LEUCONID^E NANNASTACID^ 305 



Eudorella, Norman, 1867, is a name substituted for 

 the preoccupied Eudora, Spence Bate, 1856. It 

 has an oval orifice between the antero-lateral lobes 

 of the carapace, the pseudo-rostral projection 

 wanting, and the first antennae geniculate between 

 the last two joints. It contains eight species, 

 among which Eudorella emarginata (Kroyer) and 

 Eudorella truncatula (Spence Bate) are British. 

 Eudorellopsis, Sars, 1882, has the body short and stout, 

 the median lobe of the carapace not excavate, and 

 the first antennas geniculate between the first two 

 joints. It contains two species, Eudorellopsis de- 

 formis (Kroyer) and Eudorellopsis Integra, S. I. 

 Smith. 



Family 4. Nannastacidce. 



There may be either one eye or two eyes. The first 

 antennas are alike in both sexes, the flagella very unequal, 

 the smaller one- or two-jointed. The flagellum of the second 

 antennae in the male has rather long slender joints. 

 The mandibles have few spines on the anterior branch. 

 The epipod of the first maxillipeds has the branchial sacs 

 in the female very slightly developed. The third maxil- 

 lipeds have the terminal part irregularly flexuous. The 

 first two pairs of peraeopods in the female and the first 

 four in the male have well-developed swimming-branches. 

 The last three pairs of perasopods are very slender and 

 end in a curved finger. The pleopods are wanting in 

 both sexes. The inner branch of the uropods is one- 

 jointed. The telson is wanting. 



Sars calls this family the Cumellidaa, but Spence 

 Bate's name Nannastacidas has clear priority. It contains 

 three or four genera. 



Nannastacus, Spence Bate, 1865, means 'a dwarf lob- 

 ster.' It has two distinct compound eyes. The carapace 

 is broad in front or with elongate pseudo-rostrum. The 

 British species, Nannastacus unguiculatus, Spence Bate, and 

 Nannastacus Suhmii, Sars, from the Philippines, have the 



x 



