THE FOSSIL STALK-EYED CRUSTACEA 73 



Areolation of carapace: Mesogastric region small, the narrow 

 portion almost linear posteriorly, widening a little anteriorly and 

 terminating in a pointed furrow which is continued by a narrow 

 sulcus leading to the edge of the front. From in front of the inner 

 angle of the branchial region a blunt transversely arched ridge runs 

 to the lateral spine. Behind and a little outside its origin a longi- 

 tudinal ridge extends backward and a little outward, stopping short 

 of the posterior margin. A conical tubercle at inner angle of 

 branchial region. On either side of the cardiac-intestinal constric- 

 tion a crescentic elevation concave outward. A row of about seven 

 very irregular tubercles lies in front of and parallel to the trans- 

 verse branchial ridge. A transverse blunt ridge across the protogas- 

 tric lobes. Epigastric lobes elevated and also the hepatic. 



Ventral aspect : The ischium of the outer maxillipeds has a deep, 

 slightly oblique furrow; the merus is produced at its outer angle, 

 the surface is uneven, inner angle notched; exognath reaching 

 antero-external angle of merus. Abdomen of male with fourth to 

 seventh segments together triangular; third segment narrowing at 

 either end to a blunt tip. 



Chelipeds and legs : Of moderate length ; merus extending but lit- 

 tle beyond carapace (pi. 18, fig. 4) ; carpus squarish in dorsal aspect, 

 the distance from the merus to the opposite side less than the length 

 in the other direction. Chela short in relation to height; palm 

 thick, upper and lower surfaces rounded, outer surface with a broad 

 blunt longitudinal ridge; upper distal angle rectangular; dactylus 

 articulated below top of palm. Both fingers broad, not gaping, the 

 fixed finger broader at base than the dactylus. 



Following is a description of chela, N. Pac. 253 (pi. 22. fig. 3), sup- 

 posed to belong to this species : Only the surface of the distal end of 

 the manus and of the fingers is visible. Surface finely and evenlj' 

 granulate; distant, scattered punctae larger than the granules; a 

 row of punctae along the base of the prehensile teeth. Fingers long, 

 gradually diminishing, deflexed; a deep groove on less than the 

 distal half of fixed finger, and a shallow groove about as long next 

 to the teeth; two very shallow grooves on dactylus; prehensile 

 edges irregularly dentate, four teeth larger and more prominent 

 than the others and separated by from two to four smaller teeth. 

 The large teeth of one finger fit in to the intervals between the large 

 teeth of the other finger, so that there is little or no gape. Outer sur- 

 face of palm bending strongly over to the upper surface ; there is no 

 further evidence of carination on the short length of palm visible. 



The ambulatory legs are slender. The last or swimming foot is 

 preserved in only two cases; the propodus is narrow, the dactjdus 

 suboval. 



