LMJ) A, 



Plate IV. 



Species 17. (Mus. Cuming in Brit.) 



L.«DA Tayloui. L(Bd. testd alba, lanceolaM, compressd, 

 tenui, fere omnino oblique striata ; latere antico 

 rostrato, ungusto, acuiniiiato, prnpe marginem dm- 

 salem conspicue lirato, margine dorsali rectiusculo, 

 margiiie ventrali versus terminiLm excavalo, medic 

 valde convexo ; latere postico longiusculo, margine 

 dorsedi leviter arciiato, mbdepresso., rix cremdata, 

 ad termiimm uciiminato, margine reiitrali ."ursiiin 

 accliri. 



Taylor's L^da. Sliell vvliito, lanceolate, compressed, 

 tliin, nearly all over obliquely striated ; anterior side 

 beaked, nai-row, acuminated, conspicuously lirated 

 near the dorsal margin ; dorsal margin rather 

 straight; ventral margin excavated towards the 

 end, very convex in the middle ; posterior side 

 rather longer, with dorsal margin sligh.tly arclu^l, 

 rather depressed, scarcely crenulated, acuniinated 

 at the end, ventral margin sloped ii])\vards. 



Haklet. Proc. Zool. Soc, 18C0. 



Nucula lanceolata, Lamarck (not J. Sowcrby). 



Ilab. Guatemala. 



One of the thin lanceolate species, with the ventral 



margin excavated at the anterior side. 



Species 18. (Mus. Cuming in Brit.) 

 LiEDA Metcalfel Lad. testd alba, tenui, lanceolafii, 

 cnrnpressd, oblique striatd ; latere antico subinflato, 



brer, 



ulo. 



prope marginem conspicue rugato, 



oblique depresso, margine ventrali convexo ; latere 

 2>ostico elongato, angusto, ad terminwn acnmiiiato, 

 ad angulim marginis dorsalis crenulato. 



Metcalfe's L^da. Shell white, thin, lanceolate, com- 

 pressed, obliquely striated ; anterior side a little 

 inflated, rather short, near the margin conspicu- 

 ously wrinkled, obliquely depressed, with ventral 

 margin convex ; posterior side elongated, narrow, 

 acuminated at the end, crenulated at the angle of 

 the dorsal margin. 



Hajiley. Proc. Zool. Soc, 1870. 



Nucula crenifera, Hanley (not Sowerby). 



Hab. Philippines. Cuming. 



the end, umbocs elevated. 

 Donovan {Area). British Shells, pi. 

 Area mimita, Montagu. 

 Nucula rostrala, Sowerby. 

 iSembidiis sulcatum, Leacli. 

 jMula intermedia, Oersted. 

 IJiib. Great Britain. North Euro])( 



Species 20. (Mus. Taylor.) 



L.eI)A ap.CUAta. La,/, testd albil, te„,ii, cmupi-issd, 

 elongato-lanceoldtd, subobliqu!: tenuissiine striatd ; 

 latere antico bi-eriusculo, margine rix dcclivi, rec- 

 tiusculo, minute et acute crenuh,!,) : /otc; puMii-o 

 angustiusculo acuminalo, margine i/iu-^ali i/,jiir.^.^,i, 

 minutissime crenulato, ad tern,i„„,ii iliral,' : niiir- 

 gine ventrali antice et postii'e a;qu(diter airuato. 



The AnciiED Lj.da. Shell white, thin, compressed, 

 elongated, lanceolate, a little obliquely finely 

 striated ; anterior side rather short, with the 

 margin scarcely sloped, rather straight, minutely 

 and acutely crenulated, elevated at the end ; 

 ventral margin anteriorly and posteriorly equally 

 arched. 



Sowerby. 



Hub. ? 



In Lceila Taylor 

 is a peculiar narr 

 the ventral margi 

 iu Laida arcuata. 



, which resembles this species, there 

 iwness and almost a constriction in 

 at the anterior end not observable 



September, 1871. 



