70 B. GEASSI AND A. SANDIAS. 



dilated posteriorly to form a vesicula seminalis ; it then be- 

 comes narrowed again, and opens finally behind into a common 

 ejaculatory duct. Just before the origin of this duct each vas 

 receives the discharge of two glandular sacs, which sometimes 

 contain a transparent secretion, and at other times semen.^ 

 The male genital opening is evidently situated in the larva at 

 the hinder part of the ninth sternite. In the adult it is less 

 distinct, as the penis is developed beyond that point by a direct 

 prolongation of the ejaculatory duct, the external meatus of 

 which corresponds nearly with its apex. 



The spermatozoa, like those of most insects, possess a 

 readily distinguishable head and an elongate tail. 



[The internal anatomy of Embia urichi, with the omis- 

 sion of the frontal ganglia, the structure of the testes, and the 

 histological features, which the translator has not investigated, 

 corresponds precisely with Professor Grassi^s description, ex- 

 cept in the following points. The stomato-gastric nerve ends 

 exactly as in Blattidse in a triangular ganglion at the back of 

 the proventriculus, from w^hich two nerves pass obliquely back- 

 wards under the invagination between it and the chylific 

 ventricle (no other ganglia are evident along the course of the 

 oesophagus). The arrangement of the abdominal nerve-cord 

 is identical. The chylific ventricle is relatively much larger 

 than in Professor Grassi's figure, and extends from about the 

 mesothorax to the eighth abdominal segment. At its anterior 

 extremity on the dorsal aspect there is a short rudimentary 

 pouch, which projects forward over the deeply invaginated 

 portion of the proventriculus, and looks like an imperfectly 

 developed csecum. The Malpighian tubules vary in number 

 from about twenty to twenty-six. 



The ovaries are identical in structure ; they become very 

 large in the fertile female, and their arrangement cannot then 

 be made out, as the tubes become coiled in a complex manner, 

 and may extend even up to the prothorax, from which ripe 

 ova have been extracted. As many as twenty-six ripe eggs of 

 equal size have been found in the same female. They are oval^ 

 1 The nature of their conteuts requires further investigation. 



