A NEW DICROCOELIID TREMATODE COLLECTED ON 



THE PRESIDENTIAL CRUISE 



OF 1938 



By ALLEN MclNTOSH 

 U. S. Bureau of Animal Industry 



Herein is described a new species of trematode belonging to the 

 genus Iniidwm Travassos, 191 6. This species is based on a single 

 specimen obtained by John T. Lucker from the gall bladder of a 

 "jubo" snake, Orophis (Droinicus) lioodensis. This snake was col- 

 lected on the Galapagos Islands by members of the 1938 Presidential 

 Cruise. After death of the snake in the National Zoological Park, 

 where it had been exhibited, it was referred to Dr. Doris M. Cochran, 

 Division of Herpetology, United States National Museum, for pre- 

 serving and identification. 



INFIDUM LUCKERI, n. sp. 



Description. — Body oblong, 3.31 mm. long by 1.62 mm. wide: cuti- 

 cula without spines but with what appear to be fine longitudinal ridges. 

 Oral sucker subterminal 412/* in diameter; acetabulum pre-equatorial, 

 412/* by 444/A. Pharynx 174/x in diameter; oesophagus very short; 

 intestinal crura ending at different levels in the third fourth of body. 

 Excretory pore subterminal, dorsal. Testes oval, about 200/1. by 238/x, 

 with zones partially coinciding and fields separate, situated near level 

 of posterior rim of acetabulum. Vasa efferentia uniting at base of 

 cirrus sac dorsal to acetabulum ; cirrus sac extending from near level 

 of center of acetabulum to genital pore, the later located to left of 

 median line at level of crural fork and ventral to outer margin of left 

 crural branch. Ovary oval, 174/x by 222//., median, its anterior margin 

 at level of posterior rim of acetabulum. Laurer's canal and seminal 

 receptacle present, but somewhat obscured by Mehlis' gland and vitel- 

 line reservoir which are located immediately posterior to ovary. Vitel- 

 laria extending from near level of anterior margin of acetabulum to 

 slightly beyond middle of body. Uterus extending to near posterior 

 end of body, with few coils slightly overlapping crura ventrally. Eggs 

 light yellow, 26/i by 16/t. 



Habitat. — Gall bladder of Orophis (Droinicus) lioodensis (U. S. 

 Nat. Zool. Park no. 7485). 



Smithsonian Miscellaneous Collections, vol 98, No. 16 



