■106 RHINODRILUS TENKATEI. 



moreover there lies a typhlosolar trunk above the intestine 

 behind the gizzard. The dorsal trunk is a simple tube , 

 which in the region of the intestine appears to be ampul- 

 late and tubular anteriorly. In the 12»'^ and 13"' segment 

 it gives off three pairs of large vessels , passing around the 

 intestine. However the commissural vessels around the 

 oesophagus, the » lateral hearts" seem to want here. The 

 subneural vessel , which exists also in Lumbricus , but is 

 absent in Perichaeta a. o. , is a very thin tube , only visible 

 in transverse sections. A vascular sinus could be detected 

 around the intestine, between the muscular layer and the 

 epithelium ; from this sinus the blood is collected in a 

 superior longitudinal vessel , the typhlosolar trunk. This 

 trunk gives off between the l^^ and 2nd, the 2nd and 3 '"J in- 

 testinal coecum , two pairs of large » intestinal hearts" pas- 

 sing around the intestine to the inferior ventral vessel. 

 The superior of the two ventral vessels lies close beneath 

 the intestine and seems to receive vessels , passing directly 

 from the wall of the intestine. 



EXPLANATION OF THE PLATE. 



Fig. 1. General view of the contents of the body-cavity of 31. Houfenii 

 Horst (natural size); ne. nephridium; sp. spermatheca ; jr. seminal 

 reservoir; pr. prostate gland; ro. receptaculum ovorum?;^. gizzard. 



Fig. 2. A. nephridium of the same species. X 3 diam. 



Fig. 3. A pair of setae of the same species. X 36 diam. 



Fig. 4. Side view of the anterior portion of the body of 2?/*. TeukateiMioTsi. 

 X 3 diam. 



Fig. 5. General view of the internal organs of the same species; the ne- 

 phridia in the posterior segments have been omitted (X 4 diam.); 

 ne. nephridium; ?/j. spermatheca; sr. seminal reservoir; oo. ovarium; 

 od. oviduct. 



Fig. 6. The two pairs of seminal reservoirs of the same; on the left side 

 a great part of them has been removed to show the ciliate roset- 

 tes and the sperm-ducts. 



Fig. 7. a. A penial seta; b. an ordinary seta of the same. X 50 diam. 



Fig. 8. A nephridium of the same. X 23 diam. 



Notes from the Leyden Museum , "Vol. IX. 



