7iew Sj>fcies of Eurthioonns. 53 



Twelve species are now known, of wliicli six occur in 

 India. Found in close proximity of fresh water. 



The Indian e.\am|)lcs may be recognized on the basis of 

 the foUowing characters: — 



1. Clitelhim seguienta 17, 18-36, 41 ; latero- 



ventral ridge or wing-segments 27, 29- 

 32, 33 ; puberty-tubercles three rows in 

 front of the ridge ; gizzard segment 8, 

 slightly extending into 7 G. aimandaki, Mich. 



2. Clitellum segments 14, lo, 16-28, 30 ; 



latero-ventral ridge segments 20-23, 24; 

 the ridge may be foliated into a cauliflower- 

 like outgrowth ; puberty-tubercles in three 

 sets, an anterior on segments 10- 12, a middle 

 on 17, 18-19, and a posterior on 24-28; 

 gizzard segment 7 extending into 8 .... G. tuberosus, Steph. 



3. Clitellum segments 13, 14-38 ; latero-ventral 



ridge segment 25-32, 32^ ; puberty- 

 tubercles three rows in front of ridge ; 

 gizzard segment 8 extending into anterior 

 half of segment 9 G.Jluvialilis, Rao. 



4. Clitellum segments 14-35, 43 ; latero- 



ventral ridge segments 24-32, 36, and may 

 be occasionally repeated on segments 40-45 

 on one or both sides ; puberty-tubercles 

 three or only two rows in front of ridge ; 

 gizzard segment 8 G. elegam, Rao. 



5. No clitellum ; no puberty-tubercles ; no 



latero-ventral ridge, or a feebly-marked 

 one between seta-line be ; segment on tlie 

 middle of body as large as or larger than 

 segments 7-12 ; gizzard spherical, seg- 

 ment 8 ; no oesophageal pouches G. rarm, Rao. 



G. No clitellum ; no puberty-tubercles, no 

 latero-ventral ridge ; segments on the 

 middle of body considerably less than half 

 the width of segments 7-12 ; gizzard 

 cylindrical in segments ~\-^\ ; oesophageal 

 pouches in segments 9-10 G. saffronensis, Rao. 



Glyphidrihis fluviatilis, pp. n. 



There are more than forty large and sexually matnre 

 specimens in the collection, with the median row of puberty- 

 tubercles ranging from 3 to 14, and their mode of occur- 

 rence is very arbitrary. 



External characters. — The longest specimens measure 

 270-275 mm. ; circumference in the preclitellar region 

 4 J mm. ; width in the region of puberty-tubercles 5^ mm.; 

 across the clitellar wing 1 mm.; postclitellar region 4 mm. 



The anterior part of the body down to segment 16, 18 is 

 round, and behind it is four-cornered ; the terminal part 

 of the body may be swollen or narrowed into a cone. The 



