GASTROPTERON. 4] 
that of Carinaria, with 13 to 2 whorls, the Jast one enveloping the 
preceding, showing under a strong lens very fine growth-strie. 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 pl. 7; 
for detailed description and figures see Bercu, Zool. Jahrb. 
Abtheil. f. Anat. u. Ont., vii, p.281, and Vayssterg, Ann. Sc. Nat., 
Zool. (6), ix, p. 1-72, pl. 1-6. In these excellent monographs, the 
entire literary history of G'astropteron also is discussed. 
The jaws are weakly-developed, consisting of two small lamellose 
plates (pl. 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 (pl. 8, figs. 12, 13). 
The radula lacks median teeth as in Philine. The laterals (pl. 
7, figs. 7, 8, 9, three views of one lateral) have the hooked form with 
a serrate internal crest seen in Philine. The uncini (pl. 7, fig. 5, 
and fig. 6) are also practically as in Pkiline, narrower than the 
laterals, without serrate crest. 
The penis is elongated, cylindrical (pl. 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) 33 to 6 cm. long in the smallest, 8 to 9 in the largest 
individuals when straightened out. 
G. 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-shan Bay (Regent’s Sword), 3 fms. 
G. sinense Av., Ann. Mag. N. H. (3), viii, p. 189 (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 
