ORDER PCECILOPODA — PANDARUS. 59 



(EXTRALIMITAL.) 



Genus Pandarus, Leach. Body ovate, occasionally elongate, ending in two long filaments. Shield 

 rounded in front, truncate behind. Antennse two. Feet fourteen ; the six anterior unguiculated, 

 the others bifid. Body covered with transverse scales, dentate on their posterior edges. Para- 

 sitic. 

 P. sinuaius. (Say, 1. c. p. 436.) Body oblong, quadrate, dilated. Scales six: four suL equal, m a trans- 

 verse line at the base of the abdomen, rounded at tip ; two larger, arising beneatli the preceding, 

 slightly dentate at the tip, and not concealing half the abdomen, which is sinuate behind. Length, 

 0*2. Hab. body of Mustelus canis, or American Hound-fish. 



Genus Cecrops, Leach. Body oval, obtuse at the extremities, covered with four unequal scales which 

 are emarginate. No posterior filament. Feet fourteen ; the six anterior unguiculate ; fourth 

 or fifth bifid ; sixth and seventh with dilated coxse; the others membranous, dilated, natatory. 

 Antennfe two, very small. Parasitic. 

 C. latreilli, Leach. (De.sm. pi. 50, fig. 2. Storer, Rep. Fishes, p. 172. Pl. 10, fig. 44 of this work.) 

 Shield coriaceous, bipartite : the anterior portion obcordate, deeply emarginate behind ; the poste- 

 rior consists of three, overlapping each other, and becoming gradually larger from before. An- 

 temiEe of two joints, terminated by a single hair. Hab. Orihagoriscus mola. Northern Coast. 



GENUS LERNEA. Cuvier. 



Body long, cylindrical, more or less filiform ; enveloping membrane sub-coriaceous. Head 

 enlarged, with processes varying in number and size. Caudal extremities variously ter- 

 minated. Parasitic. 



Obs. The animals of this and the following genus were originally arranged under the Intes- 

 tinal worms. They have, however, notwithstanding their anomalous vermiform appearance, 

 too many characters in common with the crustaceans, to leave them where they were originally 

 placed. Some late writers have proposed to erect them into a distinct class between Insects 

 and Worms. 



■ ' »>» 

 f 

 *..*. « t Lernea cruciata. 



^' 



JUrncocera cruciata, LE3UECR, Ac. Nat. Sciences, Vol. 3, p. 286, pl. 11, fig. 4. 



Description. Body slender before, dilated behind, transparent ; mouth central, surrounded by 

 five robust processes. On the caudal extremity are five rounded tubercular processes. 

 Found attached to the Cichla cSnea, or Rock Bass of Lake Erie. 



8* 



