22 



CARIDAE. 



(Forms with but two pairs of chelate legs, mostly smaller 

 species.) 



6. Bithynis oliionis (Smith). (Plate V, figure 1.) 



The so-called "River Shrimp." Very abundant in the Mis- 

 sissippi River and has also been taken a few times in the 

 Calcasieu River. Smaller than the large "Lake Shrimp," 

 but highly prized as a table form. This species is entirely 

 a fresh-water form, and may become about twice as large as 

 the specimen figured. The breeding season is very long and 

 females in "berry" may be found from April through into 

 the summer. The exact length of the breeding season has 

 not been determined. 



7. Palaemon tenuicornis (Say). (Plate V, figure 2.) 



A smaller species, with a rather compact body, found in the 

 salt or brackish water along the coast. 



8. Palaernonetes carolinus (Stimpson). (Plate V, figure 3.) 

 This small species is sometimes called the "Grass Shrimp," 

 from its habit of lurking among the weeds and grasses bor- 

 dering the bayous and smaller streams along the coast. It 

 is a salt or brackish water form, but seldom becomes as large 

 as the preceding species. At times it has been extremely 

 abundant in Calcasieu Pass, especially during summer. Fe- 

 males in "berry" are found throughout the latter part of 

 the summer. 



9. Tozeuma carolinense (Kingsley). 



A rather peculiarly shaped form, with a very long rostrum, 

 a single specimen of which was found among the sea weeds 

 near Errol Island in the spring of 1906. 



10. Thor floridmius (Kingsley). 



A small species, a few specimens of which were found near 

 Errol Island in 1906. 



11. Hippolyte zostericola (Smith).) 



Another small species, slightly resembling the last, which 

 was also found near Errol Island in 1906. 



12. Concordia giooerosa (Kingsley). 



A small species, a few specimens of which were found 

 among the sea weeds near Errol Island in the spring of 

 1906. 



