ATLANTIC AND CARIBBEAN PYCNOGONIDA—HEDGPETH 249 
short, propodus slightly curved, with four large, straight, widely 
separated basal spines. Auxiliary claw about three-fourths as long 
as terminal claw. 
Measurements.—As follows: 
Mm | Third leg: Mm 
Brobos cise Siqucas ebearhs 22. ca. 0. 75 MTSE COKA = 44 eh. saa 0. 2 
PPrunks dee st ethan soe8 Va Bie. t, 0. 75 Second! coxas.. 225. =... 0.3 
Second lateral process, width_-_- 0. 75 Meri fs Ite) ¢:' Mempmem nea Mee 2 2k EPCS 0. 25 
Chelfere. oe alae’ 0. 7 GIN T ete che oes St ol Re 0. 75 
Aibdoment #42 cep tad | rela 0. 6 Pirststiblar aches forte ee 0.9 
Second ttibialies =t2l5- estes 1.0 
TSrsuss,.- 2 bo lee 9s Se 2 0. 08 
Propodusite rte ent ewctlie 0. 4 
Terminal claw. 2225. 2 0. 2 
Auxiliary claw 226 2222 2t ume 0. 18 
Remarks.—This species is smaller than A. rugulosa, is more spiny 
in appearance, and has lateral spurs on the first coxae and lateral 
processes. The barbed spines on the chelifore and, sparingly, on the 
coxae, femur and first tibia should distinguish A. marcusi from other 
species in the genus, but they are not easy to see in such a small 
animal. Also of specific importance are the serrated tubercle over 
the insertion of the palpus and the long, spinelike femoral cement 
gland tube. 
This species is dedicated to Dr. Ernesto Marcus, of the Departa- 
mento de Zoologia of the Universidade de Sao Paulo, Brazil, in recog- 
nition of his excellent work with South American pycnogonids and in 
commemoration of a delightful correspondence. 
Genus NYMPHOPSIS Haswell, 1884 
Nymphopsis WILLIAMS, 1933, pp. 173-180. 
Chelifores 2- or 3-jointed, achelate; scape usually trumpet-shaped. 
Palpi 9-jointed. Ovigers 10-jointed. Legs rather heavy, armored in 
most species, with large compound spines and spiny tubercles, pro- 
podus well developed. 
This genus is represented in the Caribbean region by two species, 
Nymphopsis anarthra and N. duodorsospinosa. Since Williams drew 
up a key to the genus, three more species have been referred to it, 
and the following key is based on a somewhat different series of char- 
acters: 
i cane OF chcimores t-jointed tence 2 Ain oe cel pt age oetes i dag 2 
SECC EPA Ts ih os |E  e, Sa OA OOe ccm are ie NSE an er eee J 3 
2. Dorsal trunk tubercles small, shorter than eye tubercle (Queensland). 
armata Haswell (1884) 
Dorsal trunk tubercles taller than eye tubercle (Venezuela) __anarthra (p. 250) 
ep ST RCT Ole EPR ON Gen 5 pe 4 
Without dorsal trunk tubercles (Timor)__-_korotnewi Sehimkewitsch (1888) 
