246 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
long as propodus, auxiliary claws nearly four-fifths as long as terminal 
claw. 
Measurements.—As follows: 
Mm. | Third leg: Mm. 
‘Proboscis et. 26. sae AINE aie 0. 9 irsticoxal Ws Yuen Lanta 0. 4 
Cephalic segment______________ 0.5 Secondcoma ck hi eu. 0.9 
oe Ay hay cs oat SDE ne cle ae mr re eS Third*coxayhowwa 8.2 ton Fergie 0. 5 
Abdomen= cei sec. es epee ee 0.5 Hemiun. = Agsds Petia e teayahs 1. 98 
Hirst tibial © aappete ee 252 
Second tibia__.-____.____- PEt 
arsus-Ce 8 waves EA 0. 1 
Propadise 4 Ve Carer ae tat 
Terminal claw. 25¢525232 0. 5 
Auxiliary claw. 25 21-2 es 0. 4 
Remarks.—This species is distinct from the fifty-odd other members 
of the genus because of its widely separated lateral processes. Denticu- 
late spines could not be made out on the spines of the terminal seg- 
ments of the oviger but may be present in the male, which is still 
unknown. It is evidently a deep-water (400 fathoms) species; most 
of the species of Achelia are littoral. Hilton (1943a, p. 96) gives a 
preliminary diagnosis for a species (Ammothea elongata) with an 
“elongate’”’ body and slender legs with spines, from the North Pacific 
at 695 fathoms. 
Genus AMMOTHELLA Verrill, 1900 
Ammothella Marcus, 1940b, pp. 88-89. 
Chelifores 3-jointed, achelate in adult. Palpi 9-jointed. Oviger 
9-jointed, with denticulate spines on terminal segments. Legs long, 
slender, propodus well developed, with basal spines. 
According to Marcus, who has examined specimens and larval 
stages, Ammothella appendiculata and A. rugulosa are distinct species. 
The adults differ principally in the distribution of club-shaped spines. 
In rugulosa these spines are found on the basal joint of the scape of 
the chelifore and usually on the anterior edge of the cephalic segment 
over the insertion of the palpus. These club-shaped spines are never 
found on the basal segment of the chelifore in appendiculata or on 
the lateral processes. These relatively minor differences are sup- 
ported by differences in the Protonymphon larva: the larva of appen- 
diculata is larger and the fingers of the chelae are longer in proportion 
to the palm than those of rugulosa. 
Ammothella appendiculata (Dohrn) occurs in the Mediterranean 
and at Rio de Janeiro, Brazil. It is not represented in the museum 
collections from North American waters. 
1. Without barbed, plumed spines on chelifores; lateral processes and first coxae 
wathoud lateral spurs) (ois a8 ee es he ot ce a a 2 
Barbed spines resembling minute feathers on chelifores; lateral processes and 
first coxae with lateral spurs___...........--- marcusi, new species (p. 247) 
