SMITTIA TRISPINOSA. 353 



I only know this species from Busk's description and 

 figures, and can add nothing to them. It seems to be 

 nearly related to S. cheilostoma. 



SMITTIA TRISPINOSA, Johnston. 



Plate XLIX. figs. 1-8. 



DISCOPORA TRISPIXOSA, Johnst. Ed. Phil. Journ. xiii. 322. 



BERENICEA TRISPINOSA, id. Trans. Newc. Soo. ii. 268. 



LEPRALIA TRISPINOSA, id. B. Z. ed. 2, 324, pi. Ivii. fig. 7 : Busk, B.M. Cat. 



ii. 70, pi. bcxxv. figs. 1, 2, pi. xcviii., pi. cii. fig. 2 : Hincfa, 



Greenland Polyz., Ann. N. H. Jan. 1877, 100, pi. ri. fig. 1. 

 LEPRALIA VARIOLOSA, var. a, Johnst. B. Z. ed. 2, 317, pL IT. fig. 8. 

 ESCHARELLA jAcoTiNi, Smitt, forma LAMELLOSA, and forma TYPICA, loc. cit. 



Exit Fort. iv. 11 & 86, pi. xxiv. figs. 63-57. 



? ESCHARELLA JACOTINI, Smitt, Flor. Bryoz. pt. ii. 59, pi. x. fig. 199. 

 LKPRALIA JEFFREYSI (=var. a), Norman, Prelim. Eep. 'Valorous' Cruise, 



Proc. Roy. Soc. no. 173 (1876), 208. 



Zoopcia ovate or elongate-ovate, sometimes almost rectan- 

 gular, disposed in linear series or quincuncially, sub- 

 granular, separated by raised lines, and punctured round 

 the edge ; orifice suborbicular peristome thin, more or 

 less raised, usually produced in front into a spout-like 

 sinus, a denticle within the lower margin ; oral spines 

 2-4 ; frequently a large avicularium on one side, a little 

 below the orifice, mandible acute and (usually) directed 

 upwards; occasionally a smaller oval avicularium, on 

 one or both sides of the orifice, with rounded mandible, 

 pointing downwards. Ooecia ample, globose, united to 

 the cell above, somewhat flattened in front, usually with 

 two or three large pyriform punctures. 



Colonies forming large yellow crusts. 



Var. a (Jeffrey si, Norman) . Zooecia rectangular, smooth 

 or subgranular, surface much depressed ; peristome 

 not raised, denticle very conspicuous; oval avicularia 

 irregularly distributed over the surface, sometimes nu- 

 merous ; pointed avicularia often rare, and of small size. 



