530 Mr. C. R. Narayana Rao on the Anatomy oj 



be simply water-conserving organs. Unfortunately, there 

 ■was not an oj)})ortunity to do any experimental work on the 

 physiology of these organs. 



There are three bigger gizzards occupying somites 12-14, 

 the first one softer and more conically built, and the hinder 

 two firm and spherical. The fourtli gizzard in somite 15 is 

 just half the size of the spherical one in front, and is hidden 

 from view. The wall of the intestine in somites lG-17 is 

 very muscular, and simulates the appearance of gizzards. 

 Enteric appendages are conspicuously developed, as in 

 D. somavurpatana and D. eleguns^ and the number of digi- 

 tate lobes present in any appendage may reach about ^0, 

 some of which at any rate are in an incipient stage of 

 development. The one feature about these appendages 

 ■which requires mention is the fact that these lobes become 

 ill some forms enveloj;e(l in a distinct peritoneal membrane, 

 ■which passes over the dorsal vessel, thus becoming organised 

 into a lobate gland. 



Tlie dorsal vessel iu somites 5-17 is greatly thickened, 

 and foUons a greatly tortuous course in somites 12-17. 

 The last heart is in segment 9 ; occasionally an additional 

 one in segment 10. There is a subneural vessel. 



Tbe testicular sacs lying in segments 9-10 are large, 

 spherical, opaque bodies, rather greyish, covered over dorsally 

 by the back-^vard detlection of septum 9/iO (PI. XV. fig. 3 c). 

 They meet over the dorsal vessel in the median line. From 

 the inner lower border of each vesicle is given off the spermi- 

 duct, -which is large, lying in two most intricately coiled 

 masses, each nearly as large as the testicular sac itself. 

 These spermiducal masses lie on the sides of, in close contact 

 vrith, the sacs and below the oesophagus. From the suboeso- 

 phageal mass the coiled vas deferens issues to meet the pro- 

 state, which is engrafted on a second testicular sac. The testis 

 of the spherical vessels is attached to their Iom er inner border, 

 closely adherent to the funnel, whose position is easily 

 detected by the iridescent or golden-yellow area from which 

 the muscles of the sacs radiate. The engrafted prostate 

 suriounds the second tubular vesicles on the top and the 

 anterior and posterior margins, the sides being free, and 

 extending ventrally only up to the point where the thicker 

 second vas deferens commences. The spermiduct belonging 

 to the spherical vesicle enters the engrafted prostate at 

 about half its height anteriorly. The cylindrical vesicle 

 pushes backward the septum 10/11 by about the length of 

 nearly two somites, and is encapsuled by it and two other 

 posterior septa. Owing to the prostates the entire structure 



