NO. 1350. NATURAL HTSTORY OF THE TSiOFODA—RTCIIARDSON. 75 



Pt. 6, p. 311. — KossMAN, Zool. Ergb. einer Reise in die Kiist. des Rothen 



MeereH, III, Malaco.straca, p. 122; Mitthcil, aus der Zool. Station zu Xeapcl, 



III, 1881, first lialf, p. 182. 

 Plirijxus disfortuH Walz, Arbeit, aus d. Zoolog. Insti. d. Uuivers. \A'ien, IV, 



1882, p. 59. 

 Cepon(lidoi-tn><\l\i:n\iiV)iiO^, Am. Nat., XXXIV, 1900, p. ;-{09. 

 Leldya dhtortti Richardson, Proe. U. S. Nat. Museum, XXIII, 1901, j). 579. 



Locality. — Atlantic City, New Jersey, in the branchijil cavity of 

 Uca pugilator. 



lONE CORNUTA Spence Bate. 



lone cornuta Spence Bate, Proc. Zool. Soc. London, 1864, ]). 668; Lord's Natural- 

 ist in British Columbia, II, 1866, p. 282. 



lone cornuta Bate and Westwood, Brit. Sessile-eyed Crust., II, p. 253. — Giard 

 and Bonnier, Travaux de I'lnstitut zoologique de Lille et du Laboratoire 

 Maritime de "Wimereux, V, 1887, p. 77. — Richardson, Proc. U. S. Nat. 

 Museum, XXI, 1899, p. 869. 



Local liy. — Esquimault Harbor, British Columbia, in the branchial 

 cavity of OaUianassa longimana; Vancouver Island. 



ZONE THOMPSON!, new species. 



Body of female longer than broad. 



Head deeply set in thorax, its anterior margin produced in a crenu- 

 lated border. The antero-lateral lobes of the frontal border extend 

 some distance beyond the sides of the head. The posterior portion of 

 the head is evenl}^ rounded. The first antenna? are three jointed; the 

 second pair are five jointed. 



All the thoracic segments are distinct, with distinct epimera 

 ("lames pleurales" of Giard and Bonnier), in the form of large 

 rounded lobes, not elongated. In the first two segments these epi- 

 meral lobes occupy the anterior portions of the lateral parts of the seg- 

 ments; in the third segment they are placed about the center of the 

 lateral margin; in the fourth and fifth segments the}" occupy more of 

 a posterior position; in the sixth and seventh segments they occupy 

 the entire lateral margin. Ovarian bosses are present on the first 

 four segments, along the anterior portion of the segment. 



The six segments of the pleon are distinct, and are produced later- 

 ally, each in a pair of elongated and jointed appendages, furnished 

 with numerous mammilliform, branching appendages, originating 

 from the posterior margin and extending downward. Thus there are 

 six pairs of appendages corresponding to the "'"lames epimeriennes du 

 pleon" of Giard and Bonnier. 



The pleopoda consist of four pairs of double- branched appendages 

 and one pair of single-branched appendages." The inner branches of 



« The young female of lone thompsoni has the last pair of pleopoda double-branched, 

 the two l)ranches similar, however. The inner branches of the first four segments 

 are quite different from those of the outer branches, as is true of the adult female*, 

 and lie folded over the abdomen as in the adult described. 



