608 Proceedings, of the Royal Irish Academy. 



tI. "Eillala Bay, one perfect specimen and single valves (Miss A. 

 "Warren, '92) : Inisbarnog, co. Donegal (Mrs. Tatlow, '99). 

 Distrilution. — Finmark to Mediterranean. Azores. W. Afn'r-a. 

 Madeira. Canaries. C. Yerd I. 



\_Arca oniqua, Philippi.] 

 .... v., . 



V. "Porcupine" Exp., 1869, 173-422 fms. (Jeffreys, '79). 



Distribution, — Norway to Mediterranean. Azores. Josephine 

 Bank. 



Area pectunculoides, Scacchi, 



• . iii-, iv., [v.], . 



iii. Off Cape Clear, 45 fms., a living specimen and a valve (M'Andi'e^v, 



f. Thompson, '56). 

 17. " PorcniDine " Exp., 1869, 85-110 fms. (Jeffreys, '79): Pt. I. A. 

 Exp., 1885, 35-110 fms. (Chaster, '98): E. I. A. Exp., 1886, 

 93 fms., living (A. E. N.). 

 V. West of Ireland, 100 fms. (King, '62, Jeffreys, '63): "Porcu- 

 pine" Exp., 1869, 173-422 fms. (Jeffreys, '79). 

 Distrilution. — Arctic seas in both hemispheres to Mediterranean 

 and West Indies. Morocco, "Talisman" (Locard), Madeii'a (Watson). 



Pectimcidus ghjcymeris (Linne). 

 i., ii., iii., iv., v., vi. 

 Generally distributed round the coast from low-Tvater mark to about 

 100 fms., and often gregarious. 



Distribution. — Einmark to Mediterranean. W. Africa. Madeira. 

 Canaries. N. Japan. 



l^Glornus nitens, Jeffreys.] 

 .... v., . 

 V. "Porcupine" Exp., 1869, 816 fms. (Jeffreys, '79). 



Distriiution. — Both sides of ISTorth Atlantic. Off the Eio de la 

 Plata, " Challenger." Deep "svater. 



\_Silicida fragilis, Jeffreys.] 



v., . 



V. "Porcupine" Exp., 1869, 816 fms. (Jeffi'eys, '79). 

 Distribution. — !N"orth Atlantic. Deep water. 



