1879.] ' LIGHTNING ' AND ' PORCUPINE ' EXPEDITIONS. 583 



figured by Seguenza as N. umbonata. This species differs from 

 N. proximo, Say, in shape and sculpture, and is much smaller and 

 less solid. 



6. Nucula reticulata, Jeffreys. (Plate XLVI. fig. 7.) 



N. reticulata, Jeffr. in Ann. and Mag. N. H. Nov. 1876, p. 429. 



'Porcupine' Exp. 1869: St. 16, 19, 20, 21, 23a, 28, 30. 



Distribution. 'Valorous' Exp., 'Challenger' Exp. (off San Mi- 

 guel, Azores) ; 1000-1100 fms. 



N. reticulata of Hanley (from the Philippines) is a species of 

 Leda. 



7. Nucula striatissima, Seguenza. 



N. striatissima, Seg. Nuc. terz. merid. d'lt. p. 6, t. i. f. la-c. 



'Porcupine' Exp. 1870: Atl. St. 17. A single but perfect spe- 

 cimen. 



Fossil. Pliocene. Messina district. 



This is more closely and finely striated than any other known 

 species of Nucula. The N. trigona of Seguenza seems to be a variety, 

 judging from the examination of a specimen which he kindly sent 

 me for that purpose. I do not like the barbarous name striatissima ', 

 but it is more characteristic than trigona, because all the species of 

 the present genus are more or less triangular. Seguenza describes 

 N. trigona as smooth (Icevis) ; but his figure and specimen show 

 that it is closely striated lengthwise. 



t/ 8. Nucula sulcata, Bronn. 



N. sulcata, Bronn, Italiens Tertiar-Gebilde, p. 109 (1831) : B. 

 C. ii. p. 141 ; v. p. 172, pi. xxix. f. 1, la. 



'Porcupine' Exp. 1869: St. 1, 6, 9, Galway B., 13, 17, 18, the 

 Minch, Little Minch, Loch Torridon. 1870 : Atl. 3a, 9, 10, 13, 

 Setubal B., 22, 25, off C. Sagres, 26-30, 36 ; Med. 45, Capo de 

 Grata, Cartagena B., 50, off Jijeli, Benzert Road, Basel Amoush, 

 Adventure Bank, off Rinaldo's Chair. The sculpture varies con- 

 siderably in its comparative coarseness or fineness. 



Distribution. Norway to the iEgean and Sea of Marmora, and 

 the Adriatic ; 5-190 fms. 



Fossil. Miocene, Pliocene, and Post-tertiary. Bohuslan, Caith- 

 ness, N.W. Germany, Biot, Italy, and Rhodes. 



N. polii, Philippi, and other obsolete synonyms. Not N. sulcata, 

 A. Adams, from New Zealand. 



i/ 9. Nucula nucleus, Linne. 



Area nucleus, L. S. N. p. 1143. 



N. nucleus, B. C. ii. p. 143, pi. iv. f. 1 ; v. p. 172, pi. xxix. f. 2. 



'Lightning' Exp.: St. 4. 



'Porcupine' Exp. 1869: St. 1, 2, 6, 9, 14, 18, near Belfast. 

 1870 : Med. Capo de Gata, Rasel Amoush. 



Distribution. Norway to Mogador, and through the Mediter- 

 ranean eastward to the coast of Egypt, and the Adriatic ; 2-145 fms. 



