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 fothoms on the west coast of the Isthmus of Panama. It 

 combines in one form characters of the genera Maia, C//clomaia, Paramithrax 

 (subg. Lepiomithrax), and Schisoj)hri/s. In its general aspect it bears a close 

 resemblance to Mcda, and the likeness is enhanced by the small cj-es and 

 slender eye-stalk.s, the elongated wrist and hand, and the short epistome. It 

 differs from Maia in having a much broader carapace, a less deeplj' 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 C^clomaia, 

 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 Ci/clomaia in having a short epistome, 

 a .short and broad terminal abdominal .segment, and supraocular spines. It 

 differs from Ci/domaia by having a subtriangular carapace, longer rostral 

 spines, and a less abruptly declivous front. It is like Paramithrax and Schiso- 

 pkrys 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, 

 3Iaiopsis differs from Paramithrax and Schisophrys in having a more broadly 

 triangular carapace, supraocular spines, slenderer wrist and hand, less deeply 

 cleft rostrum, and spinose ambidatory legs. Like Scldzophri/s and Muidla, it 

 has an accessory spine on each rostral horn. In the shape of the carapace 

 Maiopsis is intermediate between Maia and Ctjclomaia. In the form of the 

 fingers it stands between Maia and Paramithrax on the one side and Schizo- 

 phrt/s 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 tlie genus Paramithrax so 

 that it may embrace this form, together with Cyclomaia and Schizophrys. 



