660 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



2. Cephalothorax the same length as the rest of the body, thick and stocky 3. 



3. Egg strings longer than the trunk and parallel amplectens (Kurz), 1877. 



3. Egg strings much shorter than the trunk and inclined toward each other. 



occidentalis, new species, p. 663. 



NAOBRANCHIA LIZAE (Kr»<yer). 



Plate 27, fig. J; plate 42, figs. 121 to 124; plate 43, figs. 125 to 132; plate 44, fige. 133 



to 135. 



Anchorella lizae Kr0yer, 1863, p. 29, pi. 16, fig. 11 a to c. 



Host and record of specimens. — Four adult and two young females 

 and two males were obtained by Dr. Edwin Linton from the gills 

 of the common mullet, Mugil cefhalus, at Beaufort, North Carolina, 

 July 10, 1901. They are numbered 39611, U.S.N.M. Doctor Linton 

 states that other specimens were found later the same year, and 

 still others during the following years, so that it is fairly common 

 on the mullet. 



Specific characters of female. — Cephalothorax cylindrical, longer 

 than the trunk and tapering gradually and uniformly; head excep- 

 tionally small, neither enlarged nor separated from the neck and 

 covered with a minute dorsal carapace; neck slender and separated 

 from the trunk by a well defined dorsal groove and ridge; trunk 

 rectangular, with rounded corners, three-fifths as wide as long, and 

 strongly flattened dorso-ventrally; anterior portion of the trunk 

 making up the full width, posterior portion much narrowed, with 

 the rectangle filled out along the lateral margins by the egg strings. 

 In young females the genital segment is well differentiated, some- 

 what enlarged, with strongly convex sides, which are prolonged 

 into a pair of stout conical posterior processes on a level with the 

 ventral surface. To each of these processes is attached one end of 

 the rib, which supports the membrane covering the egg string on 

 that side. Inside of these processes there is a short and narrow 

 one-jointed abdomen, to the posterior margin of which is attached 

 a pair of minute conical anal laminae. In the adult female this 

 abdomen is practically absorbed into the genital segment, the only 

 indication of it being the anal laminae. The egg strings are pecul- 

 iar in being turned forward along the lateral margins of the trunk 

 and backward a Httle beyond the tips of the posterior processes. 

 They are club-shaped, largest near the posterior ends and tapering 

 rapidly anteriorly. They are a Httle more dorsal than ventral, 

 especially at the posterior ends. They are covered and held securely 

 in place by a transparent membrane, strengthened by a rib which 

 runs along the center of the outer surface (fig. 127), turns dorsally 

 at the posterior end, runs forward a little ways, and then turns 

 inward to the dorsal surface of the trunk (fig. 132). The eggs are 

 rather large and not arranged in rows, from 150 to 175 in each egg 

 string. The two egg strings touch dorsally at their widened pos- 



