12 STALK-EYED CRUSTACEA. 
_ 
not distinctly toothed; ambulatory legs spinose. Abdomen (male) seven- 
jointed, terminal joint short and broad. 
This genus is proposed for the reception of an interesting Maioid 
dredged in 182 fathoms on the west coast of the Isthmus of Panama. It 
combines in one form characters of the genera Maia, Cyclumaia, Paramithrax 
(subg. Leptomithrax), and Schizophrys. In its general aspect it bears a close 
resemblance to Maia, and the likeness is enhanced by the small eyes and 
slender eye-stalks, the elongated wrist and hand, and the short epistome. It 
differs from Maia in having a much broader carapace, a less deeply cloven 
rostrum, spinose legs, supraocular spines, and trenchantly in the exclusion 
of the antennal flagellum from the orbit by a process of the basal segment 
of the antenna. In the latter regard it agrees with the genus Cyclomaia, 
the basal segment of the antenna being very broad, three-spined on its distal 
border, and giving off a process which separates the flagellum from the orbit 
by a wide interval; it also agrees with Cyclomaia in having a short epistome, 
a short and broad terminal abdominal segment, and supraocular spines. It 
differs from Cyclonaa by having a subtriangular carapace, longer rostral 
spines, and a less abruptly declivous front. It is like Paramihrax and Schizo- 
parys in the exclusion of the basal antennal segment from the orbit, but this 
segment is much broader than in these genera, and three-spined ; moreover, 
Maiopsis differs from Paramithrax and Schizophrys in having a more broadly 
triangular carapace, supraocular spines, slenderer wrist and hand, less deeply 
cleft rostrum, and spinose ambulatory legs. Like Schizophrys and Maiella, it 
has an accessory spine on each rostral horn. In the shape of the carapace 
Muaiopsis is intermediate between Maia and Cyclomaia. In the form of the 
fingers it stands between Maia and Paramithrax on the one side and Schizo- 
phrys and Cyclomaia on the other, as the fingers, though canaliculate within, 
are but slightly excavated at the tips. 
The synthetic character of the species upon which this genus is based 
suggests the propriety of extending the scope of the genus Paramithrax so 
that it may embrace this form, together with Cyclomaia and Schizophrys. 
