2 University of Michigan 



Carophyllaeus laruei, new species 



Type Specimen: Cat. No. 197, Museum of Zoology, University 

 of Michigan; taken from Catostomus commersonii Forster, Lake 

 Mendota, Wisconsin, August 22, 1919; M. E. Lamont, Collector. 



Description: The body is oblong-ovate, flattened dorsoven- 

 trally, and measures 7 mm. by .8 mm. The anterior end is 

 unarmed, has a poorly developed adhesive organ irnperfectly set 

 off as a scolex from the rest of the body. This primitive scolex 

 has four poorly defined suckers with an obscure terminal disk at 

 the anterior end. The body is not divided into proglottids. 

 There is no trace of a digestive system. 



The general arrangement of the reproductive system resembles 

 that of other Carophyllaeids ; there being no duplication of geni- 

 talia, merely a single set of organs. Aside from the poorly 

 developed suckers, the anterior fifth of the body is without special 

 organs. Three-fifths of the body length is occupied by small 

 testes arranged in about two rows along the median line between 

 the lateral vitelline glands. The vitelline glands extend in a 

 single row along each side of the middle of the body to within 

 about a fifth of the length from each end. They are elongated, 

 oval in form and are readily distinguished from the testes, which 

 are irregular and som.ewhat lobate. 



In the posterior fifth of the body are found the cirrus, uterus, 

 and ovary. The vas deferens leading from the testes appears 

 just posterior to the area occupied by the testes. It coils upon 

 itself several times and ends in a well-developed cirrus. The ovary 

 is posterior to the testes; it is a lobate organ having the form 

 of a capital H- The uterus coils between the arms of the ovary, 

 extends nearly to the posterior end of the body, then anteriorly 

 to the genital pore which is immediately posterior to the cirrus. 



This species is similar to Carophyllaeus mutabilis Rudolphi. 

 In Carophyllaeus mutabilis, however, the vitelline glands and 



