CAPRELLIDAE OF WESTERN NORTH ATLANTIC 83 



lenbcrg, 1928, pp. 677-678, 1939, pp. 136-137.— Edmondson and Mansfield, 

 1948, pp. 208-209, fig. 4.— Barnard, 1955, p. 99— Day and Morgan, 1956, 

 p. 303.— Steinberg and Dougherty, 1957, pp. 283-284, figs. 16, 19, 24, 30.— 

 McCain, 1965, p. 193. 

 Caprella nigra Reid, 1951, pp. 283-284, 289, fig. 58. 



Diagnosis. — Males with large triangular projection on antero- 

 ventral margin of pereonite 2; basis of gnathopod 2 short and ex- 

 panded with proximal knob on posterior margin, propodus with 

 shallow rounded notch at midlength. 



Description. — Male lectotype: Body smooth on dorsal surface; 

 anter(jventral margin of pereonite 2 with large triangular projection; 

 pleura developed on pereonites 3 and 4, weaker on pereonite 4. 

 Length 3.5 mm. 



Peduncle of antenna 1 setose, usually longer than antenna 2. 

 Antenna 2 without swimming setae but densely setose. 



l^slandibular palp not present, probably represented by single seta. 

 Left mandible Avith 5-toothed incisor, 5-toothed lacinia mobihs, setal 

 row of 3 serrate setae. Eight mandible with 5-toothed incisor, apically 

 serrate lacinia mobilis, setal row of 2 serrate setae. Palp of maxilla 1 

 with 3 apical spines and 1 lateral seta, outer lobe with 6 apical spines. 

 Outer and inner lobes of maxilla 2 with 4 apical setae. Maxilliped 

 missing. 



Propodus of gnathopod 1 with 1 proximal grasping spine, grasping 

 margin of dactylus and propodus serrate. Basis of gnathopod 2 

 shorter than propodus, expanded with distal knob on posterior 

 margin; propodus with proximal grasping spine and notch at mid- 

 length with slightly proximal tooth; dactylus with proximal and 

 distal knobs bearing numerous setae between knobs. 

 Gills missing. 



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

 setae. Pereopods 5-7 missing. 



Abdomen with pair of appendages and pair of setose lobes, ap- 

 pendages with setae at base and on tip. 



Female: Body smooth except for small projection on anteroventral 

 margin of pereonite 2 and pleura only slightly developed. Length of 

 largest female 5 mm, smallest ovigerous female 4 mm. 



Antennae and mouthparts similar to male, maxilliped as in P. 

 tenuis. 



Gnathopod 1 similar to male. Basis of gnatliopod 2 short but not 

 expanded and A\itliout i)roxinuil knob as in male; propodus similar 

 to male except without notch. 



Gills subovate. 



Pereo])ods 3 and 4 as in male. Propodus of pereopods 5-7 with 

 pair of proximal grasping spines, pereopod 5 much smaller than 

 pereopods 6 and 7. 



