ASCARIS BICOLOK. 



141 



going on in the neighborhood and within. A third nicer, of an elliptical form, 2| inches long, and 

 with more regular edges than the preceding, had been eaten away on the anterior wall, close to the 

 lesser curvature of the stomach and between 5 and 6 inches from the pylorus. Between the second 

 and third erosions here described, but on the posterior wall of the stomach, another very extensive 

 patch of ulceration had taken place. This ulcer stretched between the greater and lesser curvatures. 

 It had a semilunar figure, was rather more than 4 inches long, possessed irregular borders and 

 varied from one-half to 1 inch in width. The mucous coat around had been undermined in a manner simi- 

 lar to that described above as occurring in the second ulcer. To the right and lying parallel with 

 this large excavation were a series of small circular and ovoid spots, which had been eroded in like 

 manner with those already described. The spots just spoken of varied in size from about a three- 

 penny piece to a shilling, and they evidently were fast running into one single, long ulcer, resembling 

 that upon the left side. Only a very few worms were found here and there in the intestinal tract ; 

 some were observed to have passed previously to the horse fat having been given. 



Dr. Baird, of the British Museum, having examined some of the entozoa, considers them new to 

 science, and sufiflciently different to require a now speciiio name. He proposed therefore, that of 

 Ascaris iicolor, on account of a peculiarity common to most of [p. 70] them, viz, that the posterior 

 half of the body is more or less of a reddish or pinkish hue, the remaining segment being pale colored. 

 I myself incline to the opinion that this colpration may not be of a specific kind, but due in some 

 measure to the intensely congested condition of the stomach and sanguineous nature of the food. 

 The accompanying figures I have had drawn under my supervision ; and Dr. Baird is pleased to 

 consider them a faithful delineation. 



ASCARIS BICOLOR, Baird. 



Fig. 52. 



rig. 54. 



Hg. 53. 



Fig. 55. ' Fig. 56. 



[Figs. 52-54.] Three female specimens, of about the natural size ; 



Fis. 67. 



A. [Figs. 52-54.] Three female specimens, of about the natural size ; that to the left shows the 

 manner in which occasionally the caudal end is found coiled up. 



B. [Pig. 55.] Portionnearthemiddleof the body, enlarged so as to display the transverse striations 

 and how some of them interdigitate. 



C. [Fig. 56.] Magnified view of the head and labia. 



