447 
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 ; striz 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 boddaértii, a snake from the 
West Indies. For this species I am indebted to Dr. A, Giinther. 
4, GORDIUS FULGUR. 
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 dnnelid 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 
very fine violin-string. It is called by the natives ‘ Ular langit,’ 
(lightning-snake).” 
One of the specimens measured 41} inches in length ; a second 
5424 inches. After being immersed for some time in spirits (the 
specimens arrived dry and twisted round a piece of stick), they pre- 
sent the appearance of a twisted piece of copper wire, indistinctly 
striated across, and with a dark streak running down the centre 
throughout its whole length. This Gordius feels to the touch ex- 
ceedingly slippery, like a piece of recent sea-weed. It is slightly 
more attenuated at the anterior than the posterior extremity. In all 
probability it is of a cylindrical form like other Gordii; but, owing 
to the way in which it was sent to this country, it is at present of a 
rather flattened form. 
I have named it Gordius fulgur from its native name of Lightning 
Snake. 
Hab. Forests of Batchian ; probably a native, in its immature state, 
of some large insect. 
