MUSEUM OF COMPARATIVE ZOOLOGY. 183 



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 ovi- 

 duct is greatly convoluted ; the testicle is black in several groups of coeca ; 

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

 and the duct of the genital bladder entering it side by side ; the genital blad- 

 der 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 narrow- 

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

 the generative organs is behind the right tentacle. (See 3d Suppl., Plate IX. 

 Fig. D.) 



The jaw is very low, wide, slightly arcuate, with ends attenuated and both 

 surfaces closely covered with stout, broad separated ribs, whose ends squarely 

 denticulate either margin. There are about 20 of these ribs. (See Plate IX, 

 Fig. B.) 



The lingual membrane is long and narrow, composed of numerous longitu- 

 dinal rows of about 50-1-50 teeth, of which about 16 on each side (Plate IX. 

 Fig. C) 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. 



Phenacarion Hemphilli. 



This form is figured on Plate VIII. Fig. C of 3d Suppl. When extended 

 fully, it is 70 mm. long. It is more slender and more pointed at the tail than 

 foliolatus. The body is a bright yellow, with bluish black reticulations. The 

 edge of the foot and the foot itself are almost black ; shield irregularly 

 mottled with fuscous ; the body also is irregularly mottled with fuscous, and 

 has one broad fuscous band down the centre of the back, spreading as it joins 

 the mantle, with a narrower band on each side of the body. The other charac- 

 ters, external and internal, are given below. It loses its color on being placed 

 in spirits, becoming a uniform dull slate-color. Mantle lengthened oval. 

 Shell-plate represented by a group of calcareous grains concealed in the mantle; 

 it is impossible to remove it as one shell-plate. A decided caudal pore. 



Phenacarion foliolatus, var. Hemphilli, W. G. Binnet, 3d Suppl. to Terr. Moll. V., 

 p. 208; Plate VIII. Fig. C; Plate X. Fig. H (genitalia). 



Gray's Harbor and Chehalis, Washington, and Portland, Oregon (Hemphill); 

 a species of the Oregon Region. 



On the only living one of the lot from Gray's Harbor, the pore was dis- 

 tinctly visible, and is figured on Plate VIII. Fig. C. Usually it seemed more 

 " a conspicuous pit " than a longitudinal slit, as in Zonites. At one time I 

 distinctly saw a bubble of mucus exuding from it. It opened and shut, and is 



