but in that of the Cape forming three nodules. On the front 

 margin of the upper side are two very prominent bosses, one 

 of which in the Cape specimen has a subsidiary nodule at its 

 base. On the hind margin of this same side are two much 

 smaller bosses, much closer together. Between the front 

 points there is a shallow quadrilobate process, and just below 

 this projects the minute mouth, consisting presumably of 

 upper and lower lips and rudimentary mandibles. Of 

 anything like antennae I see no trace either in Thomson's 

 figure or in the Cape specimen. 



From the middle of the under side of the great 

 cephalothoracic expansion starts the smooth narrow chitinous 

 "neck," which has a smaller relative length than in 

 Sphyrion hmpi, but which cannot perhaps be depended upon 

 as affording a specific character by its dimensions, there being 

 in my opinion reason to suppose that it varies with the age 

 and size of the specimen, becoming relatively smaller as the 

 specimen grows larger. 



In Quoy and Gaimard's figure this section of the animal is 

 very elongate, but very short in the figure given by Guerin- 

 Meneville. 



The genital segment, which also has a firm smooth 

 integument, is broader than long, and longer that thick. 

 The upper and lateral margins are curved, the hinder is 

 almost straight, with a slight median projection, explained 

 as the rudimentary tail part. On either side of the latter are 

 bunches of vesicles, which in the Cape specimen together 

 exceed the size of the genital segment itself. The ovisacs 

 are long and narrow, containing several rows of minute eggs. 

 The Cape specimen is rather less than two inches long, 

 47 mm., the head 30 mm. wide. Thomson's New Zealand 

 specimen " taken from the abdomen of a ling (Genypterus 

 blacodesy^ was about 70 mm. long, with the head 59 mm. 

 wide. In both specimens the neck measured 12 mm. 

 Kroyer's Sphyrion bimpi was found burrowing in the tail fin 

 of a Cyclopterus lumpus from Iceland. It was two inches long. 

 The difference in the proportional sizes of its parts, the much 

 less nodulose head, the very "elongate neck," and the northern 

 habitat, make it at least possible that it may be a distinct 

 species. 



In 1871 (Tr. Linn. Soc. London, v. 27, p. 501, t. 59, fig. 12), 

 a third species was described by Dr. R. O. Cunningham, 

 M.D., F.L.S., under the name Sphyrio7i Kingi. The 

 specimens were taken from the gills of fish, on the East 

 Coast of Patagonia. The head is very distinctly nodulose 

 and the "neck" extremely short. But it is still an open 

 question whether either this or Kroyer's species should be 

 upheld as specifically distinct from laevigatum. 



