86 U.S. NATIONAL MUSEUM BULLETIN 2 78 



The females of these two species are difHcult to distinguish; however, 

 the projection on the anterior margin of pereonite 2, although small 

 in P. pusilla, is still smaller in P. tenuis, and the basis of gnathopod 



2 is slightly longer in females of P. tenuis than in females of P. pusilla. 

 P. pusilla has been taken from mangrove roots, sea grass, hydroids, 



and ascidians. 



A lectotype has been designated from the syntypical series which 

 is deposited in the Copenhagen Museum. 



Paracaprella tenuis Mayer, 1903 



FiGTJEEs 43, 44, 53 



Paracaprella tenuis Mayer, 1903, p. 68, pi. 2, figs. 34-35, pi. 7, figs. 51, 58. — M. 



Rathbun, 1905, pp. 7, 77.— Sumner, Osburn, and Cole, 1911 (1913), 



p. 657.— McCain, 1965, pp. 192-193, figs. Id-e, 2g-K. 

 Paracaprella simplex Mayer, 1903, p. 68, pi. 2, figs. 38-39, pi. 7, figs. 53-57.— 



Cowles, 1930, p. 351.— Ferguson and Jones, 1949, p. 442. 

 Deutella abracadabra Steinberg and Dougherty, 1957, pp. 277-279, figs. 14, 17, 



18, 20, 27. 



Diagnosis. — Males with small triangular projection on antero- 

 lateral margin of pereonite 2; basis of gnathopod 2 not expanded and 

 without proximal knob; propodus with large nonrounded notch at 

 midlength. 



Description. — Body smooth on dorsal surface, anterolateral margin 

 of pereonite 2 with small rounded projection, pleura on pereonite 3 

 generally well developed, pleura on pereonite 4 present but usually 

 weakly developed. Length of largest male 7 mm, largest female 5 

 mm, smallest ovigerous female 3 mm. 



Antenna 1 approximately length of pereonites 1-3; fiagellum of 

 males with 7-10 articles, females with 5-8. Antenna 2 slightly shorter 

 than peduncle of antenna 1, both antennae with numerous short setae. 



Mandibular palp 0- to 3-segmented, terminal article of palp usually 

 with 1 seta. Mandibles as in P. pusilla. Maxilla 1 as in P. pusilla 

 except outer lobe with 5 or 6 spines. Outer lobe of maxilliped with 1 

 or 2 apical setae, inner margin with numerous setae; inner lobe 

 apically rounded with 4-6 apical setae; penultimate article of palp 

 with process, terminal article with several setae at tip. 



Propodus of gnathopod 1 with 1 proximal grasping spine, grasping 

 margin of dactylus and propodus serrate. Propodus of gnathopod 2 

 similar to P. pusilla but notch at midlength more triangular and 

 deeper in large males than in P. pusilla, dactylus usually tapered 

 but occasionally similar to P. pusilla. 



Gills subovate. 



Pereopods 3 and 4, 2-segmented, terminal article small with 2 or 



3 setae, basal article with 1 or 2 setae. Propodus of pereopods 5-7 



