Dr. W. Baird on new Species of Intestinal Worms. 229 



considerably more slender than the anterior extremity, which is ob- 

 tuse. The body is of a ferruginous colour, and surrounded with very 

 distinct strise ; striae strong, about half a line apart from each other. 



Length about 2\ inches. The only specimen found is a female. 



This species differs from Ascaris inflexa, to which it is nearly 

 allied, by the head being more obtuse, and the anterior extremity 

 altogether less attenuated ; the striae are very much stronger and 

 more distant from each other ; the valves of the mouth are much 

 more strongly developed and prominent. 



Hah, Found on the outside of the intestines of the Oreophasis 

 Derbianus of Guatemala. 



This rare bird formed part of the collection made in Guatemala by 

 Mr. Salvin. I have, accordingly, dedicated this species of Ascaris 

 to him. 



2. Ascaris obconica. 



Head naked ; valves of the mouth small but projecting. Body 

 of male slender for three-fourths of its length, then rapidly beco- 

 ming thicker till within a line or two of the extremity, which is 

 blunt, straight, or only slightly inflexed, and terminating in a little 

 papilla. The skin is strongly striated. Male spicula within half a 

 line of posterior extremity. Colour of body slightly yellow, or light 

 straw. 



Length (male, largest specimen) 2 inches. 



Hab. Intestines of a Freshwater Snake, Uranops angulatus, from 

 Brazil. For this species I am indebted to Mr. Edward Gerrard of 

 the British Museum. 



3. Ascaris Boddaertii. 



Head naked ; valves of mouth distinct, large, somewhat triangular 

 in shape. Body narrower at the anterior extremity, thicker towards 

 the centre, and becoming narrower again at posterior extremity. 

 Skin slightly striated ; strise rather distant. Lines on the two sides 

 of the body very distinct. Anus nearly terminal. Colour yellowish, 

 or a deep straw-colour. 



Length of body (a female) 4 inches. 



Hab. Intestines of Herpetodryas Boddaertii, a snake from the 

 West Indies. For this species I am indebted to Dr. A. Giinther. 



4. GORDIUS FULGXJR. 



Among the various objects brought to this country and collected 

 by Mr. R. Wallace, was a species of Gordius, of which he gives the 

 following account : — " This curious Annelid is found on the ground 

 in the forests of Batchian, twisted among dead leaves or twigs. It 

 glides slowly, has no perceptible head or mouth, but resembles 

 exactly a smooth circular thread of india-rubber, the thickness of a 

 verv fine violin-string. It is called by the natives ' Ular langit,' 

 (^li(/htniny-snake^ ." 



One of the specimens measured 4i| inches in length ; a second 



