TATULA. 



159 



PI. XI. Fig. A rcprosonts the genitalia of a Salmon jRiver fipccimen of the 

 typical slri(/osa. The testicle, as usual, was in the summit of the upper lobe of 

 the liver. The epididymis is long, convoluted in its half nearer the testicle. 

 The accessory gland is composed of several long, black ccEca. The oviduct is 

 sac-like, not convoluted, containing eight embryonic shells. The genital blad- 

 der is small, -with a long, narrow duct entering the upper part of the vagina, 

 near which it is swollen. The vagina is short and swollen. The penis sac is 

 long, stout, blunt at apex, where the retractor muscle is inserted. The vas 

 deferens becomes greatly swollen before it enters the sac of the penis, which it 

 does above the insertion of the retrac^r muscle. 



As tne shells of some forms of this species are difficult to distinguish from 

 some forms of Patula solitaria, it is interesting to state that the genitalia of a 

 specimen of the latter from the same locality offer very distinct specific char- 

 acteristics, agreeing with Dr. Leidy's figure in Vol. I. 



Since the above was written, I have received from Mr. Henry Hemphill 

 specimens of H. Haydeni with the animal, and so variable that I am con- 

 vinced of its being a variety of sfrigosa. The revolving lines are not always 

 present, and vary greatly in development. The young shells have erect coarse 

 hairs on the revolving lines. 



The discovery is an interesting one, as the species was 

 formerly considered extinct. One of the original lot of speci- 

 mens is here figured. Mr. Hemphill found several curious va- 

 rieties. 



The jaw of Haydeni (PI. XVI. Fig. G), as well as its geni- 

 talia and viviparous habit, is the same as in strigosa. Its lin- 

 gual dentition I figure on PI. XVI. Fig. B. There are 

 33 — 1 — 33 teeth. The eleventh tooth has the side cusp and 

 cutting point. 



Another curious form of this protean species was also found by Mr. Hemp- 

 hill in the same locality, a spur of the Wahsatch Range forming the western 

 boundary of the valley in which Salt Lake City lies. This 

 form is here figured. Its dentition is given on PI. XVI. 

 Fig. A. There are 27 — 1 — 27 teeth, the tenth having the 

 side cusp and cutting point. The jaw and genitalia are as 

 in strigosa. Small specimens of this curious form resemble 

 P. Idahocnsis. The latter, however, as well as P. Hemphilli, 

 has side cusps and cutting points to central and all the 

 lateral teeth of the linsfual membrane. . 



Fig. 67. 



P. Haydeni. 



Fig. 68. 



:i-.\«: 



.i.«i^ 



H. Cooperi 

 var. 



Patula Hemphilli, Newcomb. 



Shell widely umbilicated, sublenticular, rough, with incremental wrinkles, 

 and minute revolving striaj, bearing separated, short, stout bristles ; dirty white, 

 with a revolving reddish band ; spire slightly elevated, apex obtuse ; whorls 4, 



