4 CALIFORNIA ACADEMY OF SCIENCES. 



tiiict ill tlu' otiier.s. In segment \'l the forking is so deep that it nearly 

 divides tin- vessel in two (Fig. 4, 1 to VI). In .segment VII the forking is 

 perfect, antl from that tnuanl the end of the body wi; iind in every segment 

 two distinct pairs of lurigastric vessels. Each of these vessels again are forked at 

 the ai)ex, and feathered — that is, besides the forking at the apex, it emits two pairs 

 of side branches. All these secondary' perigastric vessels end blindly in the peri- 

 gastric cavity and do not connect directly with the ventral vessel (Fig. 5). 



The ventral vessel is not pulsating. It is forked in segment ^'II1. the 

 forks again uniting with the dorsal vessel in the cq)halic lobe (Fig. 4). A similar 

 forking of the ventral vessel is known in tlie other genera of Lunibriculidie. The 

 two forks of the dorsal vessel are again connectetl by secondary perigastric vessels 

 (Fig. 4^ V. pr. v.). which, however, in no way connect with the dorsal vessel or its 

 secondary perigastric vessels, hi Rhytichehnis Umosella'^ as well as in Phrreatothrir f 

 the coiilrary takes place. Here the secondary ventral vessels connect the ventral 

 forks with tlie dorsal pulsating vessel. My ob.servations on the transparent Sutroa 

 satisfy nie jiositively that my above description is correct, and tliat tlie dorsal and 

 ventral vessels are not united in those segments. The blood in all the vessels is 

 lively yellowish-icil. 



The (linnentanj aiiuil is exti-eiiicly simple, consisting of a simple duct. In tin' 

 twelve anterior segments this iluct is narrow and quite pellucid, but in liie thir- 

 teenth segment it is considerably enlarged and continues so toward the posterior 

 part of the body. In the same segment we lirst meet with gastric vessels. 



The nervous si/stem resembles that of Ixhijnchelinis. The two ventral nerve 

 cords are, as in EclipklrUm, connected by numerous anastomosing commissures. 

 The cephalic yanylio II is rather long and narrow. No lateral nerves project from the 

 ventral nerve cord. 



Generative Sysletn. — The sexual organs are of two kinds — c/enerative and recep- 

 tive. The generative include: 



Testes, ovaries and allnnniniferoits (]laiul. 



The re(;(.'|)tive are: h'(l'trtiit ilucls, with atriuiii and scnii mil reside; oriilucts and 

 7'ecejititcks. 



*Vkjiiov»ky: AuutoiuiHcUe Htiiilieii. Ithynchtlmut. ZeitHoli, (. w. Zoi>l. IM. XW'II, 'rut. XXl, Fi^. 1. 

 tTlioHaiiie. Vvhex Phrtululhrix. Sniui', It.l. XXVII rnf XXXIX, Fib. 2. 



