2IO RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



While it cannot be admitted that the worm belonged to the cucum- 

 ber, nor is it clear how it reached this position, it is a question as to 

 the species. It bears a near resemblance to the Tceiiia crassicollis of the 

 Cat, but is not more than half the size of this as it ordinaril}- occurs. 



In comparison with a complete specimen of the latter, six inches 

 in length in the contracted condition as preserved in alcohol, we find 

 the following measurements : 



cii^^b^r. T. crassicollis. 

 mm. mm. 



Breadth of head 875 1-875 



Breadth of crown of hooks .625 i . 



Breadth of neck .8 i 25 



Breadth of middle segments 3.5 6 to 8 



Length of middle segments 1.66 i. 



Breadth of terminal segments 2.5 3.5 



Length of terminal segments 4. 5. 



[March, 1888.] 



Habit of Cirolana conchariini. — Prof. Leid}' said that he j^esterday 

 went to Atlantic City, in the expectation of finding interesting speci- 

 mens cast a.shore in the recent storm, but there proved to be nothing. 

 He picked up a few recently dead Lady-crabs, Platyoniclms oce/Iafus, 

 and found in them a number of the Cirolana concha^'um, feasting 

 upon the flesh and other parts, as he had previously noticed them 

 feeding on the edible crab. (See page 80, Proceedings 1888. ) From 

 these observations it would appear to be the usual habit of the 

 Cirolana to prey on dead crabs and probably other animals. 



[March. 1888. No. 556. See Bibliography.] 



Parasites of the Striped Bass. — Prof. Leidy exhibited numerous 

 specimens of a minute cru.stacean parasite from the gills of the Striped 

 Bass or Rockfish {Labrax lineatus'), brought to our market. He 

 said it is a common parasite and he had been familiar with it since 

 1871. It was described bj^ the Danish naturalist, Dr. Henrik Kroyer, 

 under the name of Ergasilus labricis, obtained from the same fish at 

 Baltimore (Danske Naturh. Tids., i863-'64, 303, Tab. ix, Fig. 2). 

 Common as it seems to be, Mr. R. Rathbun, in his published list of the 

 parasitic Copepoda from American waters, says he had not observed 

 it (Proc. U. S. Nat. Mus. , 1884, 483). The little crustacean lives 

 suspended on the outer surfaces of the gills, where it is conspicuous 

 from the white color of its thorax and egg-pouches on the red color of 

 the gills. The length of the parasite together with its egg-pouches 

 is 2.125 nim. ; without the latter 1.25 mm. 



