STUDIES ON EARTHWOEMS. 85 



which the canal gradually widens out again to form the typhlo- 

 solar region or sacculated intestine (fig. 14, y). This 

 commences in somite xxvi, and extends for a considerable dis- 

 tance backwards. The wall is much thinner than in the pre- 

 ceding region, and it is only slightly constricted as it passes 

 through the septa. The typhlosole commences and ends con- 

 currently with this division of the intestine. In somite xxvi 

 there are seen two small elongated cseca, the end of one appear- 

 ing on each side of the intestine (fig. 14, k). These spring 

 close together from the ventral wall of the intestine, near the 

 middle line, just at the junction of the pouched intestine with 

 the sacculated region, and pass outwards upwards (fig. 15, b). 

 They resemble the characteristic intestinal caeca found in 

 Perichseta, being narrow, cylindrical, with the free end 

 rounded. This is the first time, I believe, that these caeca 

 have been found in Intraclitellian worms, or, indeed, in other 

 genera than Perichseta. 



It is interesting to find a worm combining the two sets of 

 intestinal outgrowths — the "glandes de Morren^' found in 

 Urochaeta and these intestinal caeca of Perichaeta. It 

 would be interesting to ascertain the structure of these out- 

 growths, in order to compare them with that of the already 

 known outgrowths of the alimentary tract of various Earth- 

 worms ; but my specimens are not well enough preserved to 

 show their structure satisfactorily. The typhlosole is a 

 simple dependent fold, containing the usual blood-vessel, and is 

 not a cylindrical valve, as in Lumbricus, Microchaeta, &c. 



The Genital Organs. — Of these I was able to find only 

 some of the male organs (not the testes) and the sperraathecae ; 

 no ovaries nor oviducts were distinguishable. The seminal 

 reservoirs are four in number, one pair lying in somite xii 

 and XIII, and the second pair in somite xiv (fig. 17, g) ; they 

 have a looser structure than those of Lumbricus, and a much 

 more irregular outline ; they are not so intimately connected 

 with the septa as in the latter form, and so are easily displaced 

 and broken. 



The ciliated rosettes are, similarly, four in number, are 



