PROTOZOA. 
679 
remaining third there are ten orifices from which tufts appear to have been 
extracted. Length of sponge 4} indies, diameter at middle 22 lines, at lower 
end 16 and 17 lines, at upper end 8 lines ; length of tufts of spicules 2 inches. 
I\ anncp, sp. n., Leidy, 1. c. p. 10, locality Santa Cruz. 
It is possible that this may be the same genus as that described by Wyville 
Thomson as llolienia,, of which it would have the priority, as his memoir on 
Holtenia was only received at the Royal Society on the 16th June, 1869 ; 
and a supplement in the memoir is dated Nov. 19, 1869 j but no allusion 
is made by Wyville Thomson to Leidy’s genus. 
Hyalonema mirahilis. Dr. J. E. Gray, 1. c. p.l95, again calls attention to the 
remarlcable form of the spicules in the stem of this species, the concentric 
coats of which are quite sui generis ; but Claus describes the same concentric 
coats in the spicules of Euplectella, as Dr. Gray acknowledges. Ann. & Mag. 
N. Hist. ser. 4, vol. iii. p. 323. 
Discodermia jwlgdiseuSf Bocage, = Daetglocalg.v polydiscus, Dwk., Bocage, 
1. c. p. 160, pi. 11. fig. 1. Prof. Bocage forms this genus for species of 
Dactyloealyx in which the external layer consists of superimposed disks. 
Coasts of Portugal and West Indies. 
Podospemgia lovenii, g. et sp. nov., Bocage, 1. c. p. 169, pi. 10. fig. 1, coasts of 
Portugal, = borealis, Bocage. Vide Zool. Record, 1868, p. 684. 
Rcniera grayi, sp. n., Bocage, /. c. p. 160, pi. 10. fig. 2, Coasts of Portugal. 
Tethya lyncurimn, Lam. Vaillant, 1. c., records the results of many ex- 
periments made on this species, and comes to the conclusion that either the 
cortical or medullary substance can, when isolated the one from the other, 
produce the one the other, but that the vitality of the former is greater than 
that of the latter substance. The grafting of individuals in this species is 
accomplished with facility; but the attempts to graft on it species of the 
genera Sycon, Halichondria, Re^iiera, and Rolymastia failed. This species is 
also described in great detail by Carter, /. c. p. 7, pi. 2. figs. 1-6. 
Tethya dactyloidea, sp. n.) Carter, 1. c. p. 15. Sea, south-east coast of 
Arabia, in shallow sandy bottom, near shore. This is a siliceous sponge 
growing erect on the sand. The woodcut shows it of natural size, with a 
body-pedicel and root or filamentous extension into the sand; the upper 
extremity has a septated vent, a vertical section of which shows a cloacal 
cavity and termination of excretory canals. 
Tethya arahica, sp. n., Carter, 7 c. p. 3, pi. 1. fig. 1-8, pi. 2. figs. 19, 20, 
south-east coast of Arabia, opposite the north-east end of the Island of 
Masira. Gemmiile-like bodies are figured and described as occurring in this 
species, l.c. p. 20. 
Geodia {Cydonium, Gray) arahica, sp. n.. Carter, 1. c. p. 4, pi. 1. figs. 9-16, 
south-east coast of Arabia, opposite the north-east end of the Island of 
Masira. Nearly allied to G. zetlandica. 
Pachymatisma johnstonia, Bwk., is described minutely and figured by 
Carter, 1. c. p. 8, pi. 2. figs. 7-18, 
Placospongia melohesioides. Gray. The Recorder mentions having found 
this species living at Mah^, and quotes, with doubt, as a synonym, the Aca- 
mas violacea of Duchassaing and Michelotti. Quart. Journ. Mic. Science, 
1869, p. 322. 
Carter, 1. c. p. 18, objects to the term ovaria being applied to the siliceous 
radiate bodies met with in the corticate sponges. He calls them globular 
