FAMILY SPHHZROMIDZ. 125 
omitted here. Gourret established (1891) on females two 
new species of Dynamene, viz. D. corallana and D. setosa 
from the southern coast of France, but according to kind in- 
formations from the zoological authorities at the Museums 
in Marseille his typical specimens could not be found; judg- 
ing from the shape of the maxillipeds and the abdominal notch, 
the animals are females of the genus Cymodoce, and the 
descriptions and figures given by him will scarcely allow 
recognition of the species. It may be added that I am 
acquainted with males and females of two fine species from 
the Mediterranean; one of these constitutes as to the situa- 
tion of the respiratory foramen toa certain degree a transition 
stage to the genus Nesicopea (Stebb). 
Of exotic species referred to Nesa no one belongs to the 
present genus. Nasa caudata (Say) I take as the type for 
the genus Paracerceis (n. gen.) ; Nesaovalis (Say) is my 
type for Cassidinidea (n. gen.) belonging to the platy- 
branchiate Spheromine; Nesa canaliculata (Thoms.) is, 
as mentioned above, a species of Cilicea (Leach); Nesa 
depressa (Say) is the type for the genus Ancinus (M.—Kdw.). 
Of exotic species referred to Dynamene scarcely any one can 
remain in this genus. D. Hatoni (Miers), established on 
immature animals, seems to be a species of Dynamenella. 
According to kind information from Dr. Calman, D. Darwinii 
(Cunningham) has exp. of plp.* divided by an articulation ; 
the species must, in my opinion, be established as a new genus 
near Paracerceis. Dynamene perforata (Moore) I 
establish as the type for Dynamenella (n. gen.) ; Dyna- 
mene bermudensis (Ives) is, according to my examination 
of specimens from the U. 8. National Museum, females of a 
species of Paracerceis closely allied to P.caudata (Say) ; 
Dynamene angulata (Richardson), D. Benedictii 
(Richardson), and D. glabra (Richardson) are probably 
females and immature specimens either of Dynamenella or 
Paracerceis, but as the structure of the pleopods, etc., is 
unknown it is, of course, impossible to refer them to genera 
with certainty. On D. tuberculosa (Richardson) I have no 
