CRYPTONEMIACE^E. [ 218 ] CRYSTALLOGRAPHY. 



Subtribe 3. GASTROCARPE^:. Frond 

 yelatinously membranaceous or fleshy, often 

 of lax structure internally. Favellidia im- 

 mersed in the central substance of the frond, 

 very numerous. 



Dumontia. Frond cylindrical, tubular, 

 membranaceous. Tufts of spores attached 

 to the wall of the tube inside. 



Halymenia. Frond compressed or flat, 

 gelatinoso-membranaceous, the membra- 

 nous surfaces separated by a few slender 

 anastomosing filaments. Masses of spores 

 attached to the inner face of the membra- 

 nous wall. 



Ginannia. Frond cylindrical, dicho- 

 tomous, traversed by a fibrous axis; the 

 wall membranaceous. Masses of spores 

 attached to the inner face of the membra- 

 nous wall. 



Kallymenia. Frond expanded, leaf-like, 

 fleshy-membranous, solid, of dense struc- 

 ture. Favellidia like pimples, half im- 

 mersed in the frond, and scattered over its 

 surface. 



Iridcea. Frond expanded, leaf-like, thick, 

 fleshy-leathery, solid, of dense structure. 

 Favellidia wholly immersed, densely 

 crowded. 



Catenella. Frond filiform, branched, 

 constricted at intervals into oblong arti- 

 culations; the tube filled with lax fila- 

 ments. 



Subtribe 4. GLOIOCLADEEJE. Frond 

 loosely gelatinous ; the filaments lying apart 

 from one another, surrounded by a copious 

 gelatine. Favellidia immersed among the 

 filaments of the periphery. 



Cruoria. Frond crustaceous, skin-like. 



Naccaria. Frond filiform, solid, cellular ; 

 the ramuli only composed of radiating free 

 filaments. 



Oloiosiphonia. Fi'ond tubular, hollow; 

 walls of the tube composed of radiating 

 filaments. 



Nemaleon. Fronds filiform, solid, elastic, 

 filamentous ; the axis composed of closely- 

 packed filaments ; the periphery of monili- 

 f orm free filaments. 



Dudresnaia. Frond filiform, solid, gela- 

 tinous, filamentous ; the axis composed of 

 a network of anastomosing filaments ; the 

 periphery of moniliform free filaments. 



Crouania. Frond filiform, consisting of a 

 jointed filament, whorled at the joints, with 

 minute, multifid, gelatinous ramuli. 



BIBL. Harvey, Marine Algce ; Derbe's et 

 Solier, Ann. Sc. Nat. 3 s<r. xiv. 273. See 

 also the Genera. 



CRYPTOSTPHUM, Buckt. Agenusof 

 Aphidae. 



Char. Cornicles none or mere pores; 



cauda small ; antennae with 7th joint short. 



C. Artemisice. Brown or blackish, very 



mealy ; eyes reddish. On Artemisia vulgaris, 



deforming and colouring the leaves. 



BIBL. Buckton, Aphides, ii. 145. 



CRYPTOSPO'RIUM, Kze. A genus of 

 Sphaeronemei (Stylosporous Fungi). Mi- 

 croscopic Fungi growing upon bark and 

 leaves, producing spindle-shaped spores, at 

 first conglutinated beneath the epidermis of 

 the nurse-plant. Two species have been 

 recorded as British. 



C. Caricis, Corda. Heaps of spores 

 punctiforin; spores slightly curved, dark 

 brown and pellucid. On leaves of various 

 sedges. Corda, apud Sturm, Deutschl. Flor . 

 t. 1. 



C. vulgare, Fries. Heaps confluent; 

 spores curved, black (subhy aline). On dead 

 twigs of birch, hazel, alder, &c. Corda, /. c. 

 t. li. 



BIBL. Berkeley and Broome, Ann. N. H. 

 2 ser. v. 371 ; Fries, Syst. Myc. iii. 481. 



CRYPTOSTE'GIA, Reuss. A group of 

 hyaline Foraminifera, having an Agathiste- 

 gian or Milioline mode of growth, compri- 

 sing Chilostomella and Allomorphina, Reuss, 

 and probably Ellipsoidina, Brady. These 

 are near allies of Spharoidina, and there- 

 by related to Pulknia and Globigerina. 

 Chilostomella has successive chambers, 

 almost entirely overlapping one another, as 

 in Biloculina, but with a hyaline, and not 

 a porcellaneous shell. Allomorphina is 

 triloculine. 



Recognized in Cretaceous and Tertiary 

 strata, and in existing oceans. 



BIBL. Reuss, Sitzungs. Akad. Wien, 

 1861, xliv. 372 ; Brady, Qu. Mic. Jn. xix. 

 66. 



CRYSTALLINE LENS. See EYE. 



CRYSTALLOGRAPHY. The laws of 

 crystallography teach us that in perfectly 

 formed crystals, each peculiar chemical com- 

 bination corresponds to a distinct relation 

 of all the angles which can possibly arise 

 from the primary form ; hence by ascer- 

 taining the latter, we can usually infer the 

 former. It was our intention to have given 

 a sketch of the method of determining the 

 primary forms of the more common micro- 

 scopic crystals, and the systems to which 

 they belong ; but our space is far too limited 

 for this purpose, and the subject is so diffi- 

 cult, that we must rest satisfied with a re- 



