ATLANTIC AND CARIBBEAN PYCNOGONIDA—HEDGPETH 217 
This is one of the commonest littoral pycnogonids of the New England 
coast north of Cape Cod.and is sparingly found as far south as Long 
Island Sound. It is found also on the coast of Europe from Norway 
to France, Iceland, Greenland, and on the Pacific coast of North 
America as far south as the Los Angeles region, but it has not been 
reported from Japan. The bathymetric range in the New England 
region is from shore line to 55 fathoms. According to Lebour, this 
species lives principally on Syncoryne. This author has proposed 
(1945, pp. 147-150) another species, P. tubulariae, which is smaller 
and has a longer abdomen and a somewhat different armature of spines 
on the propodus. The larvae are found in the gastral cavity of 
Tubularia. The anatomical characters of this species, with the 
exception of the longer abdomen, agree with Wilson’s (1878b) P. 
minor, which he subsequently (1880) reduced to synonymy under 
P. mazillare. His figures of the tarsus of this smaller variety agree 
very much with Lebour’s figure (2b) of the tarsus of her P. tubulariae. 
It would appear that P. minor is an intermediate form between 
femoratum and tubulariae and that it would be very difficult to keep 
these species apart, although they may represent bona fide geographic 
races. Lebour’s form should probably be considered a variety rather 
than a full species. Obviously this species requires further study, 
based on a large series of specimens. 
Genus HALOSOMA Cole, 1904 
Halosoma Cour, 1904a, p. 286; Hitron, 1915, p. 69; Marcus, 1940b, pp. 43-46. 
Chelifores 2-jointed, with small chelae. Palpi lacking. Oviger 5- 
or 6-jointed. The trunk is compact, shield-shaped or circular, and 
with no conspicuous neck. There are minute auxiliary claws. 
This genus was established by Cole (1904a, p. 286) on a single female 
specimen. The oviger of the genotype, Halosoma viridintestinale, has 
not been figured previously (fig. 25, a). Hilton was in error in de- 
217m 
x 
S 
CaN , 
ey 
Ficure 25.—Halosoma viridintestinale Cole: a, Oviger; b, femoral cement gland. 
