8 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.68 



greatly expanded, widest through the proximal third, distal portion 

 of hind margin produced into a broad, downward-projecting lobe 

 reaching below the third joint, remaining joints as in the preceding 

 peraeopods. Side-plate 2 about as deep as its segment, front margin 

 convex, forming an almost even curve with the lower margin, lower 

 anterior angle scarcely discernible, hind border in male slightly 

 convex, in female nearly straight. Side-plate 3 expanded below, 

 sides and lower margin nearly straight. Side-plate 4 a little deeper 

 than its segment, very broad and deeply excavate on the upper hind 

 margin. Side-plates 5 and 6 shallow with hind lobe much deeper 

 than front. Side-plate 7 shallow with lower margin evenly convex. 

 Abdominal segment 3, lower hind margin evenly convex, lower half 

 armed with a row of fine upward-pointing teeth at the base of each 

 of which is a setule. Uropod 1 reaching farther back than 2 but not 

 so far as 3, peduncle a little longer than rami, outer ramus slightly 

 shorter than inner. Uropod 2, peduncle verj^ little longer than inner 

 ramus, outer ramus two-thirds the length of inner. Uropod 3, 

 peduncle short, rami lamelliform and spear shaped, provided on 

 their outer and inner edges with many short spines and long plu- 

 mose setae. Telson cleft beyond the middle, apices blunt and 

 rounded, inner edges convex. 



Adult specimens measure from 5 to 8 mm. in lengih. I have 

 examined specimens of this species from Woods Hole, Mass.. 

 Chesapeake Bay, coast of South Carolina, west coast of Florida, and 

 Barbados and I can not detect any specific differences. Batca secunda 

 Holmes is undoubtedly identical with Batea catharinensis Midler. 

 The coxal joint of the first gnathopod, one of the characters which 

 Holmes used for fixing his species, is extremely rudimentary and 

 imperfectly formed so that it is very difficult to assign any definite 

 form or size to it. 



There are in the collection of the United States National JNIuseum 

 the following specimens: 20 specimens collected at Woods Hole, 

 Mass., by S. J. Holmes, July 18, 1901 ; 28 specimens collected at 

 Woods Hole. Mass., by Dr. C. J. Fish, June 10, 1922; 3 specimens 

 collected in Tangier Sound, Chesapeake Bay, by the steamer Fish 

 Hawh^ June 4, 1891 ; 100 specimens collected one mile inside of May 

 Eiver, South Carolina, by the steamer Fish Hawk, January 17, 1891: 

 200 specimens collected at west end of Skull Creek, South Carolina, 

 by the steamer Fish Hawk, January, 1891; 1 specimen collected at 

 the mouth of Bull's Creek, near Cooper River, South Carolina, by 

 the steamer Fish Hawk, January 18, 1889 ; 1 specimen from Tampa 

 Bay, Florida, collector and date unknown; several hundreds of 

 specimens from Chesapeake Bay, collected by the steamer Fish Hawk 

 during the years 1915 to 1921. 



