REPORT ON THE LAMELLIBRANCHIATA. 25 



Station 321.— February 25, 1876; lat. 35° 2' S., lung. 55° 15' W.; depth, 13 fathoms; 

 bottom, mud (mouth of the Rio de la Plata). 



Cytherea (Caryatis) rostrata, 



Koch 

 Tellina (Macoma) uruguayensis, 



n. sp. 



Mactra {Trigonella) isahelliana, 



d'Orbigny. 

 Periploma compressa, d'Orbiguy. 

 Nucula uruguayensis, Smith. 



Station 322.— February 2G, 1876; lat. 35° 20' S., long. 53° 42' W.; depth, 21 fathoms; 

 bottom, sand, shells (off the mouth of the Rio de la Plata). 



Mytilus edulis, Linne. | Plicatula r-ainosa, Lamarck. 



Station 323.— February 28, 1876; lat. 35° 39' S., long. 50° 47' W. ; depth, 1900 fathom.s; 

 bottom, blue mud (east of the preceding Station). 



Glomus nitens, Jeffreys. 



Station 325.— March 2, 1876 ; lat. 36° 44' S., long. 46° 16' W.; depth, 2650 fathoms; 

 bottom, blue mud (farther east than Station 323). 



Silenia sarsii, n. sp. 



Station 344.— April 3, 1876; lat. 7° 54' 20" S., long. 14° 28' 20" W.; depth, 420 

 fathoms ; bottom, volcanic sand (off Ascension Island). 



Cryptodon sp. | Leda Jeffrey sii, Hidalgo. 



Station 348.— April 9, 1876; lat. 3° 10' N., long. 14° 51' W.; depth, (2450) fathoms; 

 bottom, Globigerina ooze (south of Sierra Leone). 



Callocardia (f) adamsii, n. sp. 



(ZOOL. CHALI.. EXP. — PART XXXV. — 188-5.) Mm 4 



