208 BULLETIN OF THE 



tides of lime do not cover the whole plate ; at many points they are widely 

 separated. This aggregation of separate particles is the distinctive character 

 of the subgenus Prolepis, to which A. foliolatus belongs. 1 



The genitalia of the large individual from Olympia is figured on Plate IX. 

 Fig. D. The ovary is tongue-shaped, white, very long and narrow; the oviduct 

 is greatly convoluted ; the testicle is black in several groups of cceca ; the 

 vagina is very broad, square at the top with the terminus of the oviduct, and 

 the duct of the genital bladder entering it side by side ; the genital bladder is 

 small, oval, on a short narrow duct ; the penis sac is of a shining white color, 

 apparently without retractor muscle; it is short, very stout, blunt at the upper 

 end where the extremely long vas deferens enters, and gradually narrowing to 

 the lower end. ' There are no accessory organs. The external orifice of the 

 generative organs is behind the right tentacle. 



The form from Gray's Harbor (Plate IX. Fig. H) has its generative system 

 very much the same as described above. The ovary is much shorter and 

 tipped with brown, and is less tongue-shaped. The penis sac tapers to its 

 upper end. The vagina is not squarely truncated above. The system much 

 more nearly resembles that of Prophysaon Andersoni (see Terr. Moll., V.) than 

 that of the Olympia foliolatus. 



The jaw of both forms is very low, wide, slightly arcuate, with ends attenu- 

 ated and both surfaces closely covered with stout, broad separated ribs, whose 

 ends squarely denticulate either margin. There are about 16 of these ribs in 

 one specimen from Gray's Harbor, and over 20 in that of the true foliolatus from 

 Olympia (see Plate IX. Fig. B). The lingual membrane in each form is long 

 and narrow, composed of numerous longitudinal rows of about 50-1-50 teeth, 

 of which about 16 on each side in the true foliolatus (Plate IX. Fig. C), and 

 19 in the other form, may be called laterals. Centrals tricuspid, laterals 

 bicuspid, marginals with one long inner stout cutting point, and one outer 

 short side cutting point. The figure shows a central tooth with its adjacent 

 first lateral, and four extreme marginals. 



I have figured both the true foliolatus from Olympia (Plate VIII. Fig. A) 

 and the smaller form from Gray's Harbor (Plate VIII. Fig. C) of natural size. 

 Should the latter prove a distinct species or variety, I would suggest for it the 

 name of Hemphilli, in honor of the discoverer of it and the long lost foliolatus. 



Prophysaon Hemphilli. 

 See Plate VII. Fig. D, drawn by Cockerell from the living animal. 



Prophysaon Andersoni, J. G. Cooper. 



Figure 1 of Plate III. was drawn from a specimen received from Dr. Cooper. 

 It represents the true Andersoni, distinguished by a light dorsal band, and by 

 genitalia such as I have described for P. Hemphilli. The same form, also re- 



1 Mr. Theo. D. A. Cockerell, finding the slug not to be a true Arion, is about to 

 suggest for it the generic name of Phenacarion. 



