MOLLUSCOIDA. 609 
tions are given of each species, with its synonymy, distribution 
in the northern seas, and depth at which it lives : — 
CmsiEiE (/. d. pp. 116-140, pi. 16). Crista ehurnea, Linn., and as var. 
C. cornuta (Linn.), C. producta (Sm.), C. eburnea (Linn., auctt.), and C, 
dentimlaia (Lam.). 
Diastopobidje (1. c. pp. 395-398 & 415-434, pi. 8). Diastopora repens 
(Wood) ; D. simplex (Busk) j D. hyalina (Flmng.), and, as var., D. ohelia 
(Johnst.) and D. latomarginata (13 ’Orb.) j I). patina (Lam.). 
Mesenteripora meandrina (Wood). 
Tubuliporidje (/. c. pp. 398 & 404-465, pis. 3-6, 9, 10), Tnhulipora {Id- 
monea) atlantica (Forbes) ; T. (I.) fenestrata (Busk) ; T. (/.) serpens (Linn.), 
and, as var., T. (Hass.) ; T. {Phalangella) palmata (Wood) {=Alecto 
dilatans, Busk) ; T, {P.) Jimhria (Lam.) {—Tubipora Fabr.,= 7*. Jla- 
bellaris, Jolmst., auctt.)j T. {P.)Jlahellaris (Fabr.) ( = 7’.fcm<cosa,M.-Edw.,= 
T. plialangea, Johnst.) j 2\ {Proboscinaj Aud.,= Gray) incrassatn 
(D’Orb.) (=P. vcntricosajP\xs\i,=^ Alecto granxdata^ auctt.); T. (P.) fungia 
(Couch) (= T. penieillataf Johnst.) j T, pcnicillata (Fabr.) {^Defrancia stria-^ 
tula, Busk). 
IIoBNERiDiE (/. c. pp. 404 & 465-474, pis. 6,7). Horner a violacea (Sars), 
and, as var., II. proboscina (Sm.) ; II. lichenoides (Linn.) {—II. Busk). 
Lichenoporid.® {1. c. pp. 405-406 & 474-487, pis. 10, 11). Piscoporella 
verrucaria (Linn.) : a. forma verrucaria (Fabr.) = D. jlosculus, Hincks ; 
b. forma crassiuscula (Sm.) = 73. grignonensis, = Defrancia rugosa, id. ? ; 
c. forma hispida (P\mn^.)—IIeteroporella radiata, Busk. 
FRONDiPORiDiE {1. c. pp. 407 & 487-489). Frondipora verrucosa (Lmrx.). 
CoRYMBOPORiDJE {1. c. pp. 407 & 489-496, pi. 11). Corymbopora fungi- 
formis, sp. n., Smitt, 1. c. p. 407, pi. 11. figs. 13, 14, Ilammerfest. 
Coronopora truncata (Jameson). 
I)EFRANCiADiE. Defrancia lucernaria (Sars). 
New species : — 
Crisia attenuata, Heller, 1. c. p. 117, Taf. 4. figs. 1, 2, Lesina ; C.Jistidosa, 
Heller, 1. c. p. 118, Taf. 3. fig. 5, Lissa, &c. ; C. reciirva, Heller, 1. c. p. 118, 
Taf. 4. figs. 3, 4, Lesina. 
Idmonea setpula, Heller, 1. c. p. 120, Taf. 3. figs. 8, 9, Lesina ; I. mene- 
ghinii, Heller, l.c. p. 120, Taf. 3. figs. 6, 7, Lesina, Lissa; I. trifoi'is, Heller, 
1. c. p. 120, Lesina. 
Discosparsa anmdaris, Heller, 1. c. p. 123, Quarnero, on Myriozoon trun- 
catum. . 
Alecto par asita, 1. c. p. 126, Taf. 3. fig. 10, Lissa, on Eschara cervicornis. 
Alecto compacia, Norman, 1. c. p. 204, deep water in the Minch and Shet- 
land. Near to A. dilatans. 
Tmnysonia, gen. nov.. Busk, 1. c. p. 242. Polyzoary arising from a rather 
thick central bnso (substipitato), lobato, stolliform ; lobes curved, with a 
median angle ; tubes wholly immersed ; orifices disposed in straight lines, 
extending from the median angle to the denticulate margin of the lobes > 
interspaces cancellous. T. stellata, Cape of Good Hope, parasitic upon On- 
chopora tubulosa, pi. 36. figs. 10, 11. 
