696 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 47. 



RemarJcs. — This species is fairly common on the menhaden, but 

 only one or two specimens are found upon the same fish. It can be 

 at once distinguished by its minute size, by the long and slender 

 cephalothorax, and by the kidney-shaped egg strings, carried at an 

 angle with the trunk axis. Different specimens vary considerably 

 in the size and armature of the antennae, as well as in the angle at 

 which the egg strings are carried. The males correspond more 

 closely than the females, and there is enough conformity among the 

 latter to insure the validity of the species. 



CLAVELLISA OVALIS (Kr)*yer). 

 Anchorella ovalis KR0yER, 1837, p. 289, pi. 3, fig. 6a and b. 



Host and record of specimens. — Kr0yer found a single specimen of 

 this species, without egg strings, on the gills of TrigU gumardus; no 

 locality given. 



Bermr'ks. — From Kr0yer's description and figure it is certain that 

 he had a Lernaeopod very similar to the ''Anchorella enmrginata" 

 which he had just described. In distinguishing the tv/o he says 

 that in A. ovalis the trunk is thick and egg-shaped, the cephalothorax 

 is one and a half times as long as the trunk and of medium thick- 

 ness, the head is short and broad, but thick. His figure shows that 

 the cephalothorax is attached to the center of the dorsal surface 

 of the trunk, while the second maxiUae are attached to the ventral 

 surface some distance from the base of the neck. 



He did not describe the appendages at aU, but the above facts are 

 enough to locate the species in the present genus. 



Beneden afterwards (1870, p. 31, pi. 2, fig. 8) figured a parasite 

 which he referred to this species, but which certainly did not belong 

 here as can be seen from a comparison of Kr0yer's and Beneden's 

 figures. Beneden's species had a short and thickset cephalothorax 

 attached in the usual way to the anterior end of the trunk, while the 

 second maxillae were on the neck some distance above where it joins 

 the trunk. 



EarMer in the same paper (p. 270) Kr0yer described a species which 

 he named "Lernaeopoda ohesa." He had but a single specimen and 

 had forgotten the host, but thought it was "Squalus acantUus Linn." 

 In 1869 Olsson found the same parasite upon the gill arches of the 

 common gurnard, Trigla gurnardus, and transposed it to the genus 

 BracUella. It is this species ohesa rather than the species ovalis 

 which Beneden and Scott have found upon the gurnard (see p. 701). 

 It belongs in the genus BracUella where Olsson placed it, but Kr0yer's 

 ovalis just as certainly belongs here in the genus Clavellisa. 



