PLATE IX. 



riG. 



1. — Petalospiris foveolata — var. Elir., Mikrogeologie, Taf. 



XXXVI, 14. .0075 high, spines included, .0031 did. 



of ball. 

 2. — The same without the central spike through it. 

 3. — A Podocyrtis (?) of Ehreuberg. 

 4. — A Podocyrtis (?) nearly akin to podocyrtis jEgles. Mik. 



Taf. XXXV. B. 18.; measures .0106 high, .0052 broad. 

 5. — A Podocyrtis (?) without the usual surmounting spine. 

 6. — A Litliomelissa (?) These beautiful little shapes, like 



crystal tea-pots, or coffee-pots, for some primeval 



world's Queen Mah, are frequent in the Barbado.s 



deposit. 



PLATE X. 



1. — Triiusparent cross, with tubular canals running through 

 the arms and united by a central ring, — a structure 

 resembling an object figured in Professor J. W. Bailey's 

 " Microscopic forms in the Sea of Kamschatka," under 

 the name " Spongolitbes orthogona," but which he 

 says he has referred with some hesitation to Spongo- 

 litliis. Measures .01125 high, .008 broad, with a 

 slightly warted or rugose surface. 



2.— An Eucy rtidiun form bearing tubular spinous projections, 

 arranged in the pattern of the perforations in Eucyr- 

 ti'Jiuiii elegans ; appears to be enclosed in a transparent 

 egg-shaped sheath or envelope, .00362 long — Litho- 

 botrys adspersa, Ehr. Mik. Taf. XXXVI, fig. 5, has 

 the appearance of a wing or fin extending round the 

 object in a somewhat similar way, and so has Carpo- 

 canium Solitarium, Taf. XXII, fig. 28. This specimen 

 is in Slide No Gi? Springfield, Barbados. 



3. — Eucyrtidium (?) elegans, in an unconstrioted state, .604 

 long, .0012 broad ; 23 rows of nearly equi-distant 

 perforations ; from Chimborazo, Barbados. 



4. — A Podocyrtis (?) Mitra or Papalis, var, (?) the lower part 

 devoid of perforations, and with a thickening of the 

 Silex round the boundary of the plain part, — two 

 spines from the apex. 



5. — Podocyrtis Papalis, Ehr. Mik. XXXVI, 23, .00687 high, 

 .00375 broad. In numerous specimens the outline of 

 the base varies considerably, but there always appears 

 to be an internal ring or ledge. 



PLATE XI. 



1. — A magnificent Polycystin, from Cambridge, Barbados. 

 It measures .0214 in height, viz., the ball .0028, and 

 .0186 from the ball to the base, where several more 

 squares appear to have been broken off, — about 18 to 

 20 rows of squares, like windows ; inside soine of 

 them a very fine internal network is seen ; through 

 others appear a fiiint reflection of the bars on the 

 opposite side of the object : the effect of this, viewed 

 in the Binocular (half-inch objective) , is very striking. 



2. — Eucyrtidium Tubulous, Ehr., measures .01 feet long, 

 .0028 broad, from Peak of Tcneriffe, Barbados. Quar- 

 ter-inch objective. 



3. — Stylosphsera (?) Ehr., measures .01 high, curiously 

 beset with sharp, spear-like spines, and covered 

 apparently with pointed knobs or warts. Some of the 

 Barbados Polyeystins suggest an idea as if their 

 perforations either may have been, or might have 

 become occupied by these sort of projections, which, 

 when broken off, leave holes, and being hollow, would 

 still permit the protrusion of the so-called Pseudopo- 

 dian threads, which Professor J. Miiller says " one may 

 conjecture (Termuthcn) " to be the means by which 

 the Polyeystins imbibe nourisliment, although their 

 connexion with the Sareode substance of the bodies, 

 requires more clear elucidation. In the Thallassicollen 

 and Polycystena, they can only be traced as far as the 

 skin-like Capsule of the flabby part lying under the 

 flint corselet. 



4. — Dictyospiris (?) probably the same object as fig. 2, on 

 plate II ; turned on the reverse side. Ehrenberg calls 

 this " Ruckseite," and the other with the larger 

 openings, " Mouthside ; " from Cambridge, Barbados. 



5.— Spongolithis Acicularis, Mik. Taf., XXXVI, fig. 47, a 

 Phvtolitharien of Ehrenberg. 



6.— Amphidiscus Verticillatus, Mik. Taf., XXXVI, fig. 45, 

 classed by Ehrenberg as " Phytolitharia," — of plant 

 growth. 



PLATE XII. 



1. — A spinous variety of Eucyrtidium Ampullus, (?) the 

 narrow end prolonged into a tuliulous siiine, — diam. 

 of bulb, .00275. Chimborazo, Barbados. 



2.— Podocyrtis(?) wliole height, .0112; breadth, 0055; height 

 of cupola, .0027. Professor J. Midler says, " in all 

 the flask and bell-shaped Polyeystins, the first joint 

 (glied) of the reticulation begins from the top, and 

 the number of the increasing links progresses with 

 growth in a definite ratio." The links of the lower 

 part in this fossil skeleton seem running into each 

 other irregularly, like dropped stitches in a stocking, 

 or bursting bubbles in a gelatinous film while solid- 



3. — A further variation of Podocyrtis Schomburgkii, as 

 shewn on plate I, fig. 3. 



4.— A modification of fig. 2, on plate I. 



4 & 6. — Tlie reticulations progressing further towards the 

 " Ladder" or Lattice-shape. In fig. 6, the inner net 

 is very plainly seen, its reticulations are also square, 

 with quarter-inch objective magnifying power used, 

 about 470 linear. Springfield, Barbados. In another 

 slide is a broken-oft' top of one of these Ladder- 

 Pyramids, with the narrow neck sv^elling out into 

 the surmounting ball nucleus (?) 



WlNDEEMiRE : fBINIED BY JOHK GABNETT. 



