Introduction to Animal Morphology. 181 



from the body wall, to which it may be suspended by 

 mesenteric strings. Little spines sometimes arm its 

 oral end, even in embryos (Enoplus and Anguillula). 

 In Ascaris megalocephalus there is a gland in the 

 <esophagus opening outwardly. In Cheiracanthus 

 aculeatus, of the tiger, four caeca! (salivary ?) glands 



n into the mouth ; while a lining of gland-cells in 

 the oesophagus is not uncommon. In some, the 

 <x?sophagus acts as a sucking tube, and is divided into 

 a glandular and a suctorial part. The so-called 

 -tomach is distinct, muscular, often globular, some- 

 times with a chitinous, gizzard-like lining, and may 

 be suctorial, the true stomach then being the dilated 

 end of the straight intestine, into which this gizzard 

 opens by a narrow pylorus. The intestine has a 

 glandular lining, a muscular coat (for its lower third 

 only in some), and it is held in its place by thick, in- 

 terrupted, cellular mesenteries, the appendices nour- 

 ricieres of Cloquct. The anus is ventral, longitudinal, 

 .letimes sub-terminal or terminal (Trichina, Tricho- 



halus), absent only in one family ; glandular caeca 

 often occur in the course of the intestine. Anguillula 

 appendiculata has one from the intestine, Asc. hali- 

 coris from the stomach. The body cavity contains a 



.visceral fluid (blood r), in which a few oval and 

 amoeboid corpuscles float. A water-vascular canal 



in each of the thick lateral lines of the derm is ; 

 tli< i by a common medio-abdominal pore, 



illy at tin; level of the muscular stomach. They 

 bran< bed in Strongylusauricularjis, 

 and fbnniag a ribbon-like lateral on^min Mlaria. The 

 four circum-anal c^cca in As< aris dac tyluris, which 

 open by narrow ducts within the anus, may be excre- 

 tory org, iblv n-nal. 



