192 Transactions of the South African Philosophical Society. 



living the test is erect and sessile, growing attached or rooted by its 

 narrow extremity to some fixed base, and that the interstitial 

 orifice of the terminal chamber serves as the general aperture. 



It would appear quite evident from the above that the late Dr, 

 Brady was cognisant of the true character of this interesting 

 rhizopod when in its perfect living condition, although no definite 

 mention is made of the chamber walls ; it must .be borne in mind 

 that he had but incomplete fragmentary specimens to deal with ; the 

 fact that he mentions the many orifices left between the sand-grains, 

 and the interior of the tube (or central chamber)''' in parts being sub- 

 divided, is, I take it, an admittance that he saw the primitive 

 arrangement of chambers in the walls of the test. 



Again, the iate Dr. H. C. Carpenter (loc. cit.) states that the 

 cavity of the tube is not divided into chambers by interposed septa, 

 as in the genus Beophax ; but it is continuous throughout, though 

 traversed in every part of its length by irregular processes, which 

 goes to prove its close affinity to the structure of the chambered 

 walls of Botellina pinnata. 



Neither Dr. Carpenter nor Dr. Brady mentions any special 

 formation of chambers by the sand-grains in the building up of the 

 walls of the test (except the irregular processes traversing the whole 

 length of the tube (?)), from which it would be inferred that they 

 both saw, at least in some of the fragments examined by them, a 

 central continuous tube, or main chamber in direct communication 

 with the interstices, cellular, or chambered wall structure. I have 

 examined some of the actual specimens or fragments from which 

 Messrs. Carpenter and Brady made their descriptions, and these 

 show definite indications of chambers in the walls of the test, with 

 inter-communications with the main chamber, resembling that of 

 B. pinnata, but the fine material which forms the outer coating and 

 gives the smooth and solid finish to the outer surface of the whole 

 test of Botellina pinnata is altogether wanting in B. labyrinthica ; 

 still, I consider there is sufficient generic similarity to retain the 

 new species under the genus Botellina founded by the late Dr. H. P. 

 Carpenter, although on first acquaintance there is a strong desire 

 to form a new genus, which, however, is lost sight of on structural 

 examination of the tests of each species. 



I wish here to thank my friend Mr. J. W. Tutcher, of Bristol, 

 for the energetic manner in which he undertook the difficult task of 

 producing by micro-photography figs. 8-11 on the Plate. 



* The italics are my own. 



