118 CATALOGUE OF THE MOLLUSCA 
Orpver. INFEROBRANCHIATA, Cuvier. 
16. PLEUROBRANCHUS, Cuvier. 
1. P. prumuLa, Mont. 
Bulla plumula, Mont. Test. Brit. 214, t. 15, f. 9, and vign. 
2, f. 5. 
Pleurobranchus plumula, Johns. in Berw. ©. Proc. ii. 27. 
Between tide-marks, Holy Island.—Dr. Johnston. 
OrpEeR. TECTIBRANCHIATA, Cuvier. 
Fam. Aptysrapa, D’Orbigny. 
17. APLYSIA, Linneus. 
1. A. punctata, Cuv. 
Laplysia depilans, Penn. Brit. Zool. iv. 42, t. 21, f. 21. 
Aplysia mustelina, Johns. in Berw. C. Proce. 1. 29. 
On sea-weeds beyond low-water mark, not uncommon ; rare 
between tide-marks. Cullercoats, Whitley, and Newbiggin. 
A specimen got at Newbiggin had the horny dorsal plate lined 
with a thin coating of shelly matter, not unlike what is seen in 
Pleurobranchus membranaceus ; but as we did not observe any 
difference in the animal, we attribute it to the effect of age. — 
This Aplysia is very variable in its markings. It is often 
blotched and spotted with white. 
Famity. Buuiipm, D’Orbigny. 
18. BULLZGA, Lamarck. 
1. B. carena, Mont. 
Bulla catena, Mont. Test. Brit. 215, t. 7, f. 7. 
Bullea catenata ? Thorpe Brit. Mar. Conch. 138. 
In shell sand, frequent. Tynemouth, Whitley, Newbiggin, 
and Cheswick. It has not been found alive on this coast, but 
appears to inhabit the Laminarian zone. 
The description of Bullwa catenata, in Thorpe’s “ British Ma- 
rine Conchology,” agrees with this species, being a slight altera- 
tion of Montagu’s, but the figure is that of B. pectinata, which is 
the Scaphander catenata of Leach. ‘The latter species is described 
in the Addenda to the same work, under the name of Bullewa 
catenulifera, Macg. 
