72 



developed as to form several coils (rif;.29) which cause 

 the intestine in this region to be greatly enlarp;ed (fig. 

 10). The intestine of X.finbriata is very much shorter 

 than in other "Ship-worms". The shortening of the intes- 

 tine is doubtless connected with the greatly increased ab- 

 sorbent surface of the coiled typhlosole. In most "Ship- 

 worms " the intestine forms several coils before it passes 

 around the caeci:un and in such forms there is no ^reatly 

 coiled typhlosole. 



In Teredo, as in Pholas , tr.ere is a second small, 

 quill-shaped caecum of the stomach on the dorsal side to 

 the left, under the posterior adductor (Ce. figs. V,10, 

 28). It is lined by columnar, ciliated cells and general- 

 ly contains particles of sand. It is small and seems de- 

 generate, but it may have some function at thepresent 

 time. Pelsenoer has observed an apparently homologous 

 structure in Ilucula, v/here it is said to secrete a small 

 style. 



The sheath of the crystalline style, present on the 

 midline of the larva, comes to open from the left side of 

 the stomach near the anterior end of the latter (n.S, figs. 

 7,10), and hangs towards the right side. Its blind end 



