Aur. 21. PARASITES OF SHARKS AND SKATES LINTON. 69 



goosefish; much degenerate tissue with the larger cysts; scoleces 

 from the larger cysts were no larger than those from the smaller; 

 larvae from some of the larger cysts had degenerated. On 6 dates 

 in August. Kecord for August 3, 1910 : Many cysts in wall of in- 

 testine and on mesentery of 1 goosefish. One unusually large 

 cyst was irregularly oval and pedicelled, with blotches of dark 

 pigment, and ivory-white material showing through the walls of 

 the cyst; dimensions, 22 by 15 by 8 mm. When this cyst was 

 opened it was found to be filled, with the exception of the small 

 space occupied by the plerocercus, with white, cheesy material, in 

 which there were calcified masses and some dark-brown, waxy de- 

 generate tissue. The plerocercus was subglobular, 7 by 5 mm., with 

 thin wall and clear fluid contents, except at one end where there 

 was a small ivory-white spot, the scolex. This plerocercus did not 

 differ either in appearance or size from many which were enclosed 

 in the wall of the intestine. Many cysts were found in the intesti- 

 nal wall which were completely calcified; when opened they liber- 

 ated a solid calcified mass, resembling a grain of rice, about 4 by 2 

 mm. The scolex from the large cyst had the following dimensions : 

 Length 4.2; breadth of head 0.70, of neck just behind head 0.35, 

 at bulbs 0.72. On 1 date in September, cysts on viscera. On 6 

 dates in October, cysts on viscera as usual. On 4 dates in November. 

 Record for November 12, 1909 : 10 pyrif orm and subglobular cysts 

 from 3 goosefish ; smallest cyst about 9 by 6 mm., largest 22 by 11 

 by 8 mm., with a large amount of dark-brown degenerate tissue; 

 smallest cyst translucent, larger cysts with increasing amount of 

 degenerate tissue ; scoleces typical. It is to be understood that the 

 number of cysts collected by Mr. Edwards does not necessarily rep- 

 resent all the cysts seen. On 1 date in December, 1 cyst in vial; 

 record shows that 3 fish were examined. 

 1923, August 17 : Many encysted on viscera. 



Lophopsetta Tnaculata. 



Collections made in 7 of the yeai-s from 1903 to 1910, inclusive: 

 Cysts, usually pyriform, on viscera, or embedded in the intestinal 

 wall, in many cases in clusters in wall of rectum. For example, on 

 August 20, 1910, 27 sand dabs were examined; cysts were found in 

 the'lntei-stinal wall of nearly all of them; five or six of the fish had 

 each a cluster of from 10 to 20 cysts in a space of from 20 to 30 mm. 

 in length; the cysts were most common in the wall of the rectum. 

 On 3 dates in July, 1 to 18 cysts on each date, 3 fish examined; 7 

 dates in August, 9 to many cysts on each date, 36 fish examined; 1 

 date in September, 14 cysts, 1 fish examined; 2 dates in October, 5 to 

 many cysts, 2 fish examined ; 1 date in November, few cysts on each 

 date, 3 fish examined. 



