N U C U L A. 



Plate III. 



Species 17. (Fig. a, b, Mus. Sowerby.) 



NucuLA PROXIMA. Kuc. tcstd parviusculd, crassd, snh-^ 

 tngond, elevatd, ventricosd, oUvaceo-cinered, minute 

 concenirice liraid; latere postico oblique subacu- 

 minato, angidato, post aream subplanato, umhonibus 

 tumidis, elevatis, subterminalibus ; latere antico 

 angusto, brevisdmo, lunuld prominenti, brevi, sulco 

 circtcmscriptd. 

 The NEiGiinouiUNC. Nl-cvla. 8h<-ll ratlicr small, thick, 

 rather trigonal, elevated, ventricose, ashy-olive, 

 minutely concentrically lyrated; posterior side 

 obliquely subacuminated, angular, rather flattened 

 behind the angle ; lunboes tumid, elevated, sub- 

 termiual; anterior side narrow, very short, lunule 

 prominent, short, circumscribed by a groove. 

 Say. Journal of Natural History Society, Philadelphia, 



vol. ii. p. 270. 

 Hub. N. America. 



The chestnut Nucula. Shell very oblique, short, 

 elev.ated, compressed, smooth, chestnut-coloured : 

 posterior side much sloped, subacuminated below ; 

 umboes smaU, terminal ; anterior side sloped up- 

 wards at the ventral margin, lunule small. 



A. Adams. Proc. Zool. Soc, 185G, p. 53. 



Hub. New Zealand. 



Species 18. (Fig. a, b, Mus. Cuming in Brit.) 



Nucula delphinodenta. Xuc. tesld minuld, subobliqud, 

 gubtrigmid, brevi, altd, ventricosd, la-vigatd, concen- 

 irice minute striatd; umbonibus prominentibus ; 

 latere postico subrotundo ; latere antico bremsimo, 

 hiMuld ampM, elongata. 



The Dolphin-toothed Nucula. Shell minute, sub- 

 oblique, subtrigonal, short, elevated, ventricose, 

 smooth, concentrically minutely striated; umboes 

 prominent; posterior side somewhat rounded; 

 anterior side very short, lunule full, elongated. 



Mighels. Boston Journd of Natural History, iv. p. 40. 



Hab. N. America. 



Species 20. (Mus. Cuming in Brit.) 



Nucula tenuis. Nuc. testd ovatd, inflatd, tenui, niti- 

 dusimd; latere postico oblique ihclivi, margine 

 dorsnli subangulato, subarcuato, termino subacumi- 

 naio ; latere antico brevissimo, lumdd haud pro- 

 minenti, elongatd. 



The thin Nucula. Shell ovate, inflated, thin, very 

 shining; posterior side obliquely sloped, dorsal 

 margin angular, slightly arched, end subacumi- 

 nated; anterior side very short, luniUe not pro- 

 minent, elongated. 



Montagu. Testacea Britannica, sup. p. 5G, pi. 29, f. 1. 



Hah. Britain, Europe. 



Species 19. (Mus. Cuming in Brit.) 

 Nucula castanea. Nuc. testd perobliqud, brevi, ele- 

 vatd, compressd, laevigata, castanea; latere postico 

 valde declivi, infra subacuminatd ; umbonibus 

 pa^vis, terminalihus; latere antico ad margmem 

 ventralem acclivi, lunuld parvd. 



Octolier 



Species 21. (Mus. Cuming in Brit.) 

 Nucula simplex. Nuc. testd ovatd, lavigatd, pallidd, 

 fenuissimd, injlatd ; latere postico producto ; mar- 

 gine dorsali declivi, convexa ; latere antico brevts- 

 simo, truncato, umbonibus parvis, terminalibus ; 

 lunuld parvd, brevi 



The simple Nucula. Shell ovate, smooth, pale, very 

 thin, inflated, posterior side produced, dorsal mar- 

 .^in 'sloped, convex, anterior side rather short, 

 truncated, umboes small, terminal, lunule small, 

 short. 



A. Adams. Proc. Zool. Soc, 185G, p. 52. 



Hub. Sidney, Australia. 



Species 22. (Fig. a, b, Mus. Sowerby.) 

 Nucula paulula. Nuc. testd minutd, elevatd, oblique 

 subtrigond, Icsvigatd, tenuissimd, mbcinered ; latere 

 postico valde declivi, prope marginem dorsalem an- 



. 1870. 



