REPORT ON THE TETRACTINELLIDA. 
Ill 
Calthropella geodiides (Carter). 
Pachastrella geodioides, Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xviii. p. 407, pi. xiv. 
fig. 23, 1876. 
Sponge. — More or less spherical, wider at the base than at the summit ; surface even, 
shghtly roughened by projecting spicules ; oscules small, scattered singly. 
Spicules. — I. Megascleres. 1. Oxea, 0736 by 0'0093 mm. 2. Calthrops, three 
actines of equal length, 07 by 0‘085 mm., the fourth reduced to a rounded tubercle, or 
suppressed, being represented merely by a short axial fibre within a triactinate form. 3. 
Dichoccdthrops, variable, one actine simple, suppressed or not, the other three bifurcated 
or not. Smaller than the simple calthrops. 
II. Microsclere. 4. SpTieraster, centrum large, actines reduced to rounded tubercles ; 
0’0254 mm. in diameter. > 
Colour. — Dark grey. Size, 25 mm. high, by 25 mm. in diameter at the base. 
Habitat. — Near Cape St. Vincent. 
Caltliropella {?) exostitus (0. Schmidt). 
Pachastrella exostitus, 0. Schmidt, Spong. Algiers, p. 16, pi. iii. fig. 12, 1868. 
Spicides. — I. Megasclere. 1. Calthrops. 
II. Microscleres. 2. Tubercidate microrahds and splierasters. 
Habitat. — Eed Sea. 
Remarks. — The spheraster with actines reduced to tubercles appears to resemble that 
of Calthropella geodiides and Calthropella simplex, and I therefore with some hesitation 
assign this species to the genus Calthropella.. The tuberculated microrabd suggests 
affinities to Dercitus. 
Genus (■?). 
Pachastrella connectens, 0. Schmidt, Spong. Atlant. Gebiet., p, 65, pi. vi. fig. 5. 
Sponge. — “ A smutty brown knob.” 
I Spicules. — I. Megascleres. 1. Oxea, 2'13 mm. long. 2. Calthrops, actines 071 by 
^ 0’305 mm. 
! II. Microscleres.' 3. Microxea, O'l mm. in length. 4. Microstrongyle, often 
; centrotylote, O'l 9 mm. long. 5. Aster, 0'035 mm. in diameter. 
: Habitat. — Florida, 7-^ fathoms. 
, Remarks. — I have pieced together the information afibrded by Schmidt’s description 
I and a type-slide in the British Museum, but with no satisfactory result. 
