188 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Remarks: Euceramus forms a transition between the group of 

 genera in which the basal antennal segment is short and not broadly 

 in contact with the anterior margin of the carapace, and the group of 

 genera in which the basal segment is strongly produced forward so that 

 the movable segments are far removed from the orbit. \n E. panate- 

 lus the basal segment is not produced forward; in both E. praelongus 

 and E. transversilineatus it has a small forward projection which nar- 

 rowly separates the movable segments from the orbit. 



Key TO THE Eastern Pacific Species 

 la. Carapace a little over twice as long as broad; flagellum much 

 longer than carapace, with long plumose hairs . . panatelus 

 lb. Carapace about one and a half times as long as broad; flagel- 

 lum shorter than carapace, not hairy . . . transversilineatus 



Euceramus panatelus Glassell 

 Plate 36, fig. 1; text-fig. 7(1) 



Euceramus panatelus Glassell, 1938a, p. 423, pi. 29 (type locality. La 

 Libertad, Ecuador). 



Previous records: 

 Mexico. Bahia Tenacatita; Isla Grande: W. Williams on Stranger 



(Glassell). 

 Guatemala. San Jose: W. Williams on Stranger (Glassell). 

 Ecuador. La Libertad: W. Williams on Stranger (Glassell). 



Diagnosis: Carapace a little over twice as long as broad, lightly 

 plicate; basal segment of antenna very short, without inward or for- 

 ward projections ; flagellum much longer than carapace, with long plu- 

 mose hairs; dactylus of walking leg 3 flat, without a nail. 



Description: Carapace a little over twice as long as broad, covered 

 with light transverse plications; small flattened granules on frontal and 

 hepatic regions; cervical groove well marked, but regions not distinct; 

 devoid of pubescence. Front divided into three small pointed teeth, 

 about equal in breadth; also equal in length, or median one a little 

 longer. Hepatic spine small, epibranchial spine small but distinct; these 

 spines separated by a shallow notch. 



Basal segment of antenna very short, not produced either forward 

 or inward ; first and second movable segments massive, much broader 

 than eyestalk; third very short; flagellum much longer than carapace, 

 thickly covered with long plumose hairs. Outer maxillipeds punctate, 



