THE LEECHES (mRUDIXEA) 



655 



30 (29) Complete somites of six unequal annuli; salivary glands difluse- 



gastric ceca seven pairs; caudal sucker wiih marginal circle' 

 of glands and papillae; eyes one pair, united; size small 

 Probably fish parasites. . ActinobdellaMvvTi: u)Oi . . 31 



31 (32) Sucker papillae and glands about 60; five series of dorsal i)apillae. 



Actinohdrllti anucclens Moore i<;oi. 



32 (31) Sucker papillae and glands about 30; median dcjrsal series of t)a- 

 pillae alone developed. 



Actinobddla inajuiannuluta Moore i.^Os. 



Fig. iooi. Actinohdclla inequian- 

 nulata. Annulation, s^-nsilUc 

 and (lursal cutaneous ^lapilUc of 

 anterior twelve Mimites. Pov 

 terior en(l with sucker from the 

 side. X 20. (After Moore.) 



33 (2) Body divided into a narrow anterior and a wider posterior region; 



little depressed; eyes when present usually well separated; 

 stomach usually with only a posterior pair of more or less 

 coalesced ceca. . . , Family Ichthyobdellidak . . 34 



34 (35) Complete somites of 12-14 very short annuli; no distinct lateral 



vesicles; eyes one or two pairs; size small. Parasitic on 

 small fishes Piscicola punctatii iW'TnU) iS-ji. 



35 (34) Complete somites of six annuli; strongly divided into two regions; 

 lateral pulsating vesicles in somites XII to XXIII; eyes 

 two pairs; size medium. Parasitic on Fundulus in fresh and 

 saltwater Trachclobdelld viviJa {\crTill) iS-j 2. 



The anterior region is formed of eleven somites of which the first 

 five comprise the head and the last three the clitellum. which is 

 somewhat sunken into the widened jxisterior rcRioii. .X little known 

 leech which has been taken only in southern New Kn^land. 



Fig. 1002. Trachelobdellavivida. Annulation from dorsum. Somites al the 

 ends of the body are numbered and the annuli l)et\vecn which the male 

 and female orifices lie are indicated. X j. (After M.x.n- > 



