fO 



SYSTEilATIC HISTORY OF THE INFTJSOJllA. 



terranean seas. 1-696" to 1-480". Dor- 

 sum convex. The striae in Kiitzing's 

 figm-es are concentric witli the extremi- 

 ties ; and this species seems to differ from 

 C. Scutellum in its more distinct border. 



C. distans (Greg.). — Elliptic, with 

 somewhat attenuated ends, a delicate 

 median line and transverse series of 

 equal, rather distant granules. GL)C. 

 p. 18, pi. 1. f. 23. (vii. 38.) Scotland. 

 This species agrees vv'ith C. Scutellum in 

 its granulated striae, somewhat concen- 

 tric with extremities, hut it appears to 

 us distinct. The striae are fewer, the 

 granules far more conspicuous, and, ac- 

 cording to Professor Gregory, equal, and 

 situated on white, hyaline, faint bars, — 

 characters absent in C. Scutellum. 



C. lamprosticta (Greg.). — Large, rhom- 

 boid or broadly lanceolate with obtuse 

 apices, a median line, and transverse 

 series of rather distant conspicuous 

 granules. Greg TMS. v. pi. 1. f. 28. 

 Scotland. This species agrees with C. 

 distans in having conspicuous transverse 

 series of granules somewhat concentric 

 wdth extremities, but differs in its elon- 

 gated form. 



C. splendida (Greg.). — Large, elliptic, 

 with conspicuous, moniliform trans- 

 verse striae, a broad margin, and a me- 

 dian line dilated at centre and ends. 

 GDC. p. 21, pi. 1. f. 29. Scotland. Stride 

 somewhat concentric with extremities, 

 their granules near the margin being 

 closer, and thus forming a continuous 

 rim, with the median line terminating 

 at its inner edge. Eemarkable for its 

 large size. Length about -0044" ; breadth 

 •0039". 



C. Regina (Johnston). — Valve ovate ; 

 striae 20 in -001", concentric around the 

 extremities, distinctly granular on either 

 side the median line, in their course out- 

 wards faintly moniliform, more conspi- 

 cuously so and forming a sort of border 

 near the margin. Johnston, JjMS. viii. 

 p. 13, pi. 17. f. 1. Elide guano. 



C. 2^^(fictatiss{ma (Grev.). — Elliptic, 

 densely areolato-punctate ; striae monili- 

 form, concentric with extremities ; me- 

 dian line dilated at ends; rim simply 

 striated. Grev MJ. v. p. 8, pi. 3. f. 1. 

 Marine. Trinidad. Striie 20 in -001". 

 Dr. Greville says it differs from C. Mor- 

 risii in its finer, closer, and more mi- 

 nutely punctated strite. 



C. crehrestriata (Grev.). — Elliptic- 

 oljlong, delicately, closel}-, and uniformly 

 pimctato-striate ; stria? concentric with 

 extremities ; median line straight, simple. 

 Grev M J. v. p. 9, pi. 3. f. 2. Trinidad. 



Length -0022" to -0028"; breadth -0012" 

 to -0014" ; stri^ 30 in -001". The figure 

 shows the ends of the valve more atte- 

 nuated than usual in this genus. 



C. Gret'illii {S.). — Elliptic, with trans- 

 verse costae ; striae monilifonn, 15 in 

 •001". ^ SBD. i. p. 22, pi. 3. f. 35. Eng- 

 land, South Africa. 



C. regalis (Grev.). — Valve orbicular j 

 striae moniliform, 5 in -001", occupying 

 about a third of the diameter, externally 

 continued by large distant granules, 

 forming three or fom* concentric rows. 

 Grev JMS. vii. p. 179, pi. 7. f. 1. Cali- 

 fornian and Algoa Bay guanos. Striae 

 coarse, outer granules large and promi- 

 nent, continued round the whole valve, 

 but smaller near the extremities. Median 

 line abbreviated. 



Cinnnata (Greg.). — Valve oval ; striae 

 concentric with the extremities, large, 

 moniliform, not reaching the median 

 line, but leaving a narrow elliptical blank 

 space ; median line distinct. Grev JMS. 

 vii. p. 79, pi. 6, f. 1. Lamlash Bay. 



C. Par mulct (B.). — Broadly elliptic, 

 with a median longitudinal line, having 

 on each side 10 to 12 large, irregular 

 transverse costae (or sulci) ; surface with 

 transverse granulated striae. Bail. Proc. 

 Phil. Acad. 1853. Tahiti. 



C. sulcata (B.). — Broadly elliptic or 

 suborbicular, with 30 to 40 transverse 

 arcuate sulci. Bail. I. c. Puget's Sound. 



C. inconspicua (Grev.). — Suborbicular, 

 with a broad, rather strongly striated 

 border ; disc diaphanous, strite iaiut, con- 

 centric with extremities, becoming ob- 

 scure in the centre. Grev MJ. \. p. 9, 

 pi. 3. f. 3. Trinidad. Diam. •OOU" ; 

 striae 22 in -001". Dr. Greville's figure 

 shows the strias radiating rather than 

 concentric with the extremities, and 

 leaving a blank median space bisected 

 by the median line and nodule. 



C. ornata (Greg.). — Elliptic, with a 

 strongly striated rim ; disc with a lan- 

 ceolate median blank space, bisected by 

 a faint median line and large nodule; 

 striae somewhat radiant. GDC. p. 19, 

 pi. 1. f. 24. Scotland. 



C. Finnica (E.). — Ovate - oblong, 

 slightly convex, smooth externally, but 

 striated within. /3 larger, elliptic, three 

 or four times longer than broad. EM. 

 many figui*es. Ehrenberg gives about 

 thii'ty habitats in Australia, Asia, Ame- 

 rica, and Europe, (xii. 41.) 1-570" to 

 1-360". Ehrenberg's figm-es do not agree 

 with his description. They are elliptic 

 with finely-dotted transverse striir, and 

 a ])lank, generally lanceolate longitu- 



