VENUS. H5 



attention of naturalists to the important consideration of 

 nomenclature, and to prevent, at least, additional error, if it 

 be impossible to rectify the present barbarisms. 



Section I. Three strong teeth in each valve. 



VENUS, Linnajus. 

 V. FASCIATA, Donovan. 



V.fasciata, Brit. Moll. i. p. 415, pi. 23. f. 3, and pi. 26. f. 7 ; (ani- 

 mal) pi. L. f. 7. 



Animal compressed, body flake-white ; mantle open, thick 

 and muscular, bordered with fine white fringe. The siphons 

 are very short, soldered on each other, just separate at their 

 extremities ; the anal is the smaller, slightly curving upwards, 

 furnished with a flexible hyaline valve, and fringed at the 

 orifice with about fifteen plain white cirrhi ; the branchial has 

 twenty rays of similar cast ; both the tubes are of a pale 

 sulphur-yellow, with flaky markings and margined with a 

 fine red line, and are aspersed from their bases with minute 

 sand-like red points. On each side there are a pair of pale 

 brown suboval branchiae, the upper being much the smaller 

 and strongly striated on both surfaces ; the palpi are small, 

 pointed and triangular, externally smooth, but striated across 

 the inner surface. The foot, at rest, is securiform, apparently 

 scarcely detached from the body ; when extended but it is 

 rarely seen so it is thick, moderately long, and lanceolate. 

 The colour pure white. 



Common, alive, in the coralline zone at Exmouth. 



V. STRIATULA, Donovan. 



V. striatula, Brit. Moll. i. p. 408, pi. 23. f. 4, and pi. 24. f. 4, and 

 pi. 26. f.9, 10, 11. 



Animal white ; mantle open throughout the ventral range, 

 having the margin fringed with short fine white filaments. 

 The siphons are rather slender, and when extended are about 



