236 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



fin ray. Distal end of second antenna degenerate in adult, appearing 

 to have been clawlike in younger stages (fig. 24^'). 



Mouth cone conical, protruding from median ventral surface of 

 cephalon, distal surface slightly constricted, with membranous margin 

 flaring outward from distal margin of cone (fig. 24A). 



Mandible visible as elongate, acuminate process ciu"ving inward 

 distally. Divisions not visible (fig. 24h). 



Maxilla two-segmented, attached lateral to mouth cone. First 

 segment slightly more than four times length of second, gibbous, with 

 distal sm'face concave. Second segment truncate, with two seta- 

 like projections from distal surface (fig. 24 i) • 



The modification of this species is such that the naming of the oral 

 appendages other tlian the mandibles is difficult. The above ap- 

 pendage is similar to the node on the anterior end of the postoral 

 process in many caligids. Because of the lack of a complete develop- 

 mental study and the lack of comparative studies with related groups, 

 the appendage is termed a maxilla with reservation. 



Maxilliped two-segmented, attached posterior to mouth cone. 

 Fhst segment approximately^ one and a half times length of second, 

 greatest width slightly less than half greatest length; small protrusion 

 on middle of inner sm-face. Second segment curving inward distally, 

 terminating in blunt, rounded tip (fig. 24j). 



In specimens preserved in alcohol, all of the thoracic legs possess a 

 reddish area in the middle of the protopodite; this area is indicated 

 on the figure of the appendage by stippling. 



First thoracic leg ovoid, platelike, attached to anterior lateral 

 sm-face of segment. Greatest width about two-thirds greatest length, 

 distinct protrusion on middle of anterior margin and distinct groove 

 extending from slight indentation on distal margin to proximal region 

 of appendage (fig. 24:k). 



Second thoracic leg one-segmented, of general ovoid shape, attached 

 to posterior lateral surface of segment; slightly larger than first 

 thoracic leg. Median groove present as in first thoracic leg, extend- 

 ing from slight indentation on posterior distal margin proximally to 

 proximal region of leg. Groove incompletely divides appendage into 

 two unequal parts, anterior larger than posterior (fig. 24/). 



Third thoracic leg ovoid, attached to posterior lateral surface of 

 segment; \vitliout median groove but with indentation of distal sur- 

 face. Third leg appears to consist of two lobate processes, smaller 

 of two fused to lateral surface of larger. Proximal surface projecting 

 slightly as tuberculate process, process attached to rod-shaped sternal 

 plate (fig. 24m). 



