50 



ZOOLOGICAL COLLECTIONS MADE DURING [JaU. 4, 



the lip. T)ie lip undergoes great variations even in the same colony. 

 lu young colonies, and in some parts of old ones, the thickened ridge 

 investing its edge is almost wanting. Again, it may _ appear from 

 the front either as a straight line, as a _ two-horned ridge, or as a 

 ridge produced mesially into a single point. 



The depth of the grooves of the surface also varies greatly, so 

 that the surface appears either (i.) as beset with round, more or less 

 elongated tubercles arranged round the median ridge, or (ii.) as 

 o-rooved, the substance between the depressions not being thus divided 

 into tubercles ; in some specimens, too, the tuberculation itself is almost 

 obliterated, apparently by thickening layers added from the exterior. 

 As the oTOOved and tiiberculated cells sometimes occur in the same 

 colonies^ it is probable that the latter (the only ones originally figured 

 and described), being, as they are, particularly thick-walled specimens, 

 are produced from the former by the thickening of the cell-wall 

 and consequent greater or less obliteration of the spaces (the last 

 stage in this process being the obliteration of the tubercles them- 

 selves), owing perhaps to age. {Cf. Hincks on the development of 

 the zocecium. Hist. Brit. Mar. Polyzoa, p. 184, where he explains 

 the origin and changes of the primary ridges and furrows.) 



Hab. Elizabeth Island, 6 fathoms, incrusting a mass of Balani 

 and enveloping stem of Sertularia. Sandy Point, 7-10 fathoms, 

 r.rom large flexible worm-tube and JBalaniis on the same. 



Ehynchopora bispinosa, Johnston. 



Lepralia bispinosa, Johnston, Brit. Zooph. (2) p. 326, pi. Ivii. 

 fig. 10. 



RhyncJiopoi-a bispinosa, Hincks, Hist. Brit. Mar. Polyz. p. 385, 

 p. xl. fig. 1. 



Eschara unicornis, Hutton ?, Cat. Mar. Moll. N. Zealand, p. 99. 



To this species are referred vfith some doubt two colonies of Escha- 

 roid form, consisting of narrow, strap-shaped branching growths, tbe 

 branches not anastomosing. The denticle within the mouth is very 

 small and sometimes absent ; the suboral umbo is often somewhat 

 eccentric, but usually high and truncate ; there is sometimes a 

 mound-like swelling bearing an avicularium on the opposite side of 

 the mouth to the umbo ; the two supraoral spines are short and 

 often stout ; the surface is rough and regularly covered with large 

 punctures and small avicularia (?) ; the cells are strongly convex and 

 cover both sides of the fronds. 



Hab. Victoria Bank, ofi' S.E. Brazil, 33 fathoms. 



Lepralia. 



Lepralia s. str. (as limited by Smitt and Hincks). 



Lepralia monoceros, Busk, Cat. Polyz. Brit. Mus. p. 72, 

 pi. xciii. figs. 5, 6. 



The punctures of the surface generally present a small tubercle 



