PLATE 5. 
Fig. 1-5. DoLaBEeLLA AGASSIZI, sp. nov. 
Fig. 1. Genital ganglion complex; gn, the genital nerve from the visceral ganglion (Plate 
fig. 2, 2583), terminating in a group of ganglia at the right margin of the adnexed genital m: 
(cf. Plate 5, fig. 4, g.g.); a, fine nerves to dorsal peritoneum; 6, nerves ramifying to the 
hermaphroditie duct; c, nerves to the small hermaphroditic duct and to the ovotestis; d, 
to the adnexed genital mass. X 50. ‘ 
Fig. 2. Ventral view of central nervous system to show the relations of the parapedal et 
missure; ao, aorta; s-b.a, subbulbar artery; 1. p. a, left pedal artery; r. p. a, right pedal 
p-P- ¢, parapedal commissure, connecting the two pedal ganglia, shown above the aorta; a 
paired nerves arising from the parapedal commissure; d, f, branches to diaphragm; h, brane 
peritoneum; c, the unpaired median nerve from the same source; 1—9, pedal nerves in ventral 1 rie 
Xx 5. ri 
Fig. 3. The four innermost lateral teeth of the thirtieth row of the radula seen obliquely fro 
above. The teeth are numbered from within outward. The hook of the fourth tooth is double : 
the tip of the base of the same is also bifid (cf. Plate 5, fig. 5). > 100. 
Fig. 4. Reproductive system as seen from below, the parts lying in their natural 
sm.h.d, the small hermaphroditie duct, its free end, ov, arising in the ovotestis, which is not rn 
sented, the closely convoluted turns of the duct narrowing on reaching the right posterior an 
the adnexed genital mass, a.g.m. It passes diagonally forward across the ventral face of 
latter, forms a loop upon its dorsal surface and returns ventrally as sm. h. d’, to open into the fe 
tion-chamber, f. c.; c.d, copulatory duct opening into the fertilization-chamber and receiving t 
duct of Cuvier, d. C., from the spermatocyst, sp.c. Into the fertilization-chamber also open the 
voluted portion of the nidamental gland dimly seen in the anterior part of the concave face, 
albumen gland, not visible in this view; ov-sp. d, the ovospermatie duct, the continuation of the 
portion of the nidamental gland into the large hermaphroditic duct, l. h. d; r. s, its blind sac-like 
culum, the seminal receptacle, near the distal end; sp. th, the spermatotheca, or vesicle of § 
dam, opening by its long slender duct, into the distal end of the large hermaphroditie duet; 7, 
a small flap of integument cut from the body-wall, through which the large hermaphroditie duct o 
in the common genital orifice; pl. v. con, the left pleuro-visceral connective; pl. par. con, the 
pleuro-parietal connective; J. v. g, left visceral ganglion; r. p. g, right parietal ganglion; v. 7, fi 
ceral nerve to spermatotheca; v. 2a, right main branch of second visceral nerve, its branch ». 2 
the organ of Bohadsch etc., and v. 2a’’ forking to rectum and anus; p. 1, first parietal nerve to vi 
region; p.2, second parietal, or osphradio-ctenidial nerve; v. 2b, left main branch of second 
nerve, ramifying to the genital ganglia, g. g., and to the heart, pericardium, kidney, ete. X 1.5. 
Fig. 5. Four innermost teeth of the fifty sixth row of the radula, corresponding in posi 
those shown in Fig. 3. The same double characteristics appear in the fourth tooth that were 
in the preceding row, shown in Fig. 3, and in all the intervening ones. X 100. 
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