1917*] J- Stephenson : Indian Oligochaeta. 415 



The female and spermathecal apertures were not visible. 



Internal anatomy. — The first septum distinguishable by dissec- 

 tion is 5/6, which is somewhat thickened ; 6/7 is considerably thick- 

 ened, 7/8, 8/9, and 9/ro are all very strong, lo/ii is about equal to 

 6/7, and 11/12 to 5/6. The next two septa, 12/13 and 13/14, are 

 also slightly thickened. 



The gizzard occupies segments xvii, xviii and a small part of 

 xix; it is firm and cylindrical. The typhlosole is simple and 

 rounded. 



The oesophagus in segment x is swollen , and, besides the 

 general swelling of the tube, there are a pair of small yellowish pro- 

 jections on each side of the dorsal vessel and in front of the hearts ; 

 in segment xiii the tube is also distinctly bulged, in an evenly 

 rounded manner, and is vascular ; in xiv it is quite narrow. On 

 opening up the oesophagus, the inner surface of the wall is seen to 

 be strongly ridged from its beginning in segment vi ; the small pro- 

 jections in segment x are distinct crypts, also ridged, and in open 

 communication with the general lumen ; in xii the ridging is longi- 

 tudinal, and more regular than in front ; in xiii the wall is very 

 vascular, but the ridgmg has ceased. 



The last heart is in segment xii. 



The excretory system is meganephric. 



Testes and funnels are free in segments x and xi. Vesiculae 

 seminales, of moderate size, are present in segments xi and xii, 

 attached to the anterior septum of the segment. 



Ovaries, funnels, and ovisacs are present in the usual 

 segments. 



The spermathecae are two pairs, small, ovoid, sessile, and 

 situated in segments x and xi at the anterior border of each ; they 

 seem to open in grooves 9/ro and lo/ii, in line with the 

 dorsal setal bundles. 



REFERENCES TO LITERATURE. 



1. Beddard, F. E., Observations upon an American Species of 



Perichaeta, and upon some other Members of the 

 Genus. Proc. Zool. Soc. Loud., 1890. 



2. ,. On some new Species of Earthworms from vari- 



ous Parts of the World. Proc. Zool. Soc. Land., 

 1892. 



3. , A monograph of the Order Oligochaeta. Ox- 



ford, 1S95. 



4. Benham, \V. B., On the Old and some New Species of Eartli- 



worms belonging to the genus Plagiochaeta. 

 Trans. New Zealand Inst., vol. XXXV, 1902 



(1903)- 



5. , , On some Edible and other New Species of Earth- 



worms from the North Island of New Zealand. 

 Proc. Zool. Soc. Lond., 1904. 



