse o^an be 

 distinguished. 



1. Setse on the clitellum and segments ix, x, xi, xv, xvi especially setce 

 a and b are rather slender and very much pointed. The setse are very 

 much curved posteriorly, while nearly straight at the free anterior end, in 

 some cases a little bifurcation of the free anterior end is also seen 

 (Fig. 11, Plate 1). 



Size. — Length '8 — '9 mm. 



Thickness -0208— "0260 mm. 

 Thickness at the nodulus "0364 mm, 



* Since the above was written, I have secured specimens of this form in Lahore 

 during- the months of October and November 1915. 



