THE GASTROPODA 159 
pallinm, which covers the whole 
body and projects beyond in the 
form of a siphon, and serves to 
put the animal in communica- 
tion with the external world 
and for the passage of the ova 
(Fig. 21); a foot is retained, and 
also a nervous system and oto- 
cysts ; neither eyes, branchia, 
anus, nor rectum; the stomach 
is a sac with ramifying caeca ; 
hermaphrodite ; parasitic in the 
Holothurian Deima blakei, in 
the Indian Ocean. ntosiphon 
forms the transition to the next 
family. Famity 55. Enro- 
CONCHIDAE, Fischer (= Cochlo- 
syringia, Voigt). Neither shell 
nor spirally coiled visceral mass ; 
no sensory organs, nervous 
system, branchia, or anus ; body 
reduced to a more or less tubular 
sac ; endoparasitic in Holo- 
thurians ; probably all herma- 
phrodite, with separate male 
and female gonads ; incubatory 
(“viviparous”); with conchi- 
ferous and operculiferous veliger 
larvae, without a retractor veli 
muscle. Genera — Entocolaz, 
Voigt ; visceral mass essentially 
genital and forming a swelling 
surrounded by the — pseudo- 
pallium ; digestive orifice or 
proboscis at the free extremity ; 
orifice of the pseudopallium at 
the opposite extremity by which 
the animal is fixed; a second 
accessory aperture of the pseudo- 
pallium serves for the passage 
of the genital products. Two 
species parasitic in Holothurians 
in the Pacific: EH. ludwigi, in 
Myriotrochus vrinkit from the 
Behring Sea (Fig. 138); and £. 
schiemenzt in Chirodota pisanti 
from Chili. Entoconcha, J. Miiller 
MW 
Tu TT 
LUT TT 
Li 9) 
IV: 
Fig. 138. 
Entocolux ludwigi, in situ, x 30. I, fixative 
apparatus ; II, ovary; III, uterus; IV, buccal 
orifice; V, oviduct; VI, genital orifice ; VII, ova 
separated from the ovary, by dehiscence; VIII, 
cavity around the ovary, formed by the pseudo- 
pallium ; IX, orifice of this cavity ; X, integument 
of the Holothuria. (After Voigt.) 
(Fig. 139) ; body elongated and tubular ; the aperture of the digestive tract 
rudimentary and situated at the fixed extremity of the body ; protandric 
