114 Dr. J. D. F. Gilchrist on the Eggs and 



part, take the form of transverse folds and lateral loops. In 

 the middle region these are confined to the space between 

 the vitelline glands, but more posteriorly they sometimes 

 extend laterally beyond the intestinal diverticula. The 

 ascending limb of the uterus passes forward between, and 

 ventrally to, the testes. The eggs are roundish-oval in 

 shape, and when fully formed have a rather thick brown 

 shell, usually showing an indentation on one side, so that in 

 profile one side is convex, the other concave. The eggs 

 measure 42'5-50 fx X 30-35 fi. 



The variety described above I propose to call 



Dicroccelium lanceatum St. & Hass., var. symmetricum, 



in allusion to the arrangement of the testes. 



This variety being at present known only from specimens 

 collected from a single host, a cat, it is doubtful whether it 

 should be regarded as a " local" variety or as a form peculiar 

 to cats. An examination of examples of D. lanceatum from 

 sheep or other herbivorous animals in the same locality would 

 be of great interest from this point of view, as well as a 

 further investigation of the parasites of cats. In any case, 

 it would appear that the older helminthologists may have 

 been correct in reckoning the cat among the hosts of 

 " Distomum lance olatum." 



EXPLANATION OF PLATE XIV. 



Dicroccdium lanceatum, var. symmetricum. Ventral view of a stained 

 specimen. C.S., cirrus-sac; Int., intestinal diverticulum; Oi\, 

 ovary ; R., receptaculum seminis ; T., left testis ; V., vitelline 

 glands: V.S., ventral sucker. 



VII. — The Eggs and Spawning-habits of the Pilot Fish 

 (Naucrates ductor). By J. 1). F. Gilchrist, M.A., 

 D.Sc., Ph.D. 



In the course of a general enquiry into the spawning- 

 habits of Cape fishes, a mature female of the pilot fish was 

 found. The eggs and larvse of about thirty Cape fishes 

 have been described in local publications, but, as the pilot 

 and its peculiar habits are so well known, and have attracted 

 attention in all parts of the world, a description of the 

 mature eggs of this fish, hitherto unrecorded, may be 

 worthy of a special note, and interest a wider circle of 

 readers, more especially as the nature of the eggs seems to 



