GAMMARIDAE 



213 



angle quadrate with a small sharp point. Telson longer than wide, cleft nearly half-way, 

 lobes dehiscent, each apically notched, with a setule in the notch, the inner point 

 slightly longer than the outer point. 



Antenna 1 (S) extending to end of 1st pleon segment, 1st and 2nd joints subequal, 

 3rd one-third length of 2nd, flagellum rather shorter than peduncle, 32-jointed, 

 accessory flagellum 12-jointed. Antenna 2 shorter and more slender than antenna 1, 

 5th joint shorter than 4th, flagellum subequal to 5th peduncular joint, 12-14-jointed. 

 Mouth-parts normal. 



Fig. 131. Maera pfefferi, n.sp. a. Side-plate 1 and gnathopod 1. b. Gnathopod 2 $. 

 c. 2nd joint of peraeopod 5. d. Left uropod 3 rj, dorsal view. 



Gnathopod 1, 5th joint subequal to 2nd, its upper apex produced as a short point 

 overhanging base of 6th, in the juvenile as well as the adult, 6th shorter than 5th, ovate- 

 triangular, palm somewhat oblique, with rounded defining angle and no spine, palmar 

 margin spinulose, lower margins of 5th and 6th joints densely setose, and outer surfaces 

 with several fascicles of setae arranged in rows. No sexual differences. 



Gnathopod 2, 6th joint broadly ovate, hind margin with fascicles of short setae, 

 rather longer than palm which is slightly oblique, defined by a strong, apically bifid 

 tooth, two teeth near hinge, with a semicircular notch between them, margin between 

 lower tooth and defining angle crenulate, a spinule in each notch. No sexual differences, 

 except that in the $ the tooth nearest the hinge is broader and stronger. In the no. 1 ^ 

 the right hand is slightly larger than the left. In no. 1 juv. the palm is entire or only 

 faintly crenulate. 



