frout the Andaman Islands. 525 



Loc. Growing oti Lytocarpus pnceniceus (Busk), dre^lged 

 8 miles west of [nteiview Island, Andaman^. Depth 270- 

 45 fathoms. 



Sertularidae. 



Sertularella polyzonias (Linn.), var. cornuta, nov. 



Trophosome. — Stem more definite than in var. yracilis of 

 Biitish waters and branches more regular in their alternate 

 origin. The facies of the trophosome on the whole approaches 

 that of var. robusta, Kirchenpauer, from the Cape of Good 

 Hope. 



Gonosonte. — While the gonangia have the elongate-ovate 

 shape and the strongly marked corrugations of typical 

 specimens, they are surmounted by four stout spines lying 

 crosswise in u plane at right angles to the long axis of the 

 gonangiura. To this character is due the designation of the 

 variety. 



Loc. (a) Andaman Islands. Depth 490 fathoms. 



(b) 8 miles west of Interview Island, Andamans. Depth 

 270-45 fathoms. 



Diphasia tJiornelyi, sp. n. 



Trophosome. — Colony delicate, unbranched, with a non- 

 fascicled stem, which springs from a creeping stolon. The 

 stems show no signs of nodes, but bear hydrothecEe from the 

 base upwards. The hydrothecee are biserial, both rows lying 

 in the same plane, but they vary much in their position 

 relative to one another, for although in most cases they are 

 alternate or subalternate, on occasion an opposite arrange- 

 ment is simulated. A hydrotheca is deep and narrow, with 

 the inner edge adnate to the stem for practically its whole 

 length, with the exception of a short, horizontal, knobbed 

 ledge upon which the adcauline operculum is hinged. A 

 short upturned intrathecal septum projects into the hydro- 

 theca cavity from the middle of the abcauline wall, which 

 beneath this point becomes much thicker. The distal part of 

 the hydrotheca resembles a bracket projecting from the stem. 

 The margin is smooth and rimmed, in shape arc-like, the 

 curve of the arc bending outwards, and the aperture is tilted 

 somewhat towards the stem. The partition separating hydro- 

 theca cavity from stem cavity lies almost parallel to the 

 abcauline wall, and terminates in a thickened ridge. 



Gonosome. — Stalkless t>onothec£e arise from close below 



