90 THE ZOOLOGIST. 



3. One pair of oesophageal glands in segment 8 — 



a. Two pairs of septal glands . . . -H". f rider icioides. 

 (3. Three pairs of septal glands — 



* Dorsal vessel arises in 8 . . . H. pttsilla. 

 ** Dorsal vessel arises in 8-9 — 



(1) Sperm-funnel about 2 x 1 . H.fragilis. 



(2) Sperm-funnel about 4x1 . H. hibemica. 

 .*** Dorsal vessel postclitellian . . H. triloba. 



y. Four pairs of septal glands . . . H. qiiadrupla. 



As it is a great convenience to the student to have these 

 facts presented in various ways, I append a numerical key 

 as well : — 



1 ( (Esophageal glands absent (Henleanella) 2 



((Esophageal glands present (Henlea) 15 



(" Two pairs of septal glands H. mariona. 



2- Three pairs of septal glands 3 



( Four pairs of septa 1 glands H. trisetosa. 



o | Setae not exceeding five per set 4 



( Setae exceeding five per set 8 



. ( Dorsal vessel clitellian 5 



[ Dorsal vessel anteclitellian 7 



t- ( Salivary glands absent H. marina. 



{ Salivary glands present 6 



n f Normal in type and position H. curiosa. 



' i Abnormal in type and position H. alba. 



„ (Sperm-funnel spindle-shaped H. tcnella. 



{ Sperm-funnel pear-shaped H. lampas. 



n ( Two pairs of spermathecae H. putcana. 



\ One pair of spermathecae 9 



q | Duct of nephridia from posterior 10 



{ Duct of nephridia from anterior 11 



, q ( Salivaries present H. rosai. 



\ Salivaries absent H. parva. 



, , f Salivaries present 12 



( Salivaries absent 13 



| Slender or forked H. multisirinosa. 



Sac-like in segment 4-5 H. mimUa. 



Unusual form of gland H. inusitata. 



Normal type of salivary H. dicksoni. 



| Dorsal vessel arises in 7-8 H. glandulosa. 



] Dorsal vessel arises in 8-9 H. arenicola. 



1 Dorsal vessel arises in 9 14 



{ Dorsal vessel arises in 10-1 1 H. minima. 



1 , c Length of the type 2-3 mm H. perpusilla. 



\ Length of the type 7-8 mm H. rhatica. 



12 



13 



