24 CATALOGUE OF THE MOLLUSCA 



OsDER. INFEROBRANCHIATA, Cuvier. 



16. PLEUROBRANCHUS, Cuvier. 

 1. P. PLUMULA, Mont. 



Bulla pi umula, Mont. Test. Brit. 214, t. 15, f. 9, and vign, 



2, f. 5. 

 Pleurobranchus plumula, Johns, in Berw. C. Proc. ii. 27. 

 Between tide-marks. Holy Island. — Dr. Johnston. 



Order. TECTIBRANCHIATA, Cuvier. 



Fam. Apltsiadje, D'Orhigny. 

 17. APLYSIA, Linnaeus. 

 1. A. PUNCTATA, CuV. 



Laplysia depilans, Penn. Brit. Zool. iv. 42, t. 21, f. 21. 

 Aplysia mmtelina, Jolins. in Berw. C. Proc. ii. 29. 



On sea-weeds beyond low-water mark, not uncommon ; rare 

 between tide-marks. Cullercoats, Wbitley, 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 inembranaceus ; but as we did not observe any 

 difference in the animal, Ave attribute it to the effect of age. 



This Aplysia is very variable in its markings. It is often 

 blotched and spotted with white. 



Family. Bullid^, UOrhigny. 



IS. BULL^A, Latnarck. 

 1. B. CATENA, Mont. 



Bulla catena, Mont. Test. Brit. 215, t. 7, f. 7. 

 Bullcea 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 Bullcea 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 Bullcea 

 catenulifera, Macg. 



