COS MESSES. E. HEEON-AI,LEN AND A. EAELAKD ON THE 



"Whilst these pages have heeii passing through the press, we have dealt with the question of the identit}' of 

 VanhoefeneUa yaussi Khumbler wiih one of the abnormal forms of Iridia diaphana [Proc. Zool. Soc. (Lond.) 1 915, 

 p. 2iJ6]. We now have to consider the question of the relationship of /. diaphana vf ith iSquamidina varians 

 Carter (AMjS'H. ]870, ser. 4, vol. v. p. .321, pi. v. figs. 1-5). Carter's figures are very diagrammatic, and his 

 description, though voluminous, is by no iLeans clear. At first sight, the early stages o£ S. varians appear 

 to be very similar to those of i. dia^ihana, the test being hemispherical and attached, and with a chitinous 

 foundation ; but Carter considers the prominent lateral aperture as specificallj' esseutial, whereas in /. diajjTiana 

 an aperture of any kind is rare. The rough surface studded with projecting spicules is never observed in 

 Dritish or tropical /. diapJuma, nor has it the everted rim attaching it to the host. Specimens in the Millett 

 Collection, named Flacopsilina varians after Carter's species, are identical with the young I. diapliana origiually 

 recorded by us from Selsej' as Webbina hemispherica, and show none of the above-mentioned features oiS. varians. 

 Carter's figures of the adult form are merely sectional diagrams, and it is impossible to identify them either 

 with his young stage or with /. diapliana as figured by us, though their appearance (especially fig. 5) strongly 

 suggests the latter, but there seems no reason for connecting his young and adult forms. Brady transferred 

 S. varians to the genus Flacopsilina, as Squamidina is unquestionably allied to the imperforate Miliolida, hut 

 liis identification of it with Siddall's P. hingsleyi is more than questionable. Siddall's figure (Proc. Lit. Phil. 

 Soc. Liverpool, vol. xl., App. pi. i. fig. 1) is of the crudest description, and no diagnosis of the form is supplied. 

 It represents almost certainly P. cenomana d'Orb., but we have not been able to find the types in the Siddall 

 Collection now in our possession. It would appear, therefore, that our generic name Iridia should stand and 

 that Carter's young form (figs. 1, 2) should he known as Iridia varians, that Carter's " amoeboid " forms 

 (figs. 3-5) are identical with /. diapihana, and that Ehumbler's Vanlioefenella yaussi is merely an abnormal 

 condition of our type. We shall deal with the matter finally in a forthcoming paper (JRMS. 1910). 



Subfamily P i l u L i N i N ^. 

 Ehaphidoscene Vaughan Jennings. 



124. Ehaphidoscene COllica Vaughan Jennings. (PI, XLVI. figs. 16, 17.) 



lihauhidoiscene conica Vangliau Jennings, 1895, "On a new Genus of Foraminifera of the 

 Familjr Astrorhizicla3," Journ. Linn. Soc. (London), Zoology, vol. xxv. 

 pp. 320-321, pi. X. 

 Rlmmbler, 1903, ZRF. p. 225, fig. 50. 

 Chapman, 1902, F. p. 117, pi. v. fig. H. 



1 Station. 



At Stn. 3 a single specimen was found adherent to a fragment of Zostera, which Ave 

 figure. It differs in several particulars from the original figure and description of 

 Vaughan Jennings, but we have little doubt that it represents the same or a closely 

 allied organism. 



The test is constructed of sponge-spicules of varying kinds, acerate and triradiate, 

 loosely and irregularly felted together, the interstices being filled with fine muddy cement 

 substance. There is no " finish " to the external surface of the test, the spicules in some 

 places projecting slightly from the superficial layer. The test is conical, but slightly 

 truncate at the apex, which bears no special aperture ; there are several irregular inter- 

 stices in the walls of the cone and, round the base at the point of attachment, many 

 openings into the interior. How far these may be adventitious we are unable to say. 



