Crossophorus collaris, Hemprich & Ehreriberg. 347 



represented in fig. 1. Their projecting portions are slightly 

 bifid. The fimbriae on the inner surfaces of the lips are of 

 quite a different shape, being- drawn out to a much greater 

 length, and branching dichotomously, so that their free ante- 

 rior ends form a series of little points or teeth. In addition 

 to these, each lip also bears, near the outer edges of its inner 

 aspect, seven or eight groups or " combs " of pointed teeth 

 (fig. 1, C), forming an interrupted dentigerous ridge. The 

 number of teeth in each group varies from two to seven or 

 eight, without any appearance of symmetry. 



The cuticle of the body is marked by transverse striations 

 from 6 fju to 7 yu, apart. 



The oesophagus (fig. 3, Oes.) is very long and slender, 

 measuring 15—20 mm. in length, and ends in a bulbous 

 expansion posteriorly. This is merely a muscular enlarge- 

 ment of similar structure to the rest of the oesophagus, and 

 not a specialized glandular swelling. Immediately behind 

 this two very long anteriorly directed caeca (fig. 3, C, C.) 

 spring from the intestine. They have slightly swollen ends, 

 and in a large specimen measure about 15 mm. in length. 

 The anterior portion of the oesophagus, extending to a distance 

 of 0'5-0*6 mm. from the anterior extremity, is specialized to 

 form a gizzard, containing an elaborate chitinous apparatus. 

 This consists of a chitinous lining within the muscular wall, 

 strengthened by three wing-like processes (fig. 1, Ch.) of 

 chitin embedded in the muscles, and produced internally into 

 three serrated triangular teeth (fig. 1, T.) which meet in the 

 middle of the lumen. The wing-like processes are continued 

 posteriorly as three long narrow strips of chitin (fig. 1, Ch.') 

 embedded in the thickness of the muscular wall, and connected 

 near their origin by a transverse ring of chitin. The nerve- 

 ring crosses the oesophagus at 0'9-lT mm. from the anterior 

 end. 



In the male the posterior end is curled towards the ventral 

 side. The tail is very blunt and measures only 0"32 mm. in 

 length. There are two equal spicules (fig. 4, #.), and not a 

 single spicule as stated in the earlier descriptions. They 

 measure 1*5 mm. in a straight line from base to tip, have a 

 tubular mid-rib and broad alse, and are of a granular and 

 transversely striated appearance. There is also an accessory 

 piece (fig. 4, A.P.) 0*32 mm. in length. The caudal 

 papillae are arranged, behind and for some little distance 

 in front of the anus, in two parallel rows on either side. 

 There are on either side nine posfanal papillse in each row. 

 In front of the anus the inner or more ventral row contains a 

 continuous series of about forty papillae at regular intervals ; 



