yOLDIA.— Plate II. 



Species 8. (Mus. Cum. in Brit.) 



YuLDiA Japonica. Yol testa suhovatd, suha-quilateraU, 



pallidd; latere postieo longimcido, subarcualo, 



suhacuminato, manjine dorsali depresso, lunula 



angusld acute definila ; margine ventrali medio 



recliksculo, utrinque valde sursuvi acclivi ; latere 



antico breviusculo, subacuminatim in-odiicto. 



Tm; Jai'an Yiildia. Shell subovate, subffiquilateral, 



pale ; posterior side a little longer, a little arclied, 



subacuminate ; dorsal margin depressed, lunula 



narrow, sharply defined ; ventral margin nearly 



straight in the middle, much sloped upwards at 



both ends; anterior side rather shorter, subacu- 



minately produced. 



Adams and Reeve (Xucula). Zool. Samaraug, Mol- 



lusca, 75, PL 21,/ 9. 

 Nah. Japan. 



This .*;peci 

 ends. 



iarlv curved upwards 



Species 9. (Fig. a, b, ' 



5rit.) 



DiA Myaus. YoL testa ovatd, valde incequilalerali, 

 lata, convexd, epidermide fusco, nitido, olivaceo, 

 zonis saturatioribus indutd, latere postieo breve, 

 acuminato, area dorsali imjiressd, hand circum- 

 scripCd, inargine dorsali declivi, depresso, ad ter- 

 minum breviter trtincato, margine ventrali arcuatim, 

 siirs-um acclivi; latere antico producto, versus 

 teriiiimim subattemuxlo. 



Myal's Yoldia. Shell ovate, very inequilateral, 

 broad, convex, covered with a brown, shining, 

 olivaceous epidermis with deeper bands, posterior 

 side short, acuminated, dorsal area impressed not 

 defined ; margin sloped, with a short truncation 

 at the end ; ventral margin sloped upwards in a 

 curve ; anterior side produced, a little attenuate 

 towards the end. 



CouTHOY {Nucula). Bost. Journ. Nat. Hist., ii. p. G2. 

 PI. 3,/. 219. 



Ilab. Singapore. Philippine Islands. 



Species 10. (Fig. a, b, Mus. Sowerby.) 



Yoldia outusa. Yol. testa oblongd, compressd, valde 

 inwquilaterali ; epidermide nitenti oUvaceo-lutes- 

 centi indutd ; latere postieo brevi, retuso, termino 

 elevato, subacuminato, margine vetitrali prope 

 term'mum acclivi, vix conlracto : latere antico 

 elongato. 



The obtuse Yoldia. Shell oblong, compressed, very 

 inequilateral, covered with a shining yellowish- 

 olive epidermis; posterior side short, retuse, with 

 the end elevated, subacumiiiated, ventral margin 

 sloped upward, scarcely contracted, anterior side 

 elongated. 



SoWEfiBY. 



Hab. ? 



More narrow in iirojiortion to its length than Yoldia 

 Myalls ; the posterior side still shorter and narrower 

 than in that species, with the end less truncated. 



