102 Rev. T. Hiiicks on Polyzoa 



14. Lepralia (Dtscopora) sinceraj Smitt. (PI. XI. fig. 2.) 



One or two specimens of this well-marked form occur. 

 Smitt reports the s]iecies as common in the Arctic Sea as far 

 as Spitzbcrgen, in 19-60 fathoms. 



Lovdn has taken it in Finmark. Off Hare Island, Waigat 

 Strait, entrance of Baffin's Bay, 175 fathoms (iVor??ia?i). 



15. Lcjyralia porifera, Smitt. (PI. X. figs. 1 & 2.) 



Not uncommon. 



[Spitzbergen, not rare, in 20-80 fathoms (Swedish Expe- 

 dition, teste Smitt) ; Hammerfest [Loven] ; South Devon 

 {T. //.).] 



Several forms occur which seem to be related to this species 

 or to the true L. {Eschara) Landshorovii. I can most fully 

 adopt Smitt's naive declaration respecting the last-named : — 

 " This species, in all its varieties of calcification, has given 

 me much trouble." It is, indeed, a matter of extreme diffi- 

 culty to interpret satisfactorily the group of forms which 

 bear a more or less near relationship to the L. Landshorovii 

 of Johnston. In the first place I believe we may accept 

 Smitt's L. porifera as a good species, taking as the type his 

 pi. xxiv. fig. 30 {' Kritisk Forteckn.'). 



The " forma «Hn?<Aru?a " and "forma majuscida" ranked 

 under it, he has himself, as a result of further examination, 

 transferred to his Escharella Landshorovii ('Floridan Bryozoa,' 

 part ii. p. 60). 



In L. porifera the zoooecia are short, ovate, or rhombic, 

 flattish, very thickly punctured over the entire surface, and of 

 a dull white colour ; the mouth is suborbicular, slightly con- 

 tracted below, where tw^o small denticles mark the position of 

 the hinge of the opercular valve and form a shallow sinus on 

 the lower margin ; the peristome is very slightly elevated, and 

 there is no central denticle : the avicularium projects imme- 

 diately below the inferior margin; it is larger than in Z. 

 Landshorovii, and of a more elongate form ; the oocecium is 

 rounded, closely adnate, not hooded, somewhat depressed in 

 front, and perforated ; spatulate avicularia none. 



In the typical L. Landshorovii the zoooecia are oblong, 

 much lengthened out, somewhat flat, vitreous and glistening 

 when fresh, covered over the whole surface with rather large 

 pores or merely punctured round the margin ; the mouth sub- 

 orbicular, with a prominent tooth on the lower lip in addition 

 to tlie two lateral denticles ; peristome thin, very much raised, 

 with a deep narrow cleft in front, within which the avicularium 

 is placed ; avicularium small, round ; oooecium rounded, large, 



