1911] Esterly:Copepodaofth< San Diego Region. 329 



The anterior antennae reach back to the posterior border of 

 the genital segment; the anterior maxillipeds have eight vermi- 

 form sensory appendages. The fifth feet are phyllous, 2-jointed, 

 and the distal joint lias three spines (pi. 31, fig. 101). 



Length: 3.14 mm. 



Coloration: Opaque white in formalin. 



Occurrence: Station 1527, vertical from 500 f., sounding 640 1'., July 

 11, 1908. 



The shape of the head and thorax will serve to distinguish 



this species sharply from others. 



Family < HXTROPAGIDAE. 



Genus Pleuromamma Giesbrecht. 



Pleuromamma quadrungulata Dahl. 



PI. 30, fig. 65; pi. 32, fig. 111. 



Pleuromma quadrungulata, Dahl (1893), p. 105. 

 Pleuromamma quadrungulata, Giesbrecht (1898), p. 109. 



Those forms occur in the same hauls with P. abdominalis and 

 /'. xiphias commonly, and occasionally with P. gracilis. They are 

 easily recognized by the four heavy, curved hooks on the anterior 

 antennae (pi. 30, fig. 65). There are two hooks on the first joint, 

 one on the second and one on the fourth: in /'. abdominalis 

 there is but one hooked spine and that is on the basal joint. The 

 pigment knob in /'. quadrungulata seems to be always on the 

 right side. The sexes are alike in the spines of the anterior 

 antennae, and the abdomen of the male is symmetrical. The 

 fifth feet of the male are shown in pi. 32, fig. 111. 



Length: Female, 3.48 mm.; male, 3.55 mm. 



Coloration: Whitish in formalin, with a characteristic pink fleck in the 

 mouth. 



Occurrence: Rather common in all the deeper hauls, as station 1528, 

 vertical from 500 f., sounding 640 f., duly 2, 1908; none taken above 170 f. 



Genus Augaptilus Giesbrecht. 

 Augaptilus lamellifer n. sp. 



PI. 26, fig. 8; pi. 28, fig. 36. 

 Adult female. The head and last thoracic segments are 

 rounded (pi. '26, tig. 8); the rostral filaments are slender but 



