REVIEW OF GENUS ARGULUS MEEHEAN 515 



toward the edge (fig. 44, c). Marginal lappets long and slender. 

 Second maxillae with a narrow basal plate, teeth standing out 

 abruptly from it and very sharp. Two median pairs of spines very 

 sharp, proximal tooth on plate more widely separated than other two. 



Swimming appendages with flagella. Prominent boot-shaped 

 lamella on posterior surface of fourth appendage of female, tactile 

 papillae prominent and long. Male second appendages with a very 

 broad thin lamella on ventral posterior edge of coxa extending con- 

 siderably back over the next appendage with a lateral prolongation 

 of distal edge. Third appendages with a long somewhat triangular 

 flap on the anterior surface extending from the distal end of the 

 coxa over the basis to the base of the exopod. The basis is rounded 

 posteriorly where the socket is located; there is a slight protuber- 

 ance on the ventral side of this segment. The fourth appendage has 

 a boot-shaped lamella of considerable size without a heel. The peg 

 is located on the distal edge of the basis near the origin of the exopod 

 and is pear-shaped, with a broad base and a narrow short projection 

 laterally (fig. 44, a). Around the base obliquely across the segment 

 is a chitinous ridge armed with short spines. The male opening is 

 indicated by a stout cylindrical papilla at the end of the thorax 

 between the appendages. 



Females have been reported up to 11 mm. and males to 8 mm. 

 Found on Cylindrosteiis platostoTnus and Lepisosteus osseus at De- 

 fiance, Ohio; Fairport, Iowa; New York Aquarium (probably from 

 Southern States) ; Buffalo, N. Y. ; Kingston (State not indicated by 

 Thiele) ; and Put-in-Bay, Ohio. Specimens were collected at Reel- 

 foot Lake by Dr. C. L. Baker from the short-nose gar {Lepisosteus 

 sp.). Dr. Bangham collected them in Florida on the spotted gar 

 {Lepisosteus sp.) at Naples and in the Everglades Canal at Wood- 

 mere and Englewood. 



ARGULUS NOBILIS Thiele 

 FiGUKE 45 



Argulus nohilis Thiele, 1904, p. 28, figs. 64-76. 



Argulus ingens Wilson, 1912b, p. 233, pi. 30, pi. 31, fig. 7. 



Argulus noMlis var. ingens Wilson, 1924, p. 2. 



Carapace elliptical ; cephalic area prominent in male, not so prom- 

 inent in female ; sinus extending to the middle of carapace or beyond ; 

 alae reaching to the edge of the abdomen. Abdomen heart-shaped 

 in female, with anterolateral projections in male; anal sinus extend- 

 ing almost to middle of abdomen in male, reaching middle in female; 

 tips of abdomen pointed, sides of sinus flaring; anal furcae one-tliird 



