898 



SYSTEMATIC HISTOHY OI' THE INFUSOEIA. 



concentric with the extremities. The ; 

 blank spaces have a considerable resem- 

 blance to those of N. forcipata, Grev. \ 



N. sjjectabilis (Greg.). — Broadly ellip- | 

 tic, gradually tapering to the obtuse I 

 apices ; blank spaces broadly linear, con- j 

 verging at nodide and ends ; striae 22 in [ 

 •001", coarsely moniliform, the outer 

 series forming a broad marginal band 

 much dilated opposite the nodule. GD. 

 p. 9, pi. 1. f. 10. Marine. Scotland. 

 Large (inner) bands of striae linear. 

 Distinguished from N. Lyra by broader 

 blank spaces and the brown colour of 

 the striated portions ; its nodule also is 

 indefinite. 



N. siihorhicularis (Greg,). — Small, 

 broadly oval or suborbicular ; striae con- 

 spicuous, about 18 in -001", divided by a 

 longitudinal line into two series, outer 

 one broadest opposite the indefinite cen- 

 tral nodule. = N. Smitliii suborhicularis. 

 GD. p. 15, pi. 1. f 17. Marine. Scotland. 



N. Coiqjeri (Bailey). — Largo, oblong, 

 ysAih. slightly constricted sides and con- 

 tracted mammiform apices ; striae punc- 

 tate, divided into series by two narrow 

 longitudinal blank bands united by the 

 transverse nodule. = Pinmdaria Coiiperii, 

 BMO. p. 39, pi. 2. f. 3. United States. 

 The outline is like that of N. paradoxa ; 

 and the markings somewhat resemble 

 those of N. Lyra, /3. Blank spaces con- 

 nivent at their apices. 



N. Ilenncdyi (S.). — Elliptical, with 

 rounded or mammiform ends ; striae mo- 

 niliform, divided into series by two nar- 

 row, lunate longitudinal blank spaces, 

 the marginal series of nearly equal 

 breadth throughout. SBD. ii. p. 93: 

 Greg. MJ. iv. pi. 5. f. 3. = Stauronois cm- 

 qulata, Johnston, MJ. viii. p. 13. Marine. 

 Britain, (vii. 69.) Strire 24 in -001", 

 not perceptibly longer opposite the cen- 

 tral nodide, which is indefinite. 



N. clavata (Greg.). — Broadl}^ elliptical, 

 with apices produced into mammiform 

 points ; striae moniliform, divided into 

 series by two arcuate longitudinal blank 

 spaces bent outwards at their ends ; 

 marginal series of nearlv equal breadth 

 throughout. TM. iv. pi. 6. f. 17. Marine. 

 Scotland. Striae 20 in -001", not per- 

 ceptibly longer opposite the central no- 

 dule, which is indefinite. 



N. nehiilosa (Greg.). — Elliptic-oblong; 

 blank spaces large, semilunate ; striae 

 fine, 34 to 36 in -001", forming a narrow 

 marginal band of equal breadth. GD. 

 p. 8, pi. 1. f 8. Marine. Scotland. Inner 

 bands of striae, veiy narrow linear, close 

 to median line. Aspect of valve hazy 



and indistinct; striated portions bluish 

 under a low power ; nodule indefinite. 



N. pratexta (E.). — Large, elliptic 

 with broadly rounded ends ; striae di- 

 stinctly moniliform, 8 to 10 in -001", 

 forming a marginal border of nearly uni- 

 form breadth, which is separated from 

 the narrow median band by a large 

 sparsely granular space on each side. 

 EB. 1840, p. 20; GD. p. 9, pL 1. f. 11. 

 ^Finmdaria prcetexta, EM. pi. 19. f. 28. 

 Marine, Scotland; fossil, Greece. 1-288". 

 This species is distinguished by its large 

 size, coarse striation, much rounded ends, 

 and a broad semilunate space between 

 the marginal and inner bands of stria?, 

 furnished with scattered granides. 



N. Californica (Grev.). — Broadly 

 elliptic, with flattened sides ; striae mo- 

 niliform, divided into narrow marginal 

 and median bands by a large, semilu- 

 nate, smooth intermediate space on each 

 side the median line. Grev. Edin. New 

 Phil. Jour., U.S., x. pi. 4. f. 5. Calif ornian 

 and S. African guanos. Marginal sti*i£e 

 20 in -001". Dift'ers from N. prmtexta in 

 having the sides of the valve flattened, 

 and the broad intermediate space be- 

 tween the marginal and median striae 

 smooth. 



N. pohisticta (G rev. ) . — Elliptical ; striaa 

 moniliform, forming a narrow marginal 

 band, separated from the median line by 

 an irregularly punctate, lunate inter- 

 mediate space ; striae 25 in '001". Grev. 

 I. c. f. 2. Californian guano. Valve mi- 

 nute. Differs from N. prcptexta in its 

 smaller size and far less rounded ends. 



N. Smitliii (Breb.). — Elliptic, with 

 rounded apices ; striae distinct, 21 in 

 •001", interrupted on each side of the 

 median line by a longitudinal line ; the 

 inner series narrow, fainter. = N. eUiptica, 

 SD. i. p. 48, pi. 17. f. 152. Marine. 

 Europe. The outer series of striae is 

 broad, but not dilated opposite the 

 central nodule. 



N. fusca (Greg.). — Large, elliptic- 

 oblong, with broadly roimded ends; 

 striae coarsely moniliform, about 10 in 

 •001", divided on each side by a longi- 

 tudinal line into two series, the inner 

 one fainter. = iV. Smitliii, ^ fusca, GD. 

 p. 14, pi. 1. f. 15. Marine. Scotland. 

 Differs from iV. SmifJiii in its much larger 

 size and more distant striae. Nodule 

 indefinite ; median smooth space narrow 

 lanceolate. 



N. iiitescens (Greg.). — Small, elliptic- 

 lanceolate, with obtuse apices; striae 

 obscurely moniliform, about 16 in -001", 

 converging at centre, divided on each 



