802 



SYSTEMATIC HISTORY OF THE IXFUSORTA. 



3 * Disc sitbcircnlar, tcith radiating series 



of (/ramdes or perforation-Iihe dots. 

 Corouia (Uhr.). 



C. Echeneis (E.). — Disc bent, with nu- 

 merous iiTeg'ularly radiating series of 

 conspicuous dots, becoming- fewer and 

 more scattered near the centre. KSA. 

 p. 34. = C. Argus, BMO. ph 2. f. 24, 25 ; 

 C. cribrosus, SBD. pi. 7. f. 55. Marine. 

 America, Europe, England. Diam. 1-288". 

 The costse are nearly obsolete, and con- 

 fined to the margin. We refer C. Argns 

 to this species upon the authority of our 

 lamented friend the late Professor Bailey, 



C. dijyiost ictus (Norman). — Disc with 

 conspicuous marginal, moniliform, radi- 

 ating lines, alternate ones shorter, and a 

 large, subelliptic, central blank space. 

 GrevTMS. viii. p. 31, pi. 1. f. 6. Australia. 

 The cellules of the strife are linear-ob- 

 long, and, being marked longitudinally 

 by a faint line, appear doubled. 



C. heUophilus (E.). — Disc small, sub- 

 orbicular, including in the broad and 

 smooth median area a quadrate series of 

 granules, similar series of gi'anules being 

 radiately disposed in the broad margin, 

 and in a double concentric order; the 

 external rays simple, the inner ones 

 binary. KSA. p. 33. Maritime. India, 

 China. The proper aiTangement of this 

 and the next species is doubtful. 



C. Indicus (E.). — Disc large, with a 

 subquadrate, smooth, median area, and a 

 very broad margin formed of fine and 

 dense radiating series of granules in a 

 double concentric order. KSx\, p. 33. 

 Maritime. King's Island, India. 



Var. /3. Concentric rays continuous. 

 Var. y. Concenti'ic rays interrupted. 



4 * Disc suhcircular, with a narrow, me- 

 dian, peiTious, smooth hand, afid tratis- 

 vei'se lateral strice. 



C. ? striates (E.). — Disc with two series 

 of about 13 transverse striae on each side 

 of the median line. EA. iii. pi. 7. f. 13 ; 

 KB. pi. 28. f. 11 ; Bri MJ. vii. p. 79, pi. 9. 

 f. 4. Fossil. Vera Cruz. 



5 ^ Frustules in lateral vieiv not circular. 



C. Surirella (E.). — Disc large, flexuose> 

 oblong; the middle broad and smooth, 

 the margin narrower, with radiating 

 striae. KSA. p. 33. Aquatic. Spain. 



C. ovatus. — Disc eiu'ved, large, ovate, 

 obtuse, with nine very broad pinna in 

 1-276". = Surirella Clypeus, E. Marine. 

 Baltic. 1-276". 



C. Ehrenhergii. — Disc flexuose, small, 

 ovato - elliptic ; ends equally rounded ; 

 margin striated, with from 10 to 12 costae 

 in 1-V200".z=: Surirella Catnpglodiscus, E. 

 Aquatic. Italv, Mexico, (xv. fs. 12, 13, 

 22 & 23.) 



C. spiralis (K., S.). — Spirally twisted, 

 with a dotted margin ; laterally elliptic, 

 with about 60 nearly parallel costae ; cen- 

 tre of disc minutely punctate. SBD. i. 

 p. 29, pi. 7, f. 54. Aquatic. Europe, 

 England, (iv. 39.) C. spiralis difiers from 

 C. Ilihernicus in its elliptic and twisted, 

 not saddle-shaped fi'ustule. We doubt 

 if it be distinct from C.Jlexuosa. 



CJlexuosa (E.). — Disc large, flexuose; 

 costae 4 or 5 in 1-1200" .= Sm-irella Jlex- 

 uosa, E. KB. t. 28. f. 25, Aquatic. 

 Africa, South America, Mexico, France. 

 (XV. f. 11.) 



C. elegans (E.). — Large, very broad, 

 with subacute ends, and very finely- 

 punctate siirisice. = Su)'i)'ella elegatis, E. 

 KB. t. 28. f. 23. Aquatic. Germany, 

 Mexico. Costce 4 in 1-1200". Known 

 only by fragments. 



Q.Myodon (E.). — Small, rather curved, 

 laterally elongated, nan'ow, with one end 

 rounded (the other unknown), with 

 small, closely-set costae, giving the mar- 

 gin a toothed appearance. = Surirella 

 Myodon, E. KB. t. 28. f. 24. Mexico, 

 Japan, Africa. Costae 6 or 7 in 1-1200". 

 Known only from fr-agTiients. 



C. Zonalis (Ph.). — Disc large, gi'eatly 

 deflected ; " radii spnmetrical to two 

 axes ; concentric striation may be de- 

 tected, and some appearance of puncta- 

 tion on the outer edge." Found in cre- 

 taceous, marly deposits. Bridlington, 

 Yorkshire. Prof. J. Phillips, 1845. 



Genus CALODISCUS (Eab.). — Discoid ; disc subcircular, with numerous 

 (often 64) ray-like bands, each connected at the broad, striated rim with its 

 neighbours, and forming tooth-like straps ; centre not striated, clouded, with 

 a lighter transverse one-branched zone. The umbilical zone is probably non- 

 essential, and we doubt whether this genus be distinct from Campylodiscus. 



Calodiscus superbus (Rab.). — Disc a largish clouded umbilical space. Rab. 

 large, flat, with a distinct closely striated D. p. 12. t. 3. Aquatic. Italy, (viii. 56.) 

 rim, and equal radiating costae enclosing 



