314 MR. E. A. SMITH ON THE [ Apr. 1 , 



Lvcina pec/en, Reeve (non Lamarck), Conch. Icon. pi. 7. figs. 34, 

 35 a-b. 



Lucina occidentalis. Reeve, Conch. Icon. Index, Errata. 



Hab. Various islands in the West Indies, also Cape Verde Islands 

 (P. Furse in Brit. Mus.). 



This species greatly resembles L. fibula Reeve, from the Philippines, 

 Red Sea, &c., but tlie radiating ridges do not divaricate on the dorsal 

 margins in the same manner. L. mimda, A. Adams (Proc. Zool. 

 Soc. 185.5, p. 225), is the same species as L. fibula. 



Mytilus edulis, Linne? 



Two or three small specimens collected by Mr. Melliss have been 

 referred to this common species by JeiFreys. They were " found 

 attached to long pieces of seaweed " which drift on shore at Sandy 

 Bay beach on the south coast (Melliss), so probably had been carried 

 northward from S. Africa. They might with equal propriety be 

 referred to M. compressus, Phil., or M. meridionalis, Krauss. 



Mytilus magellanicus, Chemnitz. 



Both Mr. Melliss and Capt. Turton obtained this form from sea- 

 weed. The specimens are all small, about an inch in length, and 

 show considerable variation in the number and coarseness of tlie 

 ribs. The colour varies from yellow to purplish. 



MoDiOLARiA marmorata (Forbcs). 



Hah. Gt. Britain, INIediterranean, Canary Islands. 



According to Jeffreys this species also occurs in the Gulf of Suez, 

 the Persian Gulf, and N. Pacific. The specimens from St. Helena 

 collected by Capt. Turton are vividly mottled, but agree in form 

 and sculpture with Euro])ean specimens. 



(3RENELLA PURA. (Plate XXIV. fig. 26.) 



Testa minuta, cequilatcralis, triangularis, inferne arcvata, alba ; 

 valvar mediocriterconvexa, crassiusculce, radiatim aon/iiste sulcata', 

 sidcis ivterstitiis an(/nstio7-ibvs, liyieis iticrementi striata;; margo 

 dorsi utrinque valde dedivis, subrectilinearis ; xmibones promi- 

 nentes ; linea cardinis valida, infra etjjove umbones transversim 

 striata, sulco angusto ligamentalipostice ohliquo sculpta ; pagina 

 interna nitida, alba, baud margaritacea, margine inferiori plus 

 minus denticulato, dtntilms 2-S validis ad extremitatem posticam 

 Unece cardinalis instructa. 



Longit. 3 milUm., alt. 3^, diam. 2. 



This little species for its size is rather sohd, and peculiar on 

 account of its hinge-plate, and the two or three denticles at the 

 posterior end, just within the margin of the valves. 



Pecten pusio, Linn. 



Eab. Mediterranean to Norway and Faroe Isles, Madeira, Canaries, 

 Azores, S. Africa. 



This species has been quoted from South Africa both by Jeffreys 



