Winchester s paper is an excellent piece of work, giving excellent 
illustrations of S. vulgaris eight years before Looss in Egypt definitely 
separated out and named this species. It shows what good work the 
practicing veterinarian can do along investigational lines when he has 
the time, the inclination and the taste for painstaking work. 
Fig. 45. Dictyocaulus arnfieldi. Larvae, the one at the left in the process of leaving 
the egg shell, x 150. From Railliet, 1893. 
The eggs of the other strongyles of the large intestine of the horse 
are probably similar in a general way to those of S. vulgaris in 
appearance. The egg dimensions which have been published are as 
follows: Cylicostomum euproctum, 80 to 100 microns long by 50 to 60 
microns wide; C. insigne, 75 to 86 microns long by 45 to 50 microns 
wide; C. goldi, 100 microns long by 50 microns wide; CEsophagodontus 
robustus, 100 to 130 microns long by 50 to 60 microns wide; Triodonto- 
phorus minor, 87 microns long, according to some writers, or 80 to 
90 microns long by 40 to 50 microns wide, according to Boulenger; 
Tr. serratus, 130 microns long; Tr. intermedius, 90 to 100 microns long 
by 40 to 50 microns wide; Tr. tenuicollis, stated as similar to those 
of Tr. intermedius; Tr. brevicollis, 90 to 100 microns long; Acheilos- 
toma paranecator, 63 to 64 microns long by 43 microns wide. The egg 
47 
