ABT. 25 THE AMPHIPOD FAMILY BATEIDAE SHOEMAKER 13 



beyond the second joint of the peraeopod, sides nearly parallel but 

 slightly wider below, lower margin transverse, very slightly convex 

 and bordered by a row of minute setules. Side-plate 4 with hind 

 margin not so deeply excavate as in B. catharmenm^, lower margin 

 unevenly convex and bordered by a row of minute setules. Side- 

 plate 5 with hind lobe deeper and more acute than in B. cathari- 

 nensis. Side-plates 6 and 7 differing very slightly from those of 

 B. catharinensis. Posterior lateral margin of abdominal segment 3 

 bearing a greater number of serrations than that of B. catharinensis. 

 Uropods about as in B. catharinensis. Telson proportionately 

 shorter and broader than in B. catharinensis^ lobes with apices acute 

 and inside margins concave, each lobe with two setules near the 

 apex, and each side of telson bearing three setules near the base. 

 Length of the type specimen 6 mm. The only known specimen of 

 this species was obtained by the steamer Albatross in 1911 in San 

 Francisquito Bay, Gulf of California, and established the first record 

 of the occurrence of this genus on the west coast of America. The 

 type is in the collection of the United States National Museum, cata- 

 logue number 523G0. 



BATEA TRANSVERSA, new species 



(Figures 8-11) 



Female. — Head with rostrum evenly-curved downward and very 

 acute, under edge evenly concave. Eyes large, black. Antennae 

 normal. Mandible with third joint of palp a little over half the 

 length of the second, spine arrangement of these two joints as in 

 B. rectangulata, five spines in spine-row of left mandible, and four 

 in that of right. Maxilla 1, inner plate with six or seven plumose 

 setae, outer plate armed with stout, curved, toothed spines as in 

 B. rectangulata., palp with first joint nearly two-thirds the length of 

 the second. Maxilla 2, inner plate reaching nearly to the end of 

 outer plate, spine and seta arrangement as in B. reotangulata. 

 Maxillipeds, inner plate reaching nearly to the end of first joint of 

 palp, armed on its truncated end with three rather blunt spine-teeth, 

 and on the truncated end and inner margin with plumose setae, 

 outer plate reaching nearly to the end of the second joint of palp, 

 armed on its upper rounded end and inner edge with tooth-like 

 spines, second joint of palp a little longer than first or third which 

 are subequal, dactyl evenly curved throughout, point not dipping 

 down as in B. reotangulata. Lower lip without inner lobes. Gnath- 

 opod 1 normal. Gnathopod 2 proportionally nearly as in B. rec- 

 tangulata., fifth, and sixth joints long and narrow, sixth about four- 

 fifths as long as fifth, widest at distal end, palm nearly transverse, 

 being only slightly oblique, dactyl with three forward-pointing teeth 

 on inner edge. Peraeopods 1 and 2 normal. Peraeopod 3, second joint 

 79649—26 3 



