304 W. T. PROUT 



dually to a trumpet-shaped inner end. It lias a well detined double 

 outline and a central canal, which lias a minute opening at the free 

 end. The latter is 6 a in diameter, and the trumpet-shaped end 

 14 [j.. Length 82 [j.. Beginning just within the orifice is another 

 spicule, which is much longer, 177 jj and has much the same 

 shape, though narrower at the point 4 a. Both spicules are incur- 

 vated following the curvature of the tail, and show signs ot striation, 

 the larger more markedly so. 



Female worm. — The female is longer and thickei'. The total 

 length of the head, tail, and intermediate fragments is 40, 4^^, or 

 about 16 inches. 



The head is rounded and blunt (tig. 3, A). The tail is blunt antl 

 slightly curved (fig. 3, B), but is not incurvated like the maie tail. 



The diameter close to the end is 



81J.4, rapidly increasing to 36 [i. at 



which it remains throughout the 



greater part of the Worm, tapering 



more gradually to the head whej-e 



it measures 4 [j.. The body is stria- 



ted from end to end, but not so 



tx^*^^ -^- " markedly as in the maie Worm. 



A B and has a well defmed white chiti- 



p. o K u A t tu t 1. nous cuticle. The alimentary canal 



Fig. 3. — A, head of the temale ; -^ 



B, tail of the same. is straight, but I was unable to 



make out the opening of the anus. 



At a distance of 433°°^ from the tail, the double utérus, which 

 has throughout a well defined externat lining membrane, can be 

 observed commencing in a sacculated extremity. It is hère seen to 

 be filled with a number of small fmely granular cells, somewhat 

 elongated and arranged like columnar epithelium, the base against 

 the walls, the narrow end towards the lumen of the utérus. A little 

 further on, they increase in size, are pear-shaped, and measure 

 SiJ.2 by 12 a. At a distance of 14<^m |pom the tail signs of difïeren- 

 tation are tirst to be seen. They now measure from 24 a by 12 [j. to 

 32 a by 22 a. A distinct cell wall can now be made out. 



Still further up, the protoplasm has shrunk from the cell wall 

 and difïerentiation is more marked. Size 36 a by 28 p.. The cells by 

 this tlme hâve lost their pear shape and are more or less rounded. 



