2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



Ampitlioids bear spinning glands in pereopods 1 and 2, which are 

 used to form soft parchment-like tubes for inhabitation. Apparently 

 the tubes are formed mostly among the holdfasts of kelps, smaller 

 algae, and surfgrass. Limbaugh in a mimeographed report from 

 Scripps Institution of Oceanography reported on an Ampithoe that 

 rolls up the edge of a Macrocystis blade, "stitches" it along the seam, 

 and lives in the enclosed tube. Ampithoids follow algae down to 

 their photic limit; hence ampithoids live to greater depths in the 

 channel islands off southern California, where the waters are clearer, 

 than along the mainland shelf where the waters are quite turbid and 

 algae rarely grow below 30 meters. 



I am indebted to the National Science Foundation for a grant 

 (G- 10750) that supported the illustration of this work, and to the 

 Beaudette Foundation for my support. Portions of the materials are 

 deposited in the U.S. National Museum and the Allan Hancock 

 Foundation, University of Southern California. 



Key to Species of World Ampithoe 



1. Third pleonal epimeron with a point at the lower posterior corner ... 2 

 Third pleonal epimeron rounded at lower posterior corner 4 



2. Male gnathopod 1: fifth article 1.8 times as long as article 6. 



tarasovi (check mitsukurii also) 

 Male gnathopod 1 : fifth article subequal to or shorter than article 6 . 3 



3. Flagellum of antenna 1 shorter than flagellum of antenna 2 . australiensis 

 Flagellum of antenna 1 almost twice as long as flagellum of antenna 2. 



lacertosa ( = scitula) 



4. Gnathopod 1: palm distinctly transverse, short, corner sharply quadrate, 



article 6 linear, posterior edge straight, article 7 greatly overlapping 



palm (fig. la) 5 



Gnathopod 1 : palm, if present, oblique 14 



5. Flagellum of second antenna 2-4 articulate or very stout (fig. In) ... 6 

 Flagellum of second antenna slender or more than 8-articulate (fig. Im) . 8 



6. Article 2 of pereopods 3-5 quite narrow, linear plea 



Article 2 of pereopods 3-5 broad, biconvex 7 



7. Lobe of article 5 on male gnathopod 2 acute . . brevipes (of Bate 1862) 

 Lobe of article 5 on male gnathopod 2 obtuse but narrow .... lindbergi 



8. Male gnathopod 2 similar to gnathopod 1 humeralis 



Male gnathopod 2 much larger than gnathopod 1 9 



9. Palm of male gnathopod 2 minutely and irregularly serr'Bte its full 



length annenkovae 



Palm of male gnathopod 2 not serrate for its full length. 



femorata, brevipes, falsa, orientalis, and those of couplet 10 



10. Gnathopod 1: article 6 extremely slender (fig. la). 



orientalis (of J. L. Barnard 1955) 

 Gnathopod 1 : article 6 moderately stout 11 



11. Female gnathopod 2: palm transverse 12 



Female gnathopod 2: palm oblique 13 



