Stephenson — Certain Actiniaria collected of Ireland. 149 



Head. Lat. N. 53° 36' 30" ; Long. W. 11° 15' 30". 74i fathoms. Dredg 

 1 specimen, with 3 Adamsia palliata. 



17. S.E. 188. Feb. 3, 1905. 50 miles W. \ X. of Tearaght Light. Lat. 

 X. 51° 53'; Long. W. 11° 59'. 320-372 fathoms. Trawl. 5 specimens, 

 with 2 Boloccra. 



18. Unlabelled bottle. 2 specimens, on Gastropod shells. 



19. Unlabelled bottle. 5 specimens. 



The above list includes 205 specimens, taken in seventeen ditl'erent hauls. 

 Unfortunately I have been unable, up to the time of writing, to investigate 

 the anatomy of this large group of specimens as fully as I hope to do in the 

 end, and consequently the following account will deal with external characters 

 only, for the most part; but when I can, I shall make an account of the 

 anatomy separately. 



The anatomy, so far as I have carried it, is somewhat puzzling, but it does 

 not preclude the possibility of all the forms in question belonging to one 

 species, allowing for variation. At all events, all of them belong without 

 doubt to the genus Actinaugc, and many of them certainly to the species 

 richardi; if any cases are doubtful, they are not referable to either of the 

 other known species, but are new forms closely allied to richardi. The con- 

 stancy with which a certain combination of characters, to which I shall refer 

 below, runs through the whole series, is remarkable, I may state, as regards 

 anatomy, that, for instance, there is no essential or first-rate difference as 

 far as structural features are concerned, between the two types illustrated in 

 PL XIV, figs. 3 and 9. 



Measu/rements of a typical specimen. — Diameter of mouth of basal cup, 

 3 cm. ; of middle of column, 2 - 3 cm. ; of oral disc and tentacles, 3 - 5 cm. ; total 

 height of animal, 3"7 cm. ; depth of basal cup, ca. 1*5 em.; thickness of wall in 

 middle of a tubercle, - 5 cm. ; length of a large tentacle, ca. - 7 cm. 



I. It may be as well, first of all, to give a general description of what may 

 be considered as the typical form; such a form, that is to say, as is figured in 

 PI. XIV, fig. 3. A specimen identically like the one figured agrees well as 

 far as anatomy (as well as external characters) is concerned, with the figures 

 and description of A. richardi given by Haddon. Xone of my specimens 

 shows quite such markedly prominent capitular ridges as his figure does, but 

 otherwise they agree with the essentials in bis description. In this typical 

 form, the base is developed as a sand-enclosing cup or bulb. The column is 

 divided clearly into two parts — the lower and more extensiw scapus, which 

 is provided with tubercles, many of which possess cuticle — and the upper and 

 smaller capitulum. The capitulum is free from cuticle, and is smooth in texture. 



