Clare Island Survey — Marine Entomostraca. 45 17 



0. pelagica Farran. — I use this name for the species usually recorded from 

 the north-east Atlantic as 0. plumifcra, although it appears to be 

 specifically distinct. It is an oceanic form, but occurred a few times 

 in the open sea off Cleggan in 1901. 



Cyclops aequoreus Fischer. — Clifden Bay (B. & E.). 



Family MONSTRILLIDAE. 



*Thaumaleus rostratus Scott. — Off Inishbofin Harbour, 1900, two females. 



*T. rigidus (I. C. Thompson). — Ballynakill Harbour, 1901-2, tow-nets 

 1-2 fms., four females, lengths, 2'l-2'7 mm. These specimens agree in 

 size and proportion with T. rigidus as re-described by T. Scott. The last 

 two segments of the abdomen are, however, completely separated — not 

 partially as in Scott's specimens. 



Family ASCIDICOLIDAE. 



*Ascidicola rosea Thorell. — Blacksod Bay, March, 1911, 2 fms., one in 



Cynthia sp. 

 Notodelphys Allmanni Thorell. — Killary Bay (Brady, Mon.). Blacksod 



Bay, September, 1911, from Ascidia mentula between tide- marks. 

 *Notopterophorus elongatus Buchholz. (Dorypygus auritus). — Blacksod Bay 



between tide-marks, September, 1910, in Ascidiella aspersa ; September, 



1911, in Ascidia mentula. 

 *Notopterophorus papilio Hesse. — Ballynakill, 1902, in Ascidia mentxda, many. 



These agree with the form figured by Scott, in which the wings are not 



greatly developed. 

 *Enterognathus comatulae Giesbr. — Taken a few times in Ballynakill Harbour 



in 1901, parasitic in Antedon rosea dredged in about 5 fms. The parasite 



is to be found lodged in the anal extremity of the intestine of the 



Antedon with the furcal rami projecting into the open. When disturbed 



it withdraws itself completely within the body of its host. 



Family ASTEROCHERIDAE. 



Asterocheres lilljeborgi Boeck. — Westport Bay, on a sponge (B. & B,). 



Dermatomyzon nigripes (Br. & Rob.). — Ballynakill, 1902, 3-8 fms., one. 

 *Rhynchomyzon purpurocinctum (Scott) — Ballynakill, 1901,4-6 fms., one. 



Acontiophorus scutatus (Br. & Rob.). — Clifden Bay, on Laininaria fronds, type- 

 specimen (B. & E.). "Westport Bay (Brady, Mon.). Ballynakill, 1902, 

 3-8 fms., one. 



K. I. A. PROO., VOL. XXXI. C $5 



