NO. 2286. THE NEW COFEPOD FAMILY SPHYRIIDAE—WILSOl^. 593 



line, and they are evidently the chief organs of prehension. The 

 posterior ends of the oblique knobs are connected by a ridge across 

 the median line, which curves forward at the center. 



A third pair of knobs are s])herical and are situated on the ven- 

 tral surfaces of the lateral processes, so far from the midline as to 

 lie wholly exterior to the base of the neck. The ventral surface of 

 the neck between and behind them projects strongly and on it may 

 be seen the transverse chitin rod that probably connected the bases 

 of a pair of swimming legs. 



The neck is one-fourth the width of the head and about one-third 

 the entire length of the body. It is of the same diameter throughout, 

 with fairly distinct segmentation, but with no apparent traces of 

 appendages. Where the neck joins the genital segment, which is the 

 portion in contact with the skin of the host, it is slightly enlarged 

 and thrown up into numerous transverse wrinkles; elsewhere it is 

 tolerably smooth. 



Within this wrinkled area the neck passes insensibly into the 

 trunk, which then widens gradually to its posterior end, where it is 

 about the same width as the head. The trunk is more than fou] 

 tiiiics i!s long as wide, and at the posterior end is three times as wid 

 as thick. Near its anterior end the division between the fourth ana 

 fifth thoracic segments is clearly indicated by a break in the longi- 

 tudinal musculature and by grooves on the lateral margins. Tiie 

 anterior ends of the oviducts extend a short distance in front of this 

 dividing line. The corresponding division between the fifth and 

 genital segments is found near the anterior end of the cement glands, 

 and still farther back is another break just in front of the anal 

 laminae indicating the division between the genital segment and the 

 abdomen. 



The surface of the trunk is generally smooth, with a few scattered 

 wrinkles and with small pits caused by the attachment of the dorso- 

 ventral muscles that separate the coils of the oviducts. At the 

 posterior end the lateral margin is produced into a rounded lobe 

 on either side, which turns slightly downward and outward. The 

 abdomen is so reduced that it would not be mentioned if it were 

 not for the distinct break in the musculature. But this indicates 

 definitely that the posterior processes are given off from the dorsal 

 surface of the abdomen as in the other genera. Each process is one- 

 third as long as the rest of the body, is curved like a parenthesis 

 mark, has the same diameter throughout, and is bluntly rounded at 

 the end. The anal laminae are swollen into knobs beneath the bases 

 of the posterior processes and more or less fused with them. The 

 ^gg strings are cylindrical and are attached to the inner margins of 

 the posterior lobes of the genital segment ; each is two-thirds as wide 



