49* 



and sixty -fire approximately half grown worras of -fohinos to ma 

 revc lut urn were found in the intestine. Upon careful study 

 the adults from both sources were founci to be the same 

 pecies* 



The half grown adults 3.80 mm. long were found to have 

 a few eggs in their uteri. 



Jt* e rhap n ih ft ran s t s i gn i f i cant t h ing abc ut th e a dul t 

 ffqhincstptaa revolutum as compared with its Oercaria, is 

 that the number of collar spines, forty-three, ie not 

 carried over in total number to the adult. The adults 



ave only Uiirty-ix or thirty -s even collar spines, in 

 those with thirty -seven oollar spines Uie last one on 



one of the sides is only about one -third the size of the 



spines 

 Others. In Wse with the th irty-iV this saall spine is 



lacking. 7>iis reduction in number frr/m the oerc?n ia to 

 the adult, i believe, can be readily explained because cf 

 Lhe- ith which any of the spinew oari be lost unless 



the ^orms are Jiandled very -t*refully and the fact that there 

 is not enough room on the collar for more spines. The spines 

 in the adult are arranged in alternate rows as in the 

 oerc-iriA, and il^o have the same olumping arrangement on the 

 ventrcil side, but the number in e<*oh clump in the adult is 

 reduced about three on a side. The size of the innermost 

 spine, the very aaaall one above mentioned excluded, is usually 

 about two thirds the length of the larger ones, which are 

 0*099 mm. in length. Since the largest spines on the collar 

 of the caroaria are onHy 0.018 mm long this means that the 

 majority <.f the collar spines have gsown about five and a half 

 times. This explains the fstot above stated th-at th^re is 



