629 



from the lateral trunks just anterior to the commissure, the two »rhyn- 

 chocoel vessels«, from the lateral trunks just behind the junction of 

 the oesophageal vessels. These two pairs of vessels are of short extent, 

 fusing again with the lateral trunks, respectively at, and anterior to 

 the nephridial region. The lateral vessels extend throughout the body 

 and are united in the tail region by broad commissures running dorsal 

 to the intestine. Nephridia, a single pair, anterior part consists of 

 about twenty terminal bulbs. The excretory duct runs backwards, 

 doubles on itself, runs forward and opens to exterior by a single pore. 



The inner circular muscle layer becomes very greatly thickened 

 and ends in nephridial region, just in front of the beginning of the 

 middle intestine. A thin outer longitudinal muscle layer is present 

 for a short distance in head region, it eases after the lateral nerves 

 have moved into the circular muscle. Rhynchocoel extends throughout 

 body, proboscis sheath musculature slight or absent in anterior part of 

 body. The gonads occupy usual position, between the pouches of the 

 middle intestine. The specimen found was a mature male, with the 

 spermatozoa partly discharged. It will be seen from the above descrip- 

 tion that Carinoma tremaphoros resembles C Armandi (M'Int.) Oud. in 

 many respects, but the considerable difference in the blood system, the 

 slight differences in size, in the oesophageal nerves, the nubmer of 

 terminal bulbs of the nephridia, and the greater thickness of the inner 

 circular muscle layer, and, especially, the presence of the twelve der- 

 mal sensory pits have led me to make this a new species. The sensory 

 pits are so apparent, even with a very low power, that I cannot believe 

 they could have been overlooked in the European species. 



The differences between C. tremaphoros and C. pataffonica, the 

 South American species, are in size, in the blood systems, in the ne- 

 phridia, the terminal bulbs occurring in greater numbers and projec- 

 ting farther into the wall of the blood vessel in C. patagonica, and in 

 the sensory pits of C. tremaphoros. 



In several places in the nephridium where the ducts leading to 

 the terminal bulbs had been cut obliquely, it appeared as if there were 

 an opening between the excretory duct and the blood vessel, but by 

 means of adjoining sections these ducts may be traced to their termi- 

 nal bulbs. It was no doubt such appearances as these that led Oude- 

 mans to describe the open communications between nephridium and 

 blood vessel in C. Armandi. I am able to corroborate Burger's view 

 that this does not exist. 



I would thank Dr. T. H. Montgomery, Jr., for his advice and 

 criticism of my work. 



