528 G. P. PI AN A E P. STAZZI 



each supported by four simple ribs. The tail ofthe female terminâtes 

 in a rather long sharp point, which is oblique in position to the 

 body, owing to a sort of tubercle about half a line from its extre- 

 mity, under which is situated the anus. This aperture is very dis- 

 tinctly seen immediately underneath the tubercle; and the vulva, 

 which is not very conspicuous, and is in the form of a narrow slit 

 across the body, is situated immediately above the tubercle. The 

 œsophagus is rather long, and terminâtes in a lobed stomach which 

 extends for a short distance and then ends in a straight intestinal 

 canal running through the whole length of the animal. The utérus 

 is peculiar in form, and présents a very pretty appearance under 

 the microscope; it is two-branched, and has during its length 

 several expansions or swellings foUowed by contractions. The 

 ovaries are very long and twisted round the intestine. 



SCLEROSTOMUM SIPUNCULIFORME Baird. 



Cobbold, loco citato, p. 226. 



Body smooth, with extremely fine transverse striae, sipunculi- 

 form, thickset. Head distinct, separated from the body by a distinct 

 neck or constriction. Moiith circular, armed with numerous upright 

 denticles arranged in two rows, with four larger teeth, one on 

 either side, and one in front and behind, springing from between 

 the denticle-rings. Bursa longer than broad, apparently supporting 

 twenty rays, the anterior ray being double, the posterior ray qua- 

 druple, its innermost division supporting two rudimentary bran- 

 ches of unequal size : posterior latéral ray short. Spicules equal, 

 long, straight, and narrow. Tail of the female obliquely truncate, 

 the extremity conical and suddenly turned backwards. Repro- 

 ductive outlet immediately above a projencting lobe or tubercle in 

 front of the tail. Anus situated in a deep hollow at the base of cone- 

 shaped end of the tail. 



Length of maie nearly 1 inch (11 Unes). 

 Length of female above 1 inch (14 lines). 



Hab. — Intestines of Elephas indiens. 



ScLEROSTOMUM EPisTOMUM Piana. 



Corpus cylindricum, rectum, retrorsuni attenuatum, subnigrum; 

 cuticula tenuissime transverseque striata. Anterior corporis extre- 



