GASTROPTERON. 41 



that of Carinaria, with 1$ to 2 whorls, the last one enveloping the 

 preceding, showing under a strong lens very fine growth-strise. It 

 is situated at the posterior part of the liver, a little process of which 

 projects into its cavity, it is a little behind and to the right of the 

 anus, its convexity turned toward the foot. The delicate membrane 

 mentioned above is adherent to the peristome, and is doubtless a 

 non-calcified prolongation of the cuticle of the shell. It covers all 

 of the dorsal surface of the viscera, part of the sides, and nearly as 

 far forward as the end of the cephalic disk. 



A very general view of the viscera is shown in fig. 10 of pi. 7; 

 for detailed description and figures see BERGH, Zool. Jahrb. 

 Abtheil. f. Anat. u. Ont., vii,p.281, and VAYSSIERE, Ann. Sc. Nat., 

 Zool. (6), ix, p. 1-72, pi. 1-6. In these excellent monographs, the 

 entire literary history of Gastropteron also is discussed. 



The jaws are weakly-developed, consisting of two small lamellose 

 plates (pi. 8, fig. 16), one on each side of the median line of the 

 upper part of the mouth. The plates have a mosaic surface, show- 

 ing the ends of the crowded subcylindrical bodies of which they are 

 composed (pi. 8, figs. 12, 13). 



The radula lacks median teeth as in Philine. The laterals (pi. 

 7, figs. 7, 8, 9, three views of one lateral) have the hooked form with 

 a serrate internal crest seen in Philine. The uncini (pi. 7, fig. 5, 

 and fig. 6) are also practically as in Philine, narrower than the 

 laterals, without serrate crest. 



The penis is elongated, cylindrical (pi. 8, fig. 11), lying as usual on 

 the right side of the buccal mass, 6-11 mill, long, usually carmine- 

 red outside, sometimes yellowish-white, red at the apex only ; pros- 

 tate (fig. 11) 3i to 6 cm. long in the smallest, 8 to 9 in the largest 

 individuals when straightened out. 



O. SINENSE A. Adams. Unfigured. 



Animal flesh-colored, dotted and netted all over with carmine ; 

 body paler, the viscera showing through the sub pellucid integu- 

 ment ; foot lobe large, free, with entire margins, rounded, the sur- 

 face dotted and reticulate with red. (Ad.~). 



Hulu-slian Bay (Regent's Sword), 3 fms. 



G. sinense AD., Ann. Mag. N. H. (3), viii, p. 139 (Aug., 1861). 



I obtained three individals of this species in the dredge from 

 three fathoms of mud. I placed them in a clear bottle of salt water, 

 and observed them some time. Chiaje might well be excused for 



E LlB 



OF THE 



TJNIVERSITT 

 CALIFORNIA 



