2 University of Michigan 



The trematodes described in this paper were collected by Dr. 

 A. S. Pearse from a cormorant {Phalacocorax vigua Vieillot), 

 killed on Lake Valencia, Venezuela, July 20, 191 8. Fifty-seven 

 specimens were scraped from the wall of the esophagus, to which 

 they were attached by means of their suckers. All these belong 

 to a single species, which appears to differ from all others described 

 in the genus Clinostomum. It is distinguished by the great extent 

 of the uterus, with corresponding genital pore, and by the position 

 of cirrus intermediate between testes, hence the specific name 

 intermedialis . 



In the field the specimens were placed in corrosive sublimate 

 solution for twenty-four hours and then transferred to 70 per cent 

 alcohol. Some months later they were stained in carmine, alum 

 cochineal, or haemotoxylin. After destaining and dehydrating, 

 they were cleared in bergamot oil and mounted. A few specimens 

 were embedded in paraffin, sectioned, and stained. For toto 

 mounts, the carmine stain was most satisfactory; haemotoxylin 

 and eosin gave the best contrast for the sectioned specimens. 



Clinostomum intermedialis, new species 



Type Specimen: Cat. No. 196, Museum of Zoology, Uni- 

 versity of Michigan; July 20, 191 8; Collector, A. S. Pearse; 

 taken from the esophagus of Phalacocorax vigua Vieillot. 



Description: Some of the largest specimens were at least twice 

 the size of the smaller indixdduals — an irregularity doubtless due to 

 degree of maturity. The average length was 7 mm. and width 

 1 .5 mm. 



Generally, the body takes a regular oblong shape and a distinct 

 neck may be present. The neck may be terete and narrow or 

 flattened ventrally, depending upon the state of contraction in the 

 body. There are no spines present, the body being entirely 

 unarmed. 



