52 



project out of a cup-like follicle. The egg is oval, telolecithal, and the protoplasm, 

 which forms a cap under the micropyle, extends further downward on one side 

 of the egg than on the opposite side which is somewhat flattened. The flattened 

 side of the egg becomes the posterior . the side opposite becomes the anterior , 

 surface of the embryo. 



The oviduct. (Plate II Figs. 18, 14) like the sperm duct, lies upon the left 

 side of the body. It consists of three portions , the internal oviduct , the oviducal 

 gland and the external oviduct. The first is a broad , flattened , thin w^alled and 

 slightly muscular tube which passes forward from the ciliated funnel, its internal 

 opening , to the oviducal gland , doubles upon itself in a large dorsal loop , and 

 then enters the oviducal gland obliquely from its outer side. The entire internal 

 oviduct is peristaltically contractile: its proximal portion and probably the entire 

 duct is ciliated. The three segments of the internal oviduct lie side by side and 

 partially overlap one another. 



The oviducal gland is merely a glandular enlargement of the oviduct. It is 

 large , oval , flattened , and is prolonged into the flaring external oviduct. Its large 

 vertical lenticular cavity extends nearly to the outer wall of the gland and divides 

 it somewhat obliquely into a short outer and dorsal segment and a longer inner 

 and ventral segment which is continuous with the external oviduct. The outer 

 segment is perforated near its middle by the inteinal oviduct , and the cavity of 

 the external oviduct extends forward from the middle of the inner segment. 

 The thick wall of the gland is formed of a vast number of thin curtain-like 

 septa which extend directly inward from the exterior to the lumen of the gland. 

 They form in each segment a single series which extends from the fore end of 

 the segment around the opening of the internal or external oviduct to the oppo- 

 site side of the same end of the same segment , and since the septa are nearly 

 perpendicular to the cavity of the gland and of the oviducts, they are trans- 

 versely placed ventrally and radiate from the oviducts dorsally. Each lamella is 

 covered with a columnar epithelium which secretes the mucin or pseudomucin 

 of the egg capsule and probably part of that of the egg case. The free edges 

 and probably the entire surface of the lamellae are ciliated. 



The external oviduct is a muscular tube whose distal end is obhque, flaring 

 and more or less folded. 



The nidamental glands cover the lower surface of the viscera from the base 

 of the rectum to the end of the posterior aorta. Their structure is similar to 

 that of the oviducal gland except that their lumina are longitudinal and their 

 lamellae transverse. The glands together form an elliptical flattened mass. Each 

 gland is linear except that its outer angles are quite rounded. In transverse 



