1851.] 285 



1. Streptostoma agile, Leidy: Proc. A. N. S, iv, 230. 



2. Streptostoma gracile, Leidy: Proc. A. N. S. v, 100. 



Oxyuris Diesingii, Hammer schmidt.- Isis von Oken, 1838, 354, Taf. iv, 

 fig. vi. 



Oxyuris Blattae ox\&v\Xz\\^, Hammer schmidi: Naturwis. Abhandl. von Haid- 

 inger i,284, Tab. x, Figs. 4, 7, 1315. 



2. Suh-genus. THELASTOMA, Leidy. Pr. A. N. S. iv, 231. 



Characteribus reformatis. Annuli few in number, broad. Oral annulus 

 papillaform. Mouth small, circular; buccal organ long, cylindrical; gizzard 

 pyriform. Tail spiculate, moderately long. 



1. Thelastoma attenuatum, Leidy: Proc. A. N. S., iv, 231. 



2. Thelastoma appendiculatum:, Leidy: Proc. A. N. S., v, 101. 



Oxyuris Blattae orientalis. Hammer schmidt.- Naturw. Abhandl. von Haidinger 

 i, 284, Tab. x, Figs. 1012, ( J 8, 9, 20 ?) 



3. Thelastoma labiatum, Leidy: Pr. A. N. S. v, 101. 



4. Thelastoma robustum, Leidy: lb. v, 101. 



5. Thelastoma brevicatjdatum, Leidy: lb. v, 208. 



The larva of a lamellicorn insect, from which this species was obtained, Dr. 

 J. L. Le Conte informs me, belongs to Scarabeus relictus. 



6. Thelastoma gracile, Leidy. 



Oxyuris gracilis, Hammer schmidt: Naturw. Abh. v. Haidinger i, 287, Tab. 

 X, Figs. 2125. 



7. Thelastoma dilatatum, Leidy. 



Oxyuris dilatata. Hammer schmidt: lb. i, 287, Tab. x, 26, 27. 



8. Thelastoma laticolle, Leidy. 



Oxyuris laticoUis, Hammerschmidt; lb. i, 288, Tab. x, 28 34. 



LUMBRICULUS, Gruby. 



Acestus, Leidy: Pr. A. N. S. v, 226. 



Characterihits reformatis. Body filiform, cylindroid, hyaline. Podal spines 

 in 4 rows, in fasciculi of 2 to 5, furcate. Upper lip simple, conoidal. Girdle 

 none. Eyes none. Blood bright red. 



1, LrMBRiCTJLus spiralis, Leidy. 



Acestus spiralis, Leidy: Pr. A. N. S. v, 226. Description from the young ; 

 found in the spring of the year. 



Adult. Body very long and delicate, filiform, cylindrical; posteriorly 

 obtusely rounded. Upper lip compressed, conoidal. Annuli over 200. Podal 

 spines in 4 rows, 3 to 5 anteriorly 2 to 3 posteriorly in each fasciculus, long 

 sigmoid, furcate. Intervals of the viscera distended with globular corpuscles, 

 which, shining through the translucent integument, give the annuli a deep green- 

 ish or bluish white opalescent appearance. 



Length from 1 to 3 inches; breadth from l-8th to l-5th line. One of three 

 inches in length had 276 annuli. 



37 



.*Jt 



