128 Rev. Canon Norman — A Month on 



sent P. bella to Mr. Hincks as his P. Belli ; but, if so, it will 

 not accord with Dawson's own description. 



20. Smittia Landshorovii, Jolinst. 



An example taken at Rodberg with small roiiiid avicularium 

 and bifid denticle. It does not bear any ooecia, to prove whether 

 these are punctate or not. Neither Johnston's nor Busk's 

 figures show any ovicells ; they are both, it would seem, 

 drawn from Landsborough's specimen, now in the British 

 Museum. Busk (Cat. Mar. Pol., Cheilostoraata, pi. cii. 

 fig. 1) figured as 6'. reticulata a form which seems indistin- 

 guishable from Smittia Landshorovii. 



The figure which was next supplied to us was by Alder 

 (Quart. Journ. Micr. Sci., n. s., vol. iv. pi. iv. figs. 1-3) ; 

 here for the first time we have the ooecium as well as the 

 round oral avicularium, together with a larger spatulate 

 avicularium which he found scattered here and there among 

 the cells. The oojciuni is figured as punctate. It is punctate 

 in every specimen 1 have seen from the British Islands ; it is 

 punctate also in S. crystallinaj Norman, and in Escharella 

 porifera^ Smitt, forma typica, which I regard as another form 

 of my species. 8. crystallina may always be distinguished 

 from 8. Landshorovii, of which it is at least a marked 

 northern form, and I think specifically distinct. But 

 Escharella porijera J Smitt, foima laajuscula and ioxm?iminus- 

 cula, differ from all the preceding in having the ooecia 

 imperjbi-ate, and, as compared with ;S'. Landshorovii typica, 

 the zooecia are more tumid and the front wall more densely 

 punctate. I propose to call this form 



Smittia arctica, sp. n. (type E. porifera, var. mqj'uscula, Smitt). 



Escharella porif era, var. majuscuJa, ^m\ii, Krit. Furteck. Skaud. Hafs- 

 Bryoz. pt. iv. 18G7, p. 9, pi. xxiv. figs. 3(5-38, and forma mimuscula, 

 tigs. 33-35. 



Forma mahiscula : Kingsbay, Spitsbergen, 172 fath. 

 {Smitt); Greenland {^Valorous,' 1875); Gulf of St. Law- 

 rence {Principal Daioson). 



Forma rninuscula: Gulf of St. Lawrence {Whiteaccs). 

 All in Mus. Nor. 



21. Smittia trispinosuj Johnston. 

 Troudhjcm and llodberg. 



