112 Carl Bovallius, The Oxycephalids. 



The dactylus of the first two pairs of jjerœopoda is half as 



long as the metacarpus. The whole seventh pair are not 



half as long as the femur of the sixth. 

 The lateral parts of the first two pleonal segments are square 



behind, not produced; that of the third segment is produced 



behind into a long, spinous process. 



Syn. 1877. Leptocotis spinifera, Th. Streets. 24, p. 137. 



» » » 1878. 26, p. 283, pi. 2, fig. 4. 



From the first description of the species published in 1877 I give 

 the following passages: 



»Head long, with the rostrum longer than the thorax; vertical 

 diameter of the head greater posteriorly than anteriorly; the superior 

 surface on a higher level than the dorsum of the thorax; abruptly con- 

 stricted behind the eyes and in front of the first thoracic segment; the 

 inferior border slightly convex; the under surface hollowed out on each 

 side anteriorly in the form of fossee for the reception of the superior 

 antennae; supra-fossal margin arched and slightly elevated ; rostrum long, 

 acute, slightly arched. . Thorax seven-jointed; segments increa- 

 sing in length posteriorly; epiraerals long, broadly ovate, transversely 

 rugose. Gnathopoda short chelate; the second pair longer than the first; 

 carpus of first pair scarcely produced anteriorly, and inferiorly serrated; 

 propodos broad, serrated on inferior margin; dactylus half the length of 

 the propodos, arched, with a minute spine about the middle of the in- 

 ferior surface, antagonizing with the extremity of the carpus. Second 

 pair having the carpus more produced anteriorly than the first, extending 

 to, or slightly beyond, the apex of the propodos, and terminating in a 



long fine point; propodos and dactylus similar to the first pair. 



Fifth pair rudimentary, coxa dilated, small, with the remaining joints not 



half as long as the coxa of the preceding pair. Caudal 



appendages long, cylindrical, serrated along their inner margins, bira- 

 mous; outer pair longer than the two following; ultimate short, reaching 

 further than the inner. Telson long, cylindrical, extending beyond the 

 extremities of the lamellae». 



From his later description in 1878 the following may be added: 



»Head long, excluding the rostrum, as long as the thorax; 



rostrum slightl}^ more than one-third the length of the head (including 

 its own length,) slender, acute, sligthtly arched. The second 



