OF THE COCCONEIDE-S. 



869 



and conspicuous strise from C. diaphana, 

 the only allied species. 



2 * Disc with radiant or transverse 

 strice. 



C. striata (E.). — Elliptic-oblong, of 

 medium size, witli parallel or somewhat 

 converging transverse striae. EM. many 

 figures. Aquatic. Apparently common, 

 as Ehrenberg gives upwards of forty 

 habitats in different parts of the world. 

 Lough Mom-ne deposit. 



C. horealis (E,). — Elongated-elliptic 

 or oblong with rounded ends and parallel 

 or converging transverse striae. EM. 

 several figures. Ehrenberg gives about 

 thirty habitats in Asia, Africa, &c. Ex- 

 cept in its more elongated frustule, it 

 scarcely differs from C. striata. 



C. transversalis (Greg.). — Small, nar- 

 now-elliptic, with fine, parallel, dotted 

 transverse striae reaching the median 

 line. Greg MJ. iii. pi. 4. f. 7. (vii. 37.) 

 Scotland. 



C. atmospherica, EM. pi. 39. 3. f. 9. 

 Scirocco dust. Ehrenberg's figure is 

 large, elliptic, with median line and 

 nodule and dotted parallel transverse 

 striae. 



C. hijperhorea (E.). — Large, elliptic, 

 finely punctato-striate ; striae in the 

 middle margin of the disc, 18 in 1-1200", 

 continued to the median furrow as 

 puncta; the fine triple line of furrow 

 with a single, distinct, transversely ob- 

 long median umbilicus. ERBA. x^iii. 

 p. 526 ; EM. pi. 35 a. 23. f. 4. Assistance 

 Bay. Nearly resembles C. Scutum of 

 New HoUand. Breadth rather more 

 than half the length. 



C. nigricans (K.). — Narrow-elliptic, 

 densely aggregated, girt by an entire, 

 rather broad, brownish-black border; 

 transverse striae, 13 or 14 in 1-1200". 

 KB. p. 72, pi. 5. 8. f. 8. Trieste. /3. de- 

 nudata, border obsolete. KB. t. 5. 8. 

 f. 10. 1-1320" to 1-1200". 



C. consociata (K.). — Broadly elliptic, 

 with a hyaline, longitudinal median 

 line ; disc with 13 punctated, almost 

 radiant striae on each side. KB. pi. 5. 8. 

 f.6. Maiine. Baltic. 1-1320". 



C. Pinnularia (K.). — Roundish-ellip- 

 tic, transversely striated, except a smooth, 

 crenated, longitudinal median fascia. 

 KSA. p. 62; KB. p. 73, pi. 5. f. 34. 



= Cocconeis ?, BAJ. xlii. t. 2. f. 34. 



America. This very doubtfid species was 

 constituted by Kiitzing from Professor 

 Bailey's figure. 



C. Persica (Rab.). — Large, elliptic, 

 with a longitudinal median line, dilated 



I at centre and ends, and having 23 gra- 

 nulated transverse striae on each side. 

 Rab D. p. 27, pi. 3. f. 5. Persia. 



C. major (Greg.). — Very large, thin, 

 flat, broadly elliptic or suborbicidar, 

 with numerous delicate transverse striae ; 

 median line with central and terminal 

 nodules. GDC. p. 21, pi. 1. f. 28. Scot- 

 land. Hyaline, without distinct border ; 

 striae about 54 in -001", somewhat con- 

 centric with extremities. 



C. Scutellum (E.). — Elliptic, with 

 finely punctated ti-ansverse striae con- 

 centric with its exti'emities ; stiiae 18 in 

 •001". EI. p. 194, pi. 14. f. 8; SBD. i. 

 p. 22, pi. 3. f. 34. Marine. According to 

 Ehrenberg, foimd in every quarter of the 

 globe ; yet he gives fewer habitats for 

 this than for some other species, (ix. 162, 

 163.) j3, nodule dilated into a stauros : 

 S. /. c. pi. 30. f. 34. y, disc with stauros, 

 veiy fine striae, and two lateral semioval 

 markings : Ro M J. vi. pi. 3. f. 9. Dorsum 

 convex. 1-1150". The species thus cha- 

 racterized is veiy variable in size and 

 form and in the size of its puncta. Per- 

 haps the varieties should be constituted 

 distinct species. 



C. Arraniensis (Grev.). — Valve ovate ; 

 striae concentric wdth the extremities, 

 faint, monilifoi-m, contiguous, reaching 

 the median line ; striae 30 in -001". Grev 

 JMS. vii. p. 80, pi. 6. f. 2. 



C. speciosa (Greg.). — Small, rhomboid- 

 elliptic, with 12 distinctly gTanulated 

 transverse striae in -001", and somewhat 

 concentric with extremities. Greg MJ. 

 iii. pi. 4. f. 8. Scotland. So nearly allied 

 to Cf. Scutellum, that, although its more 

 distant striae are formed of fewer and 

 larger gi-anules, we must doubt whether 

 these species be really distinct. 



C. Mediferranea (K.). — Elliptic or 

 elliptic-oblong, with distinct puncta, 

 regidarly arranged so as to form both 

 transverse and longitudinal series. KB. 

 p. 73, pi. 5. 6. f. 8. Mediten-anean Sea. 

 Rather large; dorsum slightly convex. 

 1-840" to 1-552". In Kiitzing's figures 

 the striae appear somewhat concentric 

 with extremities ; and we doubt whether 

 it be distinct from C. Scutellum. 



C. Peruviaiia (K.). — Elliptic, regularly 

 punctate, the larger puncta quadrate, 

 more distant. KB. p. 73, pi. 5. 6. f. 7. 

 Marine. Western shores of America. 

 1-840". Kiitzing's figure seems very 

 similar to C. 3Iediterranea. 



C. Adriatica (K.). — Large, elliptic ; 

 striae granulated, transverse on the disc, 

 radiatmg on the margin. KB. p. 73, 

 pi. 5. 6. f. 2 & 9. Adriatic and Medi- 



