STEPHENSON — Certain Actiniaria collected off Ireland. 135 



undulate in outline; upper part of body provided with adhesive suckers. 

 Mesenterial musculature strong, retractors diffuse. Cinclides scattered. 

 Margin tentaculate. 



13. C. pedunculatus Penn. 

 (Sagartia bcllis Ellis and Solander, &c.) 



St. VII. Feb. 28, 1899. Ballynakill. Coastguard Bay. Shore collection. 

 9 specimens. (Also one small specimen of another species.) 



It may be of interest to record that the one specimen which I sectionized 

 is hermaphrodite. Well-developed ova and testes are present at the same 

 level in one and the same mesentery. 



Sub-family METRIDIINAE Carlgren. 



Sagartiidae with six (rarely a few more) pairs of perfect mesenteries, 

 which are sterile; one or more siphonoglyph.es ; body-wall relatively thin, 

 without a cuticle ; cinclides present ; sphincter mesogloeal. 



Calliactis Verrill. 



Metridiinae with body of typical more or less cylindrical form, sometimes 

 with a widely expanded base; wall smooth, except for the cinclidal tubercles 

 in some species; cinclides in horizontal rows at the base of the column. 

 Six pairs of perfect mesenteries. No collar. Disc not lobed, though some- 

 times a little undulated in a living animal. Longitudinal musculature of 

 tentacles ectodermal or meso -ectodermal. The species are usually commensal 

 with hermit crabs. 



14. C. rondeletii D. Ch. 



[Sagartia 'parasitica Couch, &c.) 



R. 1. March IS, 1904. Trawl off Dungarvan. About 5| miles S.S.E. of 

 Helvick Head. 27-28 fathoms. Six specimens. 



Four of the specimens are attached to one Gastropod shell ; one is on 

 another shell, and the last is loose. 



Adamsia Forbes. 



Metridiinae in which the smooth column is short and fiat, and modified 

 into two great lobes, which completely enclose a gastropod shell inhabited 

 by a hermit crab ; the lobes unite where they come in contact, and give the 

 body a ring-like form. The pedal disc secretes a tough cuticle. Cinclides 

 in one or several horizontal rows near base of column. 



