Hughmilleria socialis Sarle 
Page 335 
See plates 59-62 
Middle portion of first two sternites to show female genital appendages, 
the overlap of the metastoma upon the opercular appendage and 
that of the latter on the next appendage. x 2 
First two sternites showing male appendage, from the inside of body. 
X 2 
3 Middle portion of operculum and second sternite showing fused parts 
of female opercular appendage and lanceolate shape of appendage of 
second sternite seen from inside of body. x 2 
4 Half operculum with attached female opercular appendage. Natural 
size 
5 Male genital appendage, a portion of which is scaled away furnishing a 
cast of the interior. x 34 
6 Male genital appendage. Natural size 
7 The free portion of the opercular appendage of a female showing the 
8 
9 
I 
jJ 
No 
point of overlap and fusion of the two parts. x 2 
Second tergite showing the antero-lateral lobes. Natural size 
First postabdominal ring segment. Natural size 
o Half of male operculum showing the face of the median cleft. Natural 
size 
11 Half of female operculum showing the face of the median cleft. Natural 
size 
12 Section showing the cylindrical form of the postabdomen. Natural 
size 
13, 15 Two views of telsons showing the dorsal carination. Figure 13, 
x 34; figure 15, x 2 
14 Uncompressed telson. x 2 
Hughmilleria socialis Sarle var. robusta Sarle 
Page 340 ; 
16 Fragment of abdomen showing relatively great width and abrupt post- 
abdominal contraction. Natural size : 
Horizon and locality. Pittsford shale. Pittsford, Monroe co., N. Y. 
The originals are all cotypes of the species and deposited in the State 
Museum 
566 
