CERATOMYSIS SPINOSA. 229 



which appear to be of a soft consistency, suggesting a tactile office ; no visual 

 elements are discernible. The first antennas consist of a short three-jointed 

 stalk, which bears two flattened and ciliate flagella, the inner one a little 

 longer than the outer; the whole antennule is as long as the carapace. 

 The antenna! scale is linear, ciliated on both margins ; the flagellum sur- 

 passes the antennular flagella. The mandibular palpi overreach the an- 

 tennular peduncles by the length of their terminal segment, which is long, 

 oval, and somewhat expanded ; the margins of the segments of the mandib- 

 ular palpi are prettily fringed with delicate setas. The second, third, and 

 fourth pairs of legs are very slender, the hinder three pairs being more 

 robust and very long; the antepenultmiaie pair are the longest of all, 

 reaching forward nearly to the end of the antennal scale ; the dactyli of 

 the last three pairs are long and rather straight. 



The marsupial pouch of the female is composed of seven pairs of lamellae. 



The abdominal limbs (in the feujale) are siniple, except the left one of 

 the fifth pair, which bears a slender lateral branch ; the first pair is the 

 smallest ; the fourth and fifth pair are considerably elongated, the fifth to 

 the greatest degree, reaching backward beyond the distal end of the basal 

 segment of the uropods. The two branches of the uropods are linear, of 

 nearly the same length, shorter than the telson ; the outer branch is not 

 divided by a transverse joint; it is ciliate on both sides, the outer margin 

 being furnished, besides, with a few stouter setae. 



Length, 36 mm. ; carapace, 9 mm. 



Color in life, milk-white. 



Of this curious Schizopod a single specimen, a female, was taken at 

 Station 3357 in 782 fathoms; bottom, green sand; temperature, 38° F. 



