204 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



of an angel fish, James Bay, San Sebastian Island, Galapagos Islands, 

 March 3, 1926. 



Technical description: Head deeply inserted, the apex of the 

 anterolateral angle reaching slightly farther forward than the anterior 

 angle of the eye ; head with the anterolateral margins rounded, median 

 rostral point prominent ; posterior margin relatively straight ; length 

 in the median line equal to seven-eighths of the greatest width ; eyes 

 median lateral, subovate, black. Inner antennae, consisting of six 

 articles, stockier than the outer antennae, extending back as far as 

 midway the eye. External antennae, consisting of seven articles, 

 extending slightly beyond the first antennae. 



Thorax: The first thoracic segment is 2 mm. long in the median 

 line, or 0.5 mm. shorter than the head, and has the anterolateral angles 

 produced and closely applied to the head for a distance equal to half 

 the length of the head, outer margin of angles convex. Second, third 

 and fourth thoracic segments similar and subequal in length, each 

 being two-thirds as long as the first thoracic segment is in the median 

 line; the fifth thoracic segment is similar to but only two-thirds as 

 long as the fourth; the sixth segment is two-thirds as long as the 

 fifth and has the median posterior margin concavely excavate for the 

 reception of the abdomen. 



The epimera are nearly as long as the related segments, narrow, 

 with the postlateral angle rounded. The epimera of the fourth seg- 

 ment is not quite as long in proportion to its segment as that of the 

 third segment and is more acuminate posteriorly. There is also a 

 nearly median incision in the lateral margin of the fourth segment 

 and the hinder half of the margin is rounded ; the fifth and sixth seg- 

 ments are similarly notched and their lateral margins are even more 

 rounded; the lateral margin of the seventh segment is incised nearer 

 its posterior angle, the hinder lobe being much smaller than the 

 anterior one. The epimera of the fifth, sixth and seventh segments 

 are successively shorter and are rounded posteriorly. 



Abdomen: The first abdominal segment is crescentic, much nar- 

 rower than the others; the second to fifth segments, inclusive, are 

 approximately equal and closely fused with the distal margins bluntly 

 rounded. The telson is wider than long, with the postlateral margin 

 broadly rounded. The uropoda are slender and closely appressed to 

 the telsonic margin ; when extended, the blades exceed the length of 

 the telson by almost the distal half of their length. The peduncle is 

 three-fourths as long as the blade and much wider, the inner blade 



