AMPITHOIDAE FROM SOUTHERN CALIFORNIA — BARNARD 7 



10. Lobules of lower lip slender, separated 11 



Lobules of lower lip stout, appressed (fig. Ik) valida 



11. Antenna 2 normally setose in male ramondi 



Antenna 2 strongly setose in male plumulosa 



12. Lobules of lower lip bulbous and appressed (fig. Ik) pollex 



Lobules of lower lip slender and separated 13 



13. Palm of gnathopod 1 obsolescent, article 5 as long as 6 (fig. Id) . longimana 

 Palm of gnathopod 1 distinct, article 5 much shorter than 6 (fig. le). 



simulans 



Antpithoe humeralis Stimpson 



Figures 2-3 



Amphithoe [sic] humeralis Stimpson, 1864, p. 156. — Caiman, 1898, pp. 271-273, pi. 



33, fig. 4.— Holmes. 1904, p. 241.— Hewatt, 1946, pp. 199, 204. 

 Ampithoe humeralis. — Stebbing, 1906, p. 636 — J. L. Barnard, 1954, p. 29. 



Diagnosis: Second and third pleonal epimera rounded behind, with 

 sHght lateral ridges; article 5 of male gnathopod 1 longer than article 

 6, hind edge truncated, not lobate, article 6 rectangular, slender, palm 

 transverse or slightly chelate, finger overlapping palm by its full 

 length; gnathopod 2 like gnathopod 1 except article 5 is slightly 

 shorter, although longer than article 6, and with a distinct, rounded 

 hind lobe; article 6 like that of gnathopod 1 ; article 2 of pereopods 1-2 

 about 1.7 times as long as broad; ventral edge of article 1 on antenna 

 1 lacking ventral spines; antenna 1 much longer than antenna 2, 

 ilagellum about four times as long as flagellum of antenna 2, neither 

 flagellum strongly setose; lateral apical lobule of lower lip much longer 

 than medial lobule, coxa 1 not produced forward; peduncidar process 

 or uropod 1 long. 



Female: Like the male. 



Material: Velero stations 1206 (7), 1409 (5), 1489 (1), 2052 (1), 

 4806 (2), 4822 (2). Barnard stations 33 (1), 42-C-7 (1). Oceano- 

 graphic Lab., Friday Harbor, Wash., Aug. 16-29, 1949, coll. Dr. J. L. 

 Mohr (13). Guadalupe Island, Dec. 9, 1946, 26-29 fms., coll. Dr. 

 Carl L. Hubbs (1). 



Records: Intertidal: Friday Harbor, Wash.; North Bay, Cape 

 Arago State Park, Oreg. ; Hazard Reef, S. of Morro Bay, Calif. Islands 

 off southern California: San Nicolas 4-9 fms.; Santa Barbara, 26-39 

 fms. Point Conception, Calif., 8-9 fms.; off Long Beach, Calif., 13 

 fms.; Off La Jolla, Calif., 1 fm. Guadalupe Island, Baja California, 

 26-29 fms. 



Relationship: This species is unique in Ampithoe for having the 

 male and female gnathopods identical, the male gnathopod 2 being as 

 small as gnathopod 1. 



Young males and females are difficult to separate from A. plea, A. 

 lindbergi, A. mea, and A. tea. 



Distribution: Puget Sound to Guadalupe Island. 



