PYCNOGONIDS 263 
longer. Ovigera relatively short, larger in the male than in the female; 
without terminal claw, but with a few denticulate spines (rarely absent, 
of. A. dohrni Thomson, ’84, p. 244). Legs usually rather short, and robust 
in the female; frequently spinous, usually more so in the male, especially 
on the basal joints; femoral joint very broad in female, the outer corner 
more or less projecting in both sexes; second tarsal joint strongly devel- 
oped, more or less curved, and with a few strong and several weaker 
spines on the inner margin; terminal claw strong; auxiliary claws usually 
well developed. Genital openings of female on second coxal joint of 
all 4 pairs of legs; those of the male at the apex of prominent projections 
on the corresponding joints of the third and fourth pairs of legs only. 
eemarks.—The genus Ammothea was first established by Leach to 
include certain forms having chelate chelifori; later Hodge gave the 
name Achelia to some very similar Pycnogonids, which had, however, 
rudimentary 2-jointed chelifori; but Dohrn (’81, p. 134) and others 
since have shown conclusively that Achelia represents merely the fully 
developed individuals of Ammothea. Dohrn believes that the following 
genera—Phanodemus Costa, Pephredo Goodsir, Pasithoé' Goodsir, Endeis 
Philippi, Paribea Philippi, Platychelus Costa, and Alcinous Costa—should 
also be considered as synonyms of this genus. 
It is possible that 4. dongicaudata Stimpson is identical with one of the 
species described here, and if so it is probably with A. Jatifrons. (See 
‘Remarks’ under that species, p. 266.) 
I have been unable to examine the description of 4. dorealis given by 
Schimkewitsch (’95) in a paper on the Pycnogonida of the White Sea, 
in order to compare with it the forms collected in Alaska, so that there 
remains a possibility that one of these may be the same as that described 
by him.? Sg 
AMMOTHEA LATIFRONS pp. nov. 
Plate x1, fig. 3; plate xvi, figs. 1-9; plate xvut, figs. 1-3. 
Dype.— 6 and @, University of California, No. 19,503, St. Paul Island, 
Bering Sea. 
Trunk broad, especially anteriorly, each outer corner having an erect 
conical protuberance armed with a few spines, short, tapering posteriorly 
in a V-shape, smooth; sutures indistinct anteriorly, obsolete posteriorly ; 
lateral processes very closely crowded, nearly twice as broad distally, 
1Sars (’91, p. 137) considers Pasithoé as probably distinct, and uses it as the type of 
a family, the Pasithoide, including with it one other genus, Colossendeis. 
2 Subsequent comparison with Schimkewitsch’s description shows that 4. dorealis is 
distinct from the species described in this paper. 
