64 PROCEEDINGS OF THE ACADEMY OF [1880. 



the foremost, with rather obtuse point (fig. 9). The buccal crop (fig. 

 4, 5) as large as the bulbus, of quite the usual form, rather petiolate.' 

 The salivary glands forming (on each side) a large, thick, whitish 

 mass between the bulbus and the central nervous system (with the 

 glanduloe sanguineje). 



The oesophagus rather wide. The stomach and the intestine as 

 usual. The liver as usual, much flattened on the right anterior half 



The heart rather large. The gland, sanguineae large, whitish, cover- 

 ing the upper side of the central nervous system, the foremost part in one 

 individual very narrow. The renal syrinx about 1.0 mm. long, with 

 strong longitudinal folds, its clothing as usual. 



The anterior genital mass 4-4.5 mm. long by a breadth of 1.25-1.5 

 and a height of 3-3.3 mm., yellow-white, plano-convex ; the anterior, 

 and partly the superior portion formed by the coils of the whitish sper- 

 matoduct ; in one individual one coil embraced the sheath of the radula. 

 The first part of the spermatoduct strong, when unrolled about 25.0 mm. 

 long ; the succeeding part of the length of 4-5.0 mm., thinner ; the 

 rest about 7.0 mm. in length, stronger, nearly as in the first part. In 

 the beginning of this last part the true spermatic duct was rolled up in 

 tight coils, the remaining part of its length was nearly straight. The 

 penis about 1.5 mm. long, with the usual glans in the interior. The 

 spermatotheca (fig. 6a) spherical, its chief duct nearly twice as long as 

 the bag, the vagina short (fig. 6e). The spermatocysta appeared 

 pyriform (fig. Qd) 



In color this form seems to differ from the typical one, as that is 

 represented by Alder and Hancock (Monogr., Part vi, 1854, fam. 3, 

 li. 9); in the anatomical relations no specific differences could be 

 detected. 



A specimen of another variety was obtained by Dall, on a gravel 

 beach, at low water, in June, 1874, at Port Etches (Prince William 

 Sound . According to Dall, the mantle was of "brown " color. 



The specimen had a length of 13.0 mm,, by a breadth of 8.0 mm., 

 and a height of 5.0 mm. ; the height of the leaves of the gill was 

 about 1.0 mm. The color of the back was brownish and yellowish; 

 that of the gill, as well as of the rhinophoria, yellowish. The number 

 of leaves of the gill was about thirty. 



The bulbus pharyngeus about 1.75 mm. long, by a height of 1.5 mm. ; 

 the sheath of the radula nearly as long as the bulbus ; the buccal crop 



^ In one specimen the form of this organ was entirely as figured iu my 

 Malacolog. Untersuch. (Semper, Reisen). Tab. LXV, fig. 2. 



