THE FAIRY SHRIMPS (PHYLLOPODA) 



673 



60 (53) First and second post-cephalic limbs prehensile in the male; carapace 

 distinctly bivalve, enclosing head, with concentric growth 

 lines around a more or less prominent umbo. 



Family Limnadhdai: .61 



61(66) With pediculated dorsal organ on front of head 6i 



62 (63) Shell broad oval, much flattened, subtriangular, with about 18 lines 

 of growth; fiagella of second antenna 12- to is-segmente<l; 



18 to 22 pairs of limbs " I^hmuuiia. 



Only one species Limmidia iinuriccjna Morse iH-js. 



This species was described from specimens colIccte<l 

 at Lynn, Massachusetts. 



Another possible species, Limnadia coriofea lialdc- 

 man, was collected at Cincinnati and in ditches ahing 

 the Susquehanna river, but it has not been sufTuiently 

 described so that its relati(jnships can be determine*!. 

 See Packard (1883, pp. .51.5, ,} 14). 



Fig. 1041. Limnadia americana. Side view. 

 (After Packard.) 



X \. 



63 (62) Shell narrow-ovate, rather prominent behind the umboncs with 4 to 



5 lines of growth; fiagella of second antennae q- to lo-seg- 

 mented; 18 pairs of limbs Eulimnadia . . 64 



64 (65) Shell narrow-ovate, with 4 lines of growth; telson with 12 pairs of 

 • ^ "* dorsal spinules not including the terminal spine. 



Eulimnadia agassizii Packard 1S74. 



This small crustacean has only been o})ser\-e<l on 

 Penikese Island, Massachusetts. The fi^'ure shows 

 the large dorsal organ projecting above the eye. The 

 valves of the carapace are whitish and ver\- trans- 

 parent. Their shape is regularly oval. 



Fig. 1042. 



Eulimtuidia agassizii. Side view. X a. 

 (Alter Packard.) 



65 (64) Shell narrower than that of Eulimnadia agassizii, with 5 lines 01 growth ; 

 telson with 16 fine teeth above. 



Eulimnadia tcxana Packard 1S7.'. 



The valves of the carapace are whitish and 

 rounded oval in shape. 



This species has l)een collectetl in Kansas, 

 Nebraska, and Texas. It is s;iid to be com- 

 mon in the last locality in early spring. The 

 figure shows only the shape of the shell. 



Fig. 104,?. Eulimruuiia trxan^t. Shape of shell, 

 side view. X 7. (.After P.-tckard.) 



66 (61) Shell oval, more or less globose, with 18 to 22 lines of growth, amber 

 colored; no pediculated dors;il-organ on front of head; 

 fiagella of second antennae 11- to 17-segmented; 24 to 28 

 pairs of limbs Estluria . . 67 



