102 Moll. 
MOLLUSCOIDEA. 
oviduct and vas deferens present ; basal gemmation ; no systems. 
Clavelina (Sav.), Diazona (Sav.). 
am. Chondrostachyidce. Viscera beneath the branchial sac ; testes 
in shape of grap-like follicles, no oviduct ; the individuals aro 
placed on a common stalk, gemmation on its free end. Chon- 
drostachys (Macdon.), Oxycorynia (Drasche). 
Fam. Distomidce. Situation of viscera and genital organs as in the 
preceding family ; basal prolongations of the ectoderm ; embry- 
onal gemmation; a common tunica. Distoma (Gartn.), Distaplia 
(Della Valle). 
Fam. Polyclinidce.. Viscera beneath the branchial sac, genital organs 
in a long appendage, which is traversed by a flat, tubular pro- 
longation of the branchial sac; testes in numerous follicles along 
the vas deferens ; oviduct ? ; post-abdominal and rudimentary 
embryonal gemmation ; forming systems ; a common tunica. 
Aplidium (Sav.) : post-abdomen not stalked, rectum left hand 
of the stomach, comprising as subgenera, Aplidium , Fragarium , 
Morchellium , Gircinalium (all by Giard), Amaroucium (M. 
Edw.), Syncecum (Phipps), Sidnyum and Sigillina (Sav.). Second 
genus, Polyclinum (Sav.) : post-abdomen stalked ; rectum right 
hand of the stomach. 
Fam. Didemnidce. Visceral sac stalked ; testis forming only one 
large follicle, vas deferens spirally wound around it ; no oviduct; 
prolongations of the ectoderm, provided with muscles; intes- 
tinal gemmation, rudimentary embryonal gemmation ; systems; 
a common tunica, mostly containing calcareous spicula. Didem- 
num (Giard), Leptoclinum (M. Edw.). 
Fam. Diplosomulce. Intestinal noose beneath the branchial sac, and 
nearly horizontal ; testis forming two large follicles, with a broad 
vas deferens ; no oviduct; lateral prolongations of the ectoderm, 
provided with muscles; intestinal gemmation and embryonal 
gemmation ; systems; a common tunica. Diplosoma (Macdon.) 
The author uses the term “cormus’’ for the whole of animals which 
are more or less intimately united, = colony of former authors ; and 
“ system ” for the whole of animals which have a common cloaca, = “ coe- 
nobium ’’ of Giard. He employs the terms right and left in the same sense 
as Milne-Edwards, and not as Lacaze-Duthiers, whose terms are based on 
a very doubtful comparison with the Mollusca. Synascidieu von Rovigno, 
pp. 5-11. 
J3otryllus , subg. Polycyclus, cyaneus , sp. n., violaceus , sp. n. (not B. vio- 
laceusy M. Edw.), and renieri (Lam.), Rovigno, Istria ; Drasche, l. c. pp. 13 
& 14, pis. i. figs. 1 & 4, & ii. fig. 6. 
Botrylloides luteum [-ws], sp. n., purpureum [-ws], sp. n., and rubrum[-ber\ 
(M. Edw.), Istria ; id. 1. c. p. 15, pis. i. figs. 2 & 3, & ii. fig. 7. 
Sarcobotrylloides , subg. n. of Botrylloides. Distinguished by the fleshy 
cormus. S. superbum\_-us'\ ) sp. n., Rovigno and Pola, in Istria; id. 1. c. 
pp. 8 & 14, pi. i. fig. 5. 
Oxycorynia fascicularis (Drasche) [see Zool. Rec. xix. Moll. p. 107] 
described by the author; Verh. z.-b. Wien, xxxii. pp. 175-177, Ilogoleu 
