LIST OP LABRADOR MARINE ANIMALS. 407 



truncate behind, or with a broad shallow sinus. The ovi-capsules 

 globose, subrugose, sub-punctate, much as in the British specimens. 

 Found growing in purple patches. Length -~- of an inch, half as 

 broad as long. 



What I take to be a second and larger form of this species has 

 the cells large, oblong, oval, convex, being closely connected with 

 the ones before and behind in radiating lines. The surface has 

 coarse emarginatad punctures. In old specimens the punctures are 

 so large that the surface is often but a network enclosing them 

 Apertures round, slightly raised, with a deep narrow sinus, 

 at the entrance of which are two denticles, one on each side, which 

 often become obsolete. In some cells the surface is perfectly 

 smooth, and only the marginal punctures present. 



Specimens from Greenland do not differ. It is much larger than 

 the preceding form, which is ^ of an inch long, and arranged in more 

 regular rows, and preserves better its oblong, oval, convex form. 

 The • ovi-capsules are emarginato-punctate, and proportionally 

 smaller and smoother than in the preceding form. 



I have also specimens on Pecten islandicus from the Newfound- 

 land bank. 



L. producta n. sp. (Fig. 1.) Cells oval, convex, coarsely 

 punctate ; in the young the punctures are emarginate, the base of 

 the cell is produced and wedged in between adjacent ones. 

 Aperture broad, round, with a moderately large and deep sinus in 

 the young ; in older cells, small, round, truncate behind, horse- 

 shoe shaped ; margin full, broad, unarmed, and when the cells 

 are crowded, the margin in front expands upon the base of the 

 cell in front. Cells arranged in lines, soon becoming very irregu- 

 lar, and partially radiating ; forming white, but more generally 

 purple patches. Length ^\ of an inch. Old specimens are flattened, 

 granulated with marginal punctures ; very rarely the aperture 

 has a small sinus. It is the largest species observed. Frequent. 



As in the preceding species, there are two forms which might 

 easily be mistaken for as many species. The young cells are 

 rounded, ovate, depressed and with emarginate punctures, while 

 the apertures are sinuate. With the other form the species becomes 

 the largest of the genus yet observed on this coast, being one 

 thirtieth of an inch long. The cells are much thickened, convex, 

 in outline often pyriform, owing to the elongation of the base of 

 the cell ; and the aperture is small and truncate behind. 



In both forms the surface is more than usually rugose. 



