PLATE XXI. 
PIG. JIL Ti. 
PATELLA RETICULATA. 
RETICULATED MASK LIMPET. 
SPECIFIC CHARACTER 
AND 
SYNONYMS. 
Small, ash colour, reticulated. Vertex perforated. 
P. LARVA RETICULATA. Patella parva cinerea, vertice perforata. 
Da Costa Br. Conch. p. 14. sp. 7. 
‘PATELLA Graca. STRIATED. Penn. Br. Zool. No. 153. tab. 
89. fig. 153. 
PATELLA CLATHRATA. A lein. Ostrac. p. 116.—284. No. 2. 
Last. H. Conch. tab. 527. fig. 2.? 
Pennant says, this species inhabits the west of England, The 
specimens in Da Costa’s collection were also fished up near Wey- 
mouth, in Dorsetshire. This is a rare Shell, and is not known to in- 
habit any other of the British coasts. 
This Shell is about three quarters of an inch in length, half an 
inch in breadth, and one quarter of an inch in heighth. The out- 
side 1s deeply reticulated, or wrought with prominent longitudinal and 
transverse ridges. The vertex inclines to one end, and is perforated ; 
its aperture is of an oblong form, and about one tenth of an inch in 
length. 
