Crangon and Galathea. 79 



Rostrum long, broad, its apex dilated, the anterior angles produced, so that 

 it becomes bifid, much longer than eyes, which it partially conceals ; orbits 

 narrower than ^g. fasciaius, the external angle somewhat rounded, much 

 shorter than rostrum, the entire orbit closely fringed with long ciliaj, which 

 nearly conceal the eyes ; eye-stalks very short. 



Carapace broad, somewhat flattened superiorly, roughened with denticulated 

 carinse as follows : one on median gastric region, terminating in a well-marked 

 tooth ; one bounding each lateral gastric region, likewise terminating in a tooth 

 on a line posterior to median gastric tooth, the series bifurcating posteriorly ; 

 the space between the lateral gastric and median gastric carina3 is armed in 

 each posterior half by a bifurcating toothed carina, the anterior half being 

 smooth. Each branchial region bears one principal carina, terminating in a 

 well-marked tooth, on a line slightly in advance of the median gastric tooth, 

 beneath which, inferiorly, is a curved similar line, imperfectly marked, and 

 continuous with the produced angle of the carapace external to the outer an- 

 tenna3. 



The first pair of chelipeds are moderately long ; the propodos with its sides 

 parallel, elongate, the palm oblique, the dactylos long, slender, curved, and spi- 

 niform ; the carpus smooth. The second pair of chelipeds are scarcely one- 

 half the length of the first, moderately stout, the propodos and dactylos very 

 short. The third and fourth are very slender, as long as the first pair ; the 

 fifth stout and long. 



The external maxillipeds attain the end of the antennal scale; their terminal 

 joint is elongate and triangular. 



The external antennae are moderately long, their scale narrow, curved, and 

 much longer than the pedimcle; the internal antennte are likewise long; hypo- 

 sternal tooth short, triangular. 



The abdomen is highly sculptured, the raised portions smooth, the depres- 

 sions slightly pubescent ; the third, fourth, and fifth somites are sculptured, and 

 longitudinally carinated ; the sixth sculptured, bicarinate (the carinas smooth), 

 and sulcate ; the telson is elongate, triangular, deeply and distinctly sulcate ; 

 the posterior pleopods and their accessory plates are narrow. A row of teeth 

 on hyposternal region. 



Colour varies much, no two specimens being alike ; shades of plain drab, 



M 2 



