LYMNZIDZ OF NORTH AMERICA. 239 
sac retractor. (PI. XIV, fig. F.) The normal form and position of 
the retractor and protractor muscles appears to be as shown in (1) 
of Fig. F. 
Several measurements of the genitalia are given below. (Dissec- 
tions Nos. 23151, 23165, 23166) : 
Penis- Rec. Prost. Vas. Penis Penis- 
Penis. sac. sem. duct. def. Kei sac ket. olell: Locality. 
1.00 1.25 1.50 1.00 2.50 1.00 1.00 6.00 Cayuga Lake 
$e, 6240. | 150: 61.00) 3.00) (ibys “en 7.00 a ff 
Poon 110° (150. 61,00. °§350) — 250, 150. , 17:00 ‘ _ 
140 160 180 140 400 100 100 800 Maine 
Tap ed41O, 9.2.50" 8.60; © 63.00" 4,00. 2.00) | « 6:20 ‘ 
In some specimens the penis is slightly enlarged toward the head. 
(Plate XI) fig. B, 1.) 
The genitalia of wmbilicata closely resemble those of parva. 
RANGE (Figure 21): Northern Maine and southern Ontario to 
Rhode Island and New Jersey, west to New York and southeastern 
Michigan. 
The range of wmbilicata is imperfectly known, as it has probably 
been identified as humilis, which it somewhat resembles. The records 
at present known show it to range from Maine to Michigan and south 
to New York and New Jersey, which indicates that it is an inhabitant 
of the Canadian and Nova Scotian regions. It is characteristic of the 
humid divisions of the Canadian and Transition life zones. Until more 
specimens have been examined from different parts of the United 
States no generalizations can be made. Umbilicata probably inhabits 
a large portion of the northern part of the United States. 
RECORDS. 
UNITED STATES. 
CoNNECTICUT: Small stream emptying into Farmington River, Unionville, 
Hartford Co. (Baker). 
Maine: Buckfield, Oxford Co. (J. A: Allen); Woodland, Aroostook Co. 
(Nylander) ; Fox Island, Penobscot River, Knox Co. (Jackson). 
MAssacHusetTts: New Bedford, Bristol Co. (Adams) ; Brook near Cabot’s 
Park, Newton; Charles River above Watertown, Middlesex Co. (Baker) ; Swamp- 
scott, near Lynn, Essex Co. (Tufts) ; Southborough, Worcester Co. (Bos. Soc. 
N. H.); Salem, Essex Co. (True); Essex Co. (Russell) ; Westfield, Hampden 
Co. (Smith. Coll.). 
MicuicaAn: Otter Lake, Lapeer Co. (Walker). 
New Jersey: Drainage ditches east of Burlington, Burlington Co. (Baker; 
Pilsbry). 
New York: South end Cayuga Lake, near Ithaca, Tompkins Co.; Erie 
Canal; Maplewood Park, Rochester, Monroe Co.; 4 miles south of Cayuga, 
Cayuga Co. (Baker); Charlotte Lake, Columbia Co. (Lea). 
Ruope IstAnp: The Fountain, Pawtucket, Providence Co. (H. F. Carpen- 
ter) ; Rhode Island (Walker). 
