AMPITHOIDAE FROM SOUTHERN CALIFORNIA — BARNARD 19 



Holotype: Allan Hancock Foundation No. 5737, male, 8.5 mm. 



Type locality: Velero station 4806, Palos Verdes Headland, Los 

 Angeles Co., Calif., 33-44-13 N., 118-23-08 W., 8 fms., Jan. 6, 1957. 



Material: Velero stations 4806 (8), 4823 (1 juv.?) 4956 (1). Camp- 

 bell station 5 (juv. 1?). 



Records: Near Coal Oil Point, Calif., 8 fms.; Goleta, living in hold- 

 fast of Macrocystis pyrifera; Palos Verdes Headland, Calif. ; off Santa 

 Barbara, Calif., 17 m. 



Relationship: This species is closely related to A. orientalis Dana, 

 as reviewed by J. L. Barnard (1955) but differs by the very short, 

 stout male second antennal flagellum and by gnathopod 1 which is 

 much stouter, especially article 6, its palm well developed and with 

 article 7 scarcely overlapping the palm. The second articles of 

 pereopods 1-5 are more slender in the new species. 



Ampithoe mea Gurjanova (see 1951) is another relative, but again 

 its first gnathopod is more slender, the palm shorter, and the finger 

 overlappmg the palm more strongly. The second antennal flagellum 

 of A. mea, although tending to be short and stout, has 22 articles. 

 The first antenna has a stout spine on peduncular article 1. Probably 

 A. mea and A. eoa Gurjanova (see 1951) are synonomous despite 

 Gurjanova's careful analysis of then- differences in a table on p. 885. 

 For instance, her figure of pereopod 3 (fig. 616) is indeed pereopod 

 2 and so is not comparable to the third pereopod of A. eoa. Ampithoe 

 mea is simply a younger stage of A. eoa, the male finger on gnathopod 

 2 being shorter (see A. orientalis in J. L. Barnard [1955] and other 

 species of Ampithoe herem, where the gnathopodal development is 

 traced) and the disparity in thickness between articles 5 and 6 of 

 pereopod 5 increasing with age. The present new species differs 

 from both A. mea and A. eoa in the development of a process near the 

 finger hinge in adult male gnathopod 2. 



Ampithoe lindbergi Giu-janova (see 1951) is a distinct species also 

 available in the present collections. Its second antenna has the 

 short thick flagellum, but again its first gnathopod is very slender 

 with the strongly overlapping finger; however, one might imagine 

 that its second gnathopod could develop into that of A. plea with ad- 

 vancing age. Perhaps there are differences in the second articles 

 of pereopods 3-5 because in the new species they are abnormally 

 slender; they have not been described for the types of A. lindbergi. 



Ampithoe annenkovae Gurjanova (see 1951) is another species 

 with the long palm and finger of male gnathopod 2. Its second 

 antennal flagellum is slender although only 9-articulate and perhaps 

 the antenna shown is for the female. If so, and the male antenna had 

 been broken, it would be conceivable that A. annenkovae males are 



