802 MR. J. liiTCiiiK ON iiVDUoiDS [May 24, 



Family Cam 1'AXULINID-E. 



^Operculardla lacerta Johnston, p. 812. 

 * Cali/cfUa oli(jista, sp. n., p. 813. 

 Cuspidella costata, Hincks, p. 814. 



Family Lafoeid/K. 



LafoiJa serrata Clarke, p. 815. 



* „ venusta Allman (?), p. 815. 



Family Bertulauid^. 



*/Seriularella cylinilrica Bale, var. pasilla, u., p. 817. 



„ pohjzonias L., var. corniUa llitchie (?), p. 8 1 8. 



* ,, quadridens Bale, p. 818. 

 Idia pristis Laniouxoux, p. 820. 

 JJiphasia diyitalis Busk, p. 821. 

 Sertalaria turblnata Lamouroux, p. 821. 



Family Plumularid^. 



riamularia setacea Linn. (?), p. 822. 



,, sp. indet., p. 822. 



AirteneUa secundaria Gmelin, p. 822. 

 LytocarpHS jyennarias Linn., p. 822. 



,, ^;/tfce?itceits Busk, p. 823. 



* indiriitcs a jijiccies recorded fur tlie first time fmin tlie liidiuii Oce«n. 



Systematic Discussion. 



I. GYMNOBLASTEA. 



Family Clavib.e. 



CoiiYDEXDUiUM SESSILE, sp. u. (Plate LXXVI. figs. 1 it 2.) 

 TiioriiosoME. — Colony small, the largest of tlie three collected 

 heing only 37 mm. in height. The stem is strongly fascicled, 

 1-5 mm. thick towards the base, and straight. It may divide 

 into main branches, which are beset by numerous smaller, almost 

 equal branchlets, about 1 mm. in length. These spring from 

 cwo opposite sides, and lie roughly in one plane. The branchlets 

 on any one side are almost e(piidistant from each other, but their 

 jiositions bear no regular relation to those of the o})posing series. 

 'J'hcy taper very slightly towards the base, but there is no trace 

 of ringing nor of wi'iukling. 



'riu' majority of the hydranths s(tring from tubes on the anterior 

 fitirface of the branchlets, although a few are al.'o scatteied on the 

 main branches. The hydianth tubes do not become free from 

 the coimiion fascicle, except rarely and for an extremely short 

 ilistaiKc; nor are special hydrophore-like portions developed. 

 Tlins the hydranth projects simply from the oj)en mouth of a 

 tube, the adcaviline wall «)f which is adnate. The hydranth tubes 



