278 



MR. F. E. BEDDARD ON NEW SPECIES 



[Mar. 5,, 



The genital papillce (see text-fig. 85) are large and conspicuous ; 

 they occupy the xviith, xviiith, and xixth segments. They are 

 quadrangular in shape, with rounded angles, and each is continued 

 by a narrow ridge towards the middle ventral line. I traced the 

 sperm-ducts in the interior of the body as far as the segments 

 occupied by the genital papillae, in connection with which I pre- 

 sume that they open. But I am unable to fix more precisely the 

 point of opening. 



Text-fig. 85. 



XXIV 



3Iicroch(etits coJletti. 



I have not found it altogether easy, in view of the condition 

 of the specimen and my unv*'illingness to injure it, as it is a 

 type, to ascertain the position of certain of the internal organs. 

 Assuming that the single pair of sperm-sacs is in the xth seg- 

 ment, the strongly marked gizzard lies in segment vii. This 

 segment is followed by two very thick septa, which thus separate 

 seo-ments vii./viii. and viii./ix. The dorsal vessel is double in parts, 

 and in segment ix. each half is much dilated, and a heart-like 

 structure is formed precisely like that which I first described in 

 Microchcetus microchcetus* , and wdiich also occurs in other. species. 

 The last pair of lateral contractile hearts lies in segment xi. The 

 calciferous glands are in segment ix. 



The sper7nathecce, which are, as is the case with other species 

 of this genus, minute in size, open on to the boundary-line of 



* Trans. Zool. Soc. xii. p. 63. 



