346 Records of the Indian Museum. [VoL. XII, 
Gen. Dichogaster. 
Dichogaster malayana (Horst). 
(Plate xxxili, figs.35, 36). 
Neyyatinkara, Travancore, 28-vi-1g11. “Two specimens. 
Since the original description (7) of this species is short, and 
indeed omits mention of some organs or systems altogether, I give 
an account of the specimens in the present collection. 
External Characters.—lLength 30 mm., maximum diameter I°5 
mm. Colour grey with dark clitellum. Segments 92. 
Prostomium proepilobous, hinder margin projecting back- 
wards as an angular process into segment I; segment I partly 
divided in the midventral line by a median fissure leading back- 
wards from the margin of the mouth. 
The dorsal pores begin from furrow 5/6. 
The setae are closely paired and all ventrally situated. The 
relations may be expressed thus :—aa = bc = 3ab = 3¢d. 
The clitellum extends from segments xiii toxx inclusive. It is 
brown in colour, lighter along a midventral strip, and sharply 
marked off by a constriction at both ends. 
The prostatic apertures, on segments xvii and xix, are minute 
dots between the lines of setae a and b (? in line with a). The 
seminal grooves are straight, with only a slightly wavy course. 
The male pores were not visible. There are indications of slight 
transverse grooves between the prostatic pores of the same seg- 
ment, and thus a rectangular figure is outlined on the male area. 
The female aperture is perhaps in line with the setae of seg- 
ment xiv, single and midventral (?). 
The spermathecal apertures are in furrows 7/8 and 8/9, oppo- 
site the interval ab. 
Internal Anatomy.—One specimen was dissected and the other 
sectioned. 
The first septum probably represents 4/5; it is attached at 
the level of groove 4/5 below, but at that of 3/4 above. The next 
is septum 7/8, which envelopes the gizzard. Septa 10/11 to 12/13 
are slightly thickened. 
The oesophagus is bulged in an annular fashion in front of the 
gizzards. ‘The gizzards, in segments vi and vii, are not well divid- 
ed from each other; no septum is attached between them, and 
the separation is evidenced (apart from the examination of longi- 
tudinal sections) only by the wall of the thickened tube yielding 
under manipulation at a level corresponding to the line between 
the two. In sections however the muscular coat is easily seen to 
be interrupted for a narrow space. The oesophagus is continued, 
straight and fairly narrow, scarcely bulging at all, as far as seg- 
ment xv, where it dilates somewhat. Calcareous glands, all of 
about the same size, are present in xv, xvi and xvii. 
