On the Vohjzoa of the St. Lawrence. 140 



Tliis appears to be the species referrecl with doubt by Canon 

 Tristram * to " Psammovnjs taniaracinus, Kuhl," but is 

 certainly not the true Meriunes tamaricinus, Pall., a very 

 much larf:;cr and heavier animal. Its nearest ally is jjcrhaps 

 31. ineridianuSj Pali. ; but neither that nor any other species 

 with which 1 am acquainted has such a narrow slender skull, 

 so little broadened posteriorly. Its small and narrow bullai 

 also distinguish it from all its allies. 



XXVI. — The Poli/zoa of the St. Laiorence: a Study of Arctic 

 Forms. By the Ilev. Thomas Hincks, B.A., F.R.S. 



[Plate VIII.] 



[Coutinued from vol. iii. p. 433.] 



Flustra soli'da, Stimpson. (PI. VIII. figs. 1.) 



Fhfstra solida, Stimpson, Marine Invertebrata Grand Manan, ISoS; 



Hincks, " rolyzoa from Barents Sea," Ann. & Mag. Nat. Ilist, 1880, 



ser. 5, vol. vi. p. 282, pi. xv. figs. 2, 3. 

 Escharu palmafa, Sars, Beskriv. over nogle norske Polyzoer, 1862. 

 Escharella palmata, Smitt, Krit. Fiirteckn, ofver Skand. Hafs-Bryozoer, 



1867. 

 Flustramorpha solida, Verrill, Proc. U.S. Nat. Mus. 1879. 



This very interesting species occurs amongst the St.- Law- 

 rence dredgings ; it was obtained off Bear Head, Anticosti, 

 at a depth of 120 fathoms. Besides the form described by 

 Sars a small variety was met with which presents some 

 notable peculiarities, to which I shall refer hereafter. 



Zoarium erect, bilaminate, branched, attaining a height of 

 about 3 inches, in the adult state composed of broad trans- 

 versely separated segments, held together by epidermal tubu- 

 lar fibres, which traverse the surface of the zoarium and unite 

 in their course downwards, so as to form cords of many strands, 

 and ultimately give origin at the base to the fibrils by which 

 the colony is attached to its site. Zooecia linear-oblong, 

 narrow, and usually of great length, inclosed by strongly 

 marked boundary-lines and perforated round the sides, very 

 moderately convex, surface smooth, comraoidy invested by 

 an epidermal membrane, orifice broader than high, upper 

 margin very slightly arched, sides nearly straight, lower 

 margin decidedly curved outward, an articular process at each 



* P. Z. S. 1866, p. 89. 



