402 GYMNOKHYNCHTJS HOEPJDUS, 



ance. They were cylindrical, very much elongated, coiled 

 and twisted on the surface and in the substance of the 

 organ, one of their extremities subglobose, and situate 

 immediately under the peritoneum, the other tapering to a 

 fine point. They adhered to the parenchyma of the organ 

 by cellular tissue, and occasionally, where one coil lay over 

 the other, the two adhered. Their colour was cream-white, so 

 that they contrasted strongly with the deep brown of the liver. 

 On removing one of them, and making a longitudinal 

 incision, I found that it was not a worm, but an elongated 

 sac or cyst containing a worm, which, when withdrawn, 

 was found to be alive, although the fish had been a week 

 dead. When placed in lukewarm water, it pushed out its 

 head and neck from the cervical receptacle, protruded the 

 four-armed tentacula, and continued in lively motion for 

 some hours. The globose receptacle, with the head and 

 neck of the worm, were lodged in the bulbous extremity of 

 the cyst, but the tail did not extend into the attenuated 

 extremity. 



I had no difficulty in referring the worm to the genus 

 Gymnorhynchus. I may remark, however, that it presented 

 one character not included in the definition of this genus. 

 It exhibited, when gently compressed between two plates 

 of glass, distant, but distinct articulations. From an 

 examination of Bremser's drawing, and a consideration of 

 the relations of the genus, I strongly suspect that the old 

 species is also articulated, and that such a conformation 

 must be considered as a character of this cestoid genus. 

 My specimens present a character which appears to be 

 sufficient to distinguish them as a new species. They have a 

 separate circle of large recurved hooks on the tentacula, an 

 arrangement not to be seen in Bremser's figure of Gymno- 

 rhynchus reptans. 



The cyst enclosing the worm is double. The outer coat is 



