372 MESSES. E. HERON-ALLEN AND A. EAELAND ON THE 



to the direction and manner in which additions to the original chamber have been 

 made. In rare instances the test spreads as a furcating tube attached to the host 

 (fig. 12). The external surface of the organism is generally very irregular in outline, 

 owing to the haphazard mode of growth, and the internal cavity may for the same 

 reason become quite irregular and contorted. 



The examination of the Kerimba dredgings has enabled us to clear up the un- 

 certainty which obscured the proper affinities of the two very distinctive and curious 

 Ehizopods figured and described in our Bognor and Selsey papers (with reservations) 

 under the names Thuravimina papillata Brady, and Webhina hemisphoenca Jones, 

 Parker, and Brady, and has revealed a fact which was not suspected by us at the time, 

 namely, that they were but stages in the life-history of the same organism. We have 

 now found numerous perfect and highly developed individuals, in all stages of growth, 

 and with the protoplasmic body perfectly preserved. 



Specimens are generally distributed in the Kerimba material, most abundantly at 

 Station IX., but the finest individuals were obtained at Station X. and IX. (which are 

 practically identical), part of the material bearing these numbers having been preserved, 

 in the fresh condition, in spirit. The sample from Station X. was a dredging from a 

 bottom of saud and mud, made in depths varying from five to twenty-two fathoms in 

 Montepes Bay ; and as we have observed {ante) the sample % X. is from about the same 

 locality. At Station X. the material yielded a full series of specimens, from the 

 primordial, minute, and dome-shaped test figured and described by us from Selsey Bill, 

 under the name WebMna hemisphoenca C?) J., P., & B., to fully grown individuals of 

 relatively gigantic size. 



Except in the fact that the Kerimba specimens reach a larger size than that attained 

 by the British individuals, there is very little to add, as regards the diagnostic 

 description of the adult form, to that supplied by Earland ut supra. The species was 

 there described as follows : — " No two specimens are alike, some being comparatively 

 smooth, and more or less regular in shape, while others are of the roughest construction 

 and more or less lobate in outline. The specimens are both free and attached, and 

 the free-growing tests are usually of much neater and more regular construction than 

 the attached specimens. In colour they are of a light grey, and are composed of sand- 

 grains and a grey cement. The size of the sand-grains is very variable, even in a single 

 specimen, and frequently one or more sand-grains of relatively enormous size (^ to 

 \ of the w'hole bulk of the test) are built into the test, from the surface of which 

 they project, giving a very rough and unfinished appearance to the shell. The 

 sand-grains are attached to a delicate chitinous membrane, that lines the cavity, and 

 which, in detached specimens, is observable as a diaphanous film enclosing the 

 body-cavity. The " irregularly disposed perforate papiliee," which, according to Brady, 



