CAPRELLIDAE OF WESTERN NORTH ATLANTIC 73 



molar present; outer lobe of maxilliped larger than inner lobe; gills 

 on pereonites 3 and 4; pereopods 3 and 4, 2-segmented, pereopod 

 5, 2- or 3-segmented; abdomen of male with pair of uniarticulate 

 appendages and pair of lobes, female with pan* of lobes. 



Type-species: Mayerella limicola Huntsman, 1915 (by monotypy). 



Remarks. — -This genus is now composed of 2 species, M. limicola 



and M. rednnca n. sp. The number of articles in pereopod 5 of the 



new species varies from 2 to 3 and the generic definition has been 



altered to include this variation. 



Mayerella limicola Huntsman, 1915 



Figures 3G, 50 



Mayerella limicola Huntsman, 1915, pp. 39-42, pis. 5-6.— Procter, 1933, p. 256. 



Diagnosis. — Abdominal appendage of male approximately length 

 of penes; propodus of gnathopod 2 with proximal grasping spine and 

 notch at midlength. 



Description. — Body smooth. Length of largest male 7 mm, no 

 females examined. 



Peduncle of antenna 1 approximately length of pereonite 3. Antenna 

 2 somewhat longer than peduncle of antenna 1. 



Mandibular palp 3-segmented, setal formula for terminal article 1. 

 Left mandible with 5-toothed incisor, 5-toothed lacinia mobilis, setal 

 row of 3 serrate setae. Right mandible with 5-toothed incisor, lacinia 

 mobilis toothed but not distinctly 5-toothed, setal row of 2 serrate 

 setae, molar present. Outer lobe of labium winglike, more robust 

 than in most species of Caprella. Palp of maxilla 1 with 4 apical spines, 



1 medial seta; outer lobe with 7 apical spines. Outer lobe of maxilla 



2 with 7 apical setae, inner lobe with 5 apical setae. Outer lobe of 

 maxilliped with 1 apical seta, 1 middistal seta set in notch, and 

 several setae on anterior surface; inner lobe with 4 apical setae; 

 dactylus of palp serrate on grasping margin. 



Propodus of gnathopod 1 triangular with 1 proximal grasping 

 spine, grasping margin of propodus and dactylus serrate. Propodus 

 of gnathopod 2 with i)roximal grasping spine and notch at midlength. 



Gills small, elliptical. 



Pereoi)ods 3 and 4, 2-segmented, terminal article with 1 or 2 setae. 

 Pereopod 5, 3-segmented, terminal article with 3 or 4 short setae. 

 Pereopods 6 and 7, 6-segmented, i)ropodus with numerous setae on 

 palmar margin and occasionally with 1 grasping spine, dactylus 

 slender and tapering. 



Abdomen of male with i)air of uniarticulate appendages of ap- 

 proximately length of penes and pair of lobes, ])enes medial. 



Variation. — The males varied in the presence or absence of the 

 single grasping spine on pereopods G and 7. The number of setae on 



