640 PROCEEDINGS OF THE NATIONAL MUSEUM. 



entiated thorax segments, the posterior processes are dorsal instead 

 of ventral, and the male is radically different from that of Lernae- 

 o])oda, so that it can not belong to that genus. 



On the other hand the female agrees with that of Lernaeoyodina 

 in every particular except the segmented exopod of the second 

 antennae, and the male corresponds save for the fact that the trunk 

 is segmented. This latter is probably due to the stage of develop- 

 ment of the male, since we find similar differences in every genus 

 in the family where the males are known. 



We are thus left with the single difference mentioned in the female 

 and may refer the species to the present genus. 



Lernaeopoda similis T. and A. Scott, 1913, p. 202, for the same 

 reasons just enumerated can not remain in the genus where it was 

 placed. No details are given of the appendages or mouth parts, 

 nor is the male known, yet the excellent colored figures and the 

 brief description leaves but httle doubt that the species belongs here 

 in the new genus rather than in Lernaeopoda. 



Lernaeopoda spinacis Brian, 1912, p. 36, is also transferred to 

 the present genus. Biian described and figured both sexes of this 

 species, and while the male agrees with that of Lernaeopodina in all 

 essential particulars, the female differs in the fact that it has no 

 posterior processes. This is an important difference but not enough 

 to warrant the erection of a new genus, and as the species shows 

 greater affinity with Lernaeopodina than with any other genus in 

 the family it is placed here. 



TABLE OF SPECIES. 



1. Second maxillae filiform and definitely longer than the trunk 2. 



1. Second maxillae stouter and definitely shorter than the trunk 3. 



2. Second maxillae three times the length of the trunk; posterior processes cylin- 



drical and half as long as the trunk; maxillipeds small and weak. 



longibrachia (Brian), 1912, p. 641. 

 2. Second maxilae but little longer than the trunk; posterior processes flattened 

 and foliaceous; second antennae chelate; maxillipeds large and strong. 



longiviana (Olsson), 1869. 



2. Second maxillae but little longer than the trunk; posterior processes cylin- 



drical, but less than one-fourth the length of the trunk; second antennae 

 simple; maxillipeds large and strong cluthae {T. Scott), 1900. 



3. Cephalothprax much elongated; posterior processes conical, slender; egg strings 



slender and as long as the trunk; dorsal carapace very indistinct. 



similis (T. and A. Scott), 1913. 

 3. Cephalothorax short and wide; posterior processes stout, cylindrical; egg strings 

 stout and only half the length of the trunk; dorsal carapace well defined. 



relata, new species, p. 641. 

 3. Cephalothorax short, wide, and depressed; posterior processes mere knobs; egg 

 strings stout and as long as the trunk; dorsal carapace well defined. 



spinacis Brian, 1908. 



