120 PROCEEDINGS OP THE ACADEMY OF [1879. 



6-7.0 mm. high, ovoid, plano-convex, flattened on the left side. 

 The ampulla of the hermaphroditic duct usually crossed over the 

 left side, whitish, sausage-shaped, 6-7 mm. long, bj - 1.1-2.0 mm. 

 in diameter. The windings of the spermatoduct rested on the 

 anterior margin of the genital mass, the first part thicker but not 

 much longer than the rest, which was thinner and stronger (in 

 the largest individual 7-10.0 mm. long). A stricture unites the 

 two parts, the last passing without definite limits into the nearly 

 cylindrical or elongate-conical (retracted) penis, which was about 

 1.5-2.5 mm. long, the somewhat elongated glans being straight or 

 curved, 0.5-0.6 mm. in length, by 0.08-0.1 mm. in diameter (fig. 

 18). It was furnished with irregularly set (fig. 5) rows of pale- 

 yellowish hooks, which rose to a height of about 0.016 mm. They 

 were straight or curved, sometimes irregular or connate (figs. 5, 

 6), mostly solitaiy, yet sometimes arranged in small groups 

 (tig. 6); the sperm duct continued (fig. 18a) through the whole 

 length of the glans to the round orifice on the point of the 

 glans ; there was no continuation of the armature of the glans 

 backwards over a longer portion of the sperm duct. The sperma- 

 totheca spherical, about 2-3-0 mm. diameter; its own duct a little 

 longer than the leg, rather wide, then uniting with the thinner 

 and somewhat longer (and wider at the union) duct of the sper- 

 matoc<j*to, which was also round and of the diameter of 1-1.5 

 mm.; both organs resting upon the anterior margin of the mucus 

 gland; the vagina about as long as, and a little wider than, the 

 special duct of the spermatotheca. 1 The large mucous gland 

 j-ellowish-white or yellow; the opaque part on the upper part of 

 left side Vellow or brownish ; the cavity empty. 



2. Cadlina pacifica, Bergh, n. sp. Plate VII. figs. 19, 20; PI. VIII. figs. 7-18. 

 t 

 Color crerulescente albidus. 



Branchia e foliolis novem composita. 



Hob. Oc. Pacific, sept. (Captain's Ba} T , Unalashka, and Coal 

 Harbor, Shumagin Ids.). 



Pall obtained a living specimen of this species at Captain's 

 Bay, Unalashka, in May, 1872, at 1ow t water and on rocky bottom. 

 The color of the living animal he states to have been "bluish- 

 white." 



The alcoholic specimen was of a uniform yellowish color, with 



1 Hancock and Einbleton, 1. c. 1852, PI. XV., fig. 5. 



