150 



ONYX AND DIPELTIS, 



to the walls of the body, the facts being as 

 follows. The species of Dorylaimus, as they 

 ordinarily come under observation, present 

 a rather low lip region, offering anteriorly 

 no very remarkable peculiarities. An 

 examination of the figures given by various 

 authors of various species of Dorylaimus 

 soon discovers a peculiar loop-like appear- 

 ance apparently inside the head just behind 

 the base of the lips. I say apparently, for 

 these loops, which are visible in whatever 

 position the animal be viewed, are in reality 

 the optical expression of an infolding of 

 the skin, — exactly such an infolding as 

 occurs in the skin of a turtle's neck when 

 the head is drawn partly within the cara- 

 pace. The extended condition of the head 

 of Dorylaimus latus* an unpublished Australian species, are 



Fig. 6.— Extended condition 

 of the Head of Dory- 

 laimus latus. That por- 

 tion beyond the line 

 marking a transverse 

 constriction can be re- 

 tracted within the skin 

 of the posterior part. 

 The spear is slightly 

 protruded, and the ring- 

 through which it slides 

 is clearly shown, x 450. 



Dorylaimus latus, n. sp. 



•4 8-5 25* '52' 



„ - 1-75 to 2-5 mm. The trans- 

 it 3"o 45 4*6 2"5 



parent skin of this interesting species is destitute of hairs and is possessed 

 of a distinct, finely striated sub-cnticula in which are to be seen the struc- 

 tures denominated " pores " by Bastian. The pores did not seem to me to 

 perforate the outer cuticula. The neck is conoid to somewhat behind the 

 expanded lip-region, where it becomes convex-conoid. Each of the six lips 

 is, as usual, supplied with two papillae. I could observe neither eyes nor 

 lateral organs, unless, indeed, the latter be the external openings of the 

 glands which I believed to be discernible in the anterior part of the neck 

 when the head was protruded. Under those circumstances these organs, 

 each longer than the head, lay as far behind the fold in the cuticula as the 

 latter was behind the lips. Each appeared like a unicellular gland with a 

 short neck, indistinct ampulla and short chitinous lateral (?) outlet. The 

 pharynx and spear are normal. The oesophagus expands suddenly near the 

 middle, the anterior part being only one-fourth as wide as the neck, while 

 the posterior part is twice that width. The brownish-green intestine is 

 two-thirds as wide as the body, and is set off from the oesophagus by a 

 distinct constriction ; the intestine is composed of large cells filled with 

 small granules. The pre-rectal portion of the intestine is twice as long as 

 the adjacent body diameter, its anterior end being less distinctly marked 



