Aoridae from the Hancock Expedition — Myers 
499 
females from those of M. schmitti depends upon 
this negative character, female para type material 
has been designated from the Panama collections 
in which M. schmitti has not been recorded. 
These can definitely be assumed to be females of 
the M. hancocki males which they accompany. 
M. hancocki appears to tolerate a narrower 
range of ecological conditions than does M. 
schmitti, all the specimens of the former being 
obtained from sand, while the latter was col- 
lected from mud, sand, algae, shells, and coral. 
M. hancocki is apparently a shallow water form, 
occurring at ll/ 2 -10 fathoms; M. schmitti ranges 
slightly deeper than this, to 15 fathoms in 
present samples, and to 23 fathoms (J. S. Garth, 
personal communication). 
Formal Description 
type locality: Salinas Bay, Costa Rica. 
MALE holotype: Head (Fig. 6a) lobes mod- 
erately produced, obtuse; eyes circular; paragnath 
(Fig. If) with the mandibular processes long 
and slender. Body length, from anterior margin 
of cephalosome to tip of telson, 3.7 mm 
(paratypes 3. 2-3. 8 mm) ; peraeon segments 
(Fig. Ik) 3-5 each with a short, robust, 
anteriorly curved spine on its ventral surface, 
6 with a minute spine. Antennules slightly 
more than the body length, the first and 
second peduncular segments subequal, the third 
segment about I/3 the length of the second; 
flagellum 8-segmented (paratypes 8- or 9- 
TABLE 1 
Station Data 
station date locality bearings remarks 
7°45'18"N 81°32'51"W 
113- 33 
114- 33 
116-33 
9 Mar 
10 Mar 
13 Mar 
1933 
1933 
1933 
125-33 
19 Mar 1933 
185-34 
25 Jan 
1934 
187-34 
25 Jan 
1934 
190-34 
26 Jan 
1934 
204-34 
31 Jan 
1934 
257-34 
25 Feb 
1934 
398-35 
18 Jan 
1935 
460-35 
8 Feb 
1935 
461-35 
8 Feb 
1935 
475-35 
11 Feb 
1935 
476-35 
11 Feb 
1935 
477-35 
11 Feb 
1935 
478-35 
11 Feb 
1935 
479-35 
11 Feb 
1935 
480-35 
11 Feb 
1935 
481-35 
11 Feb 
1935 
564-36 
10 Mar 
1936 
Bahia Honda, Panama 
Bahia Honda, Panama 
Cocos Bay, south of Port 
Cuelebra, Costa Rica 
Isabel Island, Mexico 
Off Cartago Bay, Isabela 
(Albemarle), Gala- 
pagos 
Cartago Bay, Isabela (Al- 
bemarle) I., Galapagos 
East of south end of 
Isabela (Albermarle) 
I., Galapagos 
Gardner Bay, Espanola 
(Hood) I., Galapagos 
Off South Viradores Is., 
Port Cuelebra, Costa 
Rica 
Salango I., Ecuador 
Playa Blanca, Costa Rica 
Playa Blanca, Costa Rica 
Salinas Bay, Costa Rica 
Salinas Bay, Costa Rica 
Salinas Bay, Costa Rica 
Salinas Bay, Costa Rica 
Salinas Bay, Costa Rica 
Salinas Bay, Costa Rica 
Salinas Bay, Costa Rica 
Off south end of Tiburon 
I., Gulf of California 
7°43'46"N 
81°31'54"W 
10°33'35"N 
85°42'30"W’ 
21°51'30"N 
105°53'35"W 
0°34'57"S 
90°53'44"W 
0°36'18"S 
90°57 / ll"W 
0°55' S 
90°30' W 
1°20'40"S 
89°39'15' 
'W 
10°35' N 
85°43'15' 
"W 
r 
3 35'15' 
'S 
0 
00 
’52'52' 
'W 
10 1 
3 56' 
N 
85' 
3 52'50' 
'W 
10' 
3 56'45"N 
85' 
3 53'50"W 
11' 
3 04'25' 
'N 
85' 
3 44'40' 
'W 
ir 
>03'33' 
'N 
85' 
3 43'47"W 
11' 
3 03'20' 
'N 
85' 
3 43'30' 
'W 
ii' 
3 03'13' 
'N 
85' 
3 43'20' 
'W 
11' 
3 02'50' 
'N 
85' 
3 44'10' 
'W 
11' 
3 04'10' 
'N 
85' 
3 44'40' 
'W 
ii' 
3 03'33' 
'N 
85' 
3 44'05' 
'W 
00 
3 44'45' 
'N 
112' 
3 18'20' 
'W 
5-8 fa; sand 
shallow water; coral 
2 fa; sand, shell 
shallow water; Porites 
coral 
32 fa; mud 
8-10 fa; sand with rock 
patches 
58-60 fa; sand, nulli- 
pores 
30 fa; sand 
10 fa; sand, shells 
3 fa; sand 
3-5 fa; sand, shells 
15 fa; mud, sand, algae 
20 fa; mud 
8 fa; mud 
2 fa; coarse sand 
l l /2 fa; coarse sand 
2 fa; sand 
12 fa; shells, vegetation 
6 fa; shells, vegetation 
8-10 fa; kelp, coralline 
