NUCULA.— Plate II. 



centre, dorsal margin eonvexly sloped as far as the 

 termination, ventral margin sloped upwards, con- 

 vex in the middle ; umboes subterminal, elevated, 

 anterior side truncated, lunule scarcely convex. 



Hanlet. Sowerby's Thesaurus Conchyliorum, Nucula, 

 sp. 4, f. 123, 124. 



Area nucleus, Turton. 



Nvcula Mar/aritacea, Sowerby. 



ffab. Britain ; S. Europe. 



More compressed and more obliquely produced than 

 Nucleus. Some specimens occur in which the cuticle 

 is very dark, totally obscuring the rays. 



Species 13. (Mus. Cuming in Brit.) 



Nucula GrtAYi. Nuc. testd ovatd, valde iransversd, 

 utrinque suhacuminata, tenui, subinflatd, niti- 

 dissimd, olivaced, latere jyoslico producto, ared 

 dorsali compressd, elevatd, subaliBformi, termino 

 acuminato ; latere antico suhproducto, cuneato, 

 lunuld brevi, circwmscriptd. 



Grat's Nucleus. Shell ovate, very transverse, slightly 

 acuminated at both ends, thin, rather inflated, 

 very smooth, olive ; posterior side produced, 

 dorsal area compressed, elevated, subaliform, end 

 acuminated ; anterior side a little produced, 

 cuneated ; lunule short, defined. 



D'Orbignv. Amerique Jleridionale, p. 53. 



Hah. New Zealand. 



Species 14. (Mus. Cum. in Brit.) 



Nucula obliqua. Nuc. testd solidd, magnd, oblique 

 ovatd, subcompressd, sublcevigatd, hand radiatd, 

 intiis argented ; latere posiico ovato ; latere antico 

 truncato, umbonibus terminalihus. 



The oblique Nucula. Shell solid, large, obliquely 

 ovate, subcompressed, rather smooth, not rayed, 

 silvery within; posterior side produced, ovate, 

 anterior side truncated, umboes terminal. 



Lamarck. Animaux sans vertebras. 

 Ilab. Australia. 



A larger and more solid shell than Nuctda radiata, 

 and more ovate in general form. It is not at all 

 rayed. 



Species 15. (Mus. Sowerby.) 



Nucula Stkasgel Nuc. testd obliqud, tenui, ohlongd, 

 aureo-subolivaced, nitidd, vix concentrice striatd ; 

 latere postico producto, margine dorsali compressd, 

 subulatd, margine ventrali post medium convexd ; 

 latere antico angustiusculo, brevi, cuneato, lunuld 

 parvd. 



Steange's Nucula. Shell oblique, thin, oblong, 

 golden-olivaceous, smooth, scarcely concentrically 

 striated; posterior side produced, dorsal margin 

 compressed, subulate, ventral margin convex past 

 the middle, anterior side rather narrow, short, 

 cuneated, lunule small. 



A. Adams. Proc. ZooL Soc, 1856, p. 52. 



Ilab. New Zealand. 



Species 16. (Mus. Sowerby.) 



Nucula nitida. N'uc. testd oblique subtrigond, sub- 

 compressd, luted, griseo fasciatd, obsolelissime con- 

 centrice el radiatim striatd, latere postico subacu- 

 minato, margine dorsali vix arcualo, declivi, 

 margine ventrali leviter convexo; umbonibus 

 elevatis ; latere antico in/rd, cuneato, lunuld 

 indistinctd. 



The shining Nucula. Shell obliquely subtrigonal, 

 subcompressed, yellowish, banded with grey very 

 obsoletely concentrically and radiately striated, 

 posterior side subacuminated, dorsal margin 

 scarcely arched, sloped, ventral margin slightly 

 convex, lunule indistinct. 



SowEiiBY. Conchologicd Elustrations, Nucula, No. 29. 



Ilab. Britain, ttc. 



