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ME. H. N. MOSELEY ON THE ANATOMY AND 
A, A. Lateral glandular masses. 
E. C. M. External circular muscular layer. 
E. L. M. External longitudinal layer. 
K. M. Eadiating muscular fibres. 
I. L. M. Internal longitudinal muscles. 
E. Epidermis. 
T. Testes. 
OD. Oviduct. 
W. Water- vascular space. 
D. Central or gastro-intestinal canal. 
D'. Lateral diverticula given off from central canal, 1). 
Fig. 7. Section transverse to the longer axis of the body of Rhynchodemus Thwaitesii, at 
a spot a little below the commencement of the series of testes. The ambu- 
lacral line does not in this case form a projection as in B. Diana ; indeed the 
organ is here in a comparatively rudimentary condition, and does not possess 
the peculiar muscular arrangement described as existing in Bipalium ; but 
its situation is marked by an entire absence of pigment in the part of the 
animal’s body corresponding to it. These spots are seen on the superior 
surface (one median, two lateral), where there is a special concentration of 
dark pigment. These form the longitudinal dark stripes with which the 
animal’s body is marked. A special development of the most external 
muscles may be observed here, as in Ri'palium Diana, about the median 
dorsal and infero-lateral region, with a corresponding development of internal 
longitudinal fibres. 
Only one of the diverticula (D) of the intestine is laid open, viz. that on the 
left side of the section. On the right side the septum is entire, and shows 
its decussating fibres. The water- vascular trunks (W) are seen to be connected 
by a transverse tract. The peculiar elongated glandular bodies, deeply stained, 
are seen to be abundant over an irregular arc around the testes on each side, 
and also just above the central digestive canal ; at the lateral margins of the 
section some are seen passing towards the epidermis. 
E. Epidermis. 
E. L. M. External longitudinal muscles with external circular epidermis. 
P. Pigment. 
E. M. Eadiating muscular fibres. 
I. L. M. Internal longitudinal muscles. 
T. Testis. 
OD. Oviduct. 
W. Water-vascular trunks. 
X. Peculiar protoplasmic bodies. 
Fig. 8. Central region of vertical section of Dendrocoelum lacteum, taken in a direction 
