REPORT ON THE CRUSTACEA MACRURA. 529 



Athanas velocidus, n. sp. (PI. XCVL fig. 1). 



Eostrum reaching nearly to the extremity of the peduncle of the first pair of 

 antenna?. 



Ophthalmopoda almost hidden beneath the anterior margin of the carapace. 



First pair of antenna? furnished with a long stylocerite, and supporting two flagella, of 

 which the upper is unequally bifid. Scaphocerite of the second pair of antennae reaching 

 to the extremity of the rostrum. 



Second gnathopod reaching beyond the scaphocerite. 



Length, entire, ...... 7 mm. (0'27 in.). 



„ of carapace, . . . . . 2 ,, 



„ of pleon, . . . . . . 5 ,, 



Habitat. — Cape Verde Islands. Two specimens. 



This species bears a resemblance to Athanas nitiscens, Leach, the type of the genus, 

 but differs in having the ophthalmopoda covered to a greater extent by the orbital 

 margin of the carapace, a portion of the ophthalmus alone being visible. Above the eye 

 on the inner side of the orbit there is a small sharp tooth, which does not exist in 

 Athanas nitiscens, and the outer canthus is also produced to a strong tooth, external 

 to which the frontal margin is produced and armed with a sharp tooth both above and 

 below the first antenna?, and the frontodateral angle is rounded. 



Both pairs of antenna? correspond with those of Athanas nitiscens, or differ only in 

 points of specific value. The oral appendages have not been examined in this species,, 

 but the second pair of gnathopoda is relatively longer than that represented in Leach's 

 fisure of Athanas nitiscens. 



The first pair of pereiopoda is wanting in our specimens. The second is slender and 

 has the carpos multiarticulate, but comparatively longer than in Athanas nitiscens. The 

 three posterior pairs are simple and similar in form ; the carpos is short, the propodos 

 long, cylindrical, and fringed with hairs on the posterior margin ; the dactylos is short 

 and unguiculate. 



The pleopoda are biramose and foliaceous, and the lateral plates of the rhipidura are 

 longer than the telson. The outer plate is furnished with a well marked dia?resis, 

 the outer margin of which is defined by a small tooth, beyond which the outer plate as 

 well as the inner is fringed with hairs. The telson is tapering, dorsally armed on each 

 side with three single spinules and terminally fringed with small hairs. 



Observations. — Although the infraorbital tooth is of generic rather than specific value, 

 I do not consider myself justified in separating this species from Athanas until more and 

 better specimens have been examined. 



(ZOOL. CHALL. EXP. — PAET III. 1887.) Fff 67 



