A REVIEW OF THE MYSIDACEA 105 



yan Bay Anchorage, Mindanao Strait, surface, electric light, Decem- 

 ber 13, 1908, 9 p. m. 



Distribution. — Known only from the specimens from the Philip- 

 pine Islands. 



ANCHIALINA AGILIS (G. O. Sars) 



Anchialus agilis G. O. Sabs, 1877, p. 78, pis. 26-28. 



Occurrence. — Scilly Islands, Cornwall, England*. Identified by 

 G. E. Bullen. 



Distribution. — Mediterranean ; eastern Atlantic from Spain to the 

 English Channel and the coasts of Ireland. 



Subfamily Mysinae 



Two pairs of oostegites in the female; labrum generally broader 

 than long, without frontal process, rounded behind ; mandibles with 

 the cutting lobe not expanded and its edge dentate ; maxillules normal 

 with oblique lacinia; maxillipeds with the sixth joint normal and 

 without any free and aculeate terminal margin ; endopod of the third 

 to the eighth thoracic limbs with the carpus either distinct and un- 

 divided and the propodus alone subdivided into subjoints, or the 

 carpus and propodus fused and the combined joints subdivided into 

 several subjoints; fourth pleopod of the male with the rami either 

 similar and well developed, or generally with one of the rami, most 

 frequently the exopod, more or less elongated, while the remaining 

 ramus and both rami of the second and third pair are either well 

 developed, normal, or more or less reduced, sometimes all the pleopods 

 in the male rudimentary ; first abdominal somite in the female without 

 lateral lamellae; exopod of the uropods undivided, its outer margin 

 setose and without spines; endopod of the uropods generally con- 

 siderably shorter than the exopod. 



Tribe ERYTHROPINI 



Endopods of the third to the eighth thoracic limbs with the carpus 

 distinct and undivided and the propodus divided into a small number 

 (usually two) of subjoints; four posterior pleopods of the male well 

 developed, exopod of the fourth pair rarely and at most only slightly 

 elongated, endopod of the same pair sometimes elongated, and in 

 several genera one of the rami with modified setae; antennal scale 

 nearly always with a pronounced external tooth, and, even if this is 

 wanting, at most the distal half of the outer margin setose; scale 

 may be styliform or wanting. 



Remarks. — Twenty-six genera are included in this tribe, and 16 of 

 these occur in the National Museum collection. In general, the species 

 of this tribe inhabit moderately deep and deep water and are seldom 

 actually littoral in habit. 



