50 Rev. T. R. R. Stebbing on a 



points to the close relationship which this genus bears to 

 Leptochelia. It is, in fact, inosculant between Leptochelia^ 

 Dana, and Heterotanais , Sars. The latter is distinguished 

 from the former by two characters, its subchelate fii'st gnatho- 

 pods and its uropods with a two-jointed outer branch. In the 

 second of these characters it agrees with DoUcJiochelia, from 

 which it is strongly distinguished in regard to the gnatho- 

 pods. To have had to separate DoUchochelia from Leplo- 

 cAeZi'a merely on the ground that the minute outer branch of 

 the uropods is two-jointed in the one and uniarticulate in the 

 other, might have been necessary, but would have been a 

 hard necessity. The new West- Indian genus, however, is 

 fortunately not dependent solely on so small a difference, 

 being strikingly separated from both the nearly related genera 

 by the slenderly elongated first antennae and first gnathopods. 



DoUchochelia Forresti, sp. n. 



The front margin of the head-shield projects but sliglitly, 

 forming a very obtuse angle, the corners being shallowly 

 excavate for the ocular lobes. The part of the shield to 

 which the first gnathopods (or chelipeds) are attached is wider 

 than the front. The pleon at its base is as wide as the trunk, 

 but narrows distally with a gentle curve ; the sixth segment, 

 which is very little longer than that preceding it, ends in an 

 obtuse angle similar to that of the frontal margin. 



The eye-lobes have a convex outer margin and are not very 

 sharply pointed in front. The pigment is black in the 

 mounted specimen. 



First Antennce. — These are as long as the animal from the 

 front of the head to the apex of the pleon. The first joint is 

 dilated at the base, for the rest slender, its length forming 

 two fifths of the whole antenna. The second joint is rather 

 less than three quarters the length of the first. The third is 

 a fifth of tlie length of the second, and so slender as to look 

 like a part of the flagellum, among the eight joints of which 

 the first is the shortest. The joints carry two or three setae 

 apiece, giving an appearance very unlike that produced by 

 the conspicuous sensory filaments in the adult males of 

 Leptochelia and Ileterotanais. 



Second Antennce. — The first three joints are very small, 

 together not equal to the fourth. The fifth is two thirds the 

 length of the fourth and is distally armed with a seta. The 

 minute tubercle which represents the flagellum carries two 

 seta3. The whole antenna is shorter than the flagellum in 

 the first pair. 



