MANN- DIATOMS OF THE ALBATROSS VOYAGES. .)>< 



also includes C. radiatus Leud.-Fort.,° a diatom thai does ool in the leasl resemble 

 this species. 



Found ui Btation 2923, off southern I alifomia. 



Campylodiscus ecclesianus <■ re \ . Quart. Journ. Micr. Sci. 5: LO. pi. 8. 



Pritch. Bist. [nfus. ed I. 801. L861. Schmidt, Atlas pi. 16./. 8 n, pi. 17./. 16. 

 L875; pi. 208. f. 8. L897; also pi. 1 6.f. 8, 5 (unnamed . L875. Moeb. Diat.-taf. pi. 

 n. J. 5. L890. Pain. Beitr. Bacill. Ung. 1: 10. pi. 8. f. 26. L886; 2: 71. : 

 De Toni, Syll. Alg. 2: 623. L894. 



Campylodiscus fenestratus Grev. Quart. Journ. Micr. Sci. 5: '.». />/. •;./.,. K">7. ? 

 Moeb. Diat.-taf. pi. 11. f. ;. L890. Grun. Verh. Zool. Bot. Ges. Wien 12: 133. 

 L862. Pritch. Bist. [nfus. ed. I. 801. L861. 



Campylodiscus rabenhorstii Jan. in Rabh. Beitr. 1: ii. pi. l.f. >; 7. 1863. Schmidt, 

 Atlas pi. 58. f. 12 14. L877. Grun. Verh. Zool. Bot. Ges. Wien 12:435. :■ 



Campylodiscus weissflogi Deby; Fricke, Verzeich. 23. L902. 



Campylodiscus taenoides Deby; Fricke, Verzeich. 23. L902. 



Although specimen of this species <1" show something like the "four-square win- 

 dows" mentioned by Greville in his description of C. fenestratus, & i1 is difficult to 

 believe that Greville was misled by mi illusion of two superposed valves and . 

 name to thai illusion when he had both forms before him; especially as he describes 

 the border of C. fenestratus so differently from that of C. ecclesianus, and that, too, 

 in a way thai could not result from two superposed valves. For in C. fenestratus it 

 is of narrow continuous costae, while C. ecclesianus lias a strong double row. Bow- 

 ever ingenious tin- deduction of Greville's mistake i<. I am not at allcertainil i> 

 correct. I have therefore, left the name as above whereas if the two be actually 

 synonymous the first-mentioned name. C. fenestratus, should he used. 



The form found by me has the lines of the central area so very faint that they are 

 practically invisible; a variation somewhat like that shown in another figure by 

 Schmidt. '' 



Found at station 4516H, Gulf of < lalifornia. 

 Campylodiscus galapagensis, Mann, sp. nov. Plate 1.1. figi re .">. 



Frustule comparatively Hat. the double bend of the valves, characteristic of the 

 genus, being considerably below the average; rim divided into compartments by 

 very thin cross septa formed by continuations of the sides of the costae, the costae 

 making a double ring within the rim ; the compartments of the rim thus beingofthe 

 same width as, and continuous with, the costae; each compartmenl ornamented with a 

 stoui process projecting inward from the outer margin or edge; within the rim or border 

 two rows of costae; outer row consisting of smooth, large costae, three time- as long 

 as broad, their outer ends being slightly notched, their inner end- rounded; costae 

 of the second row continuous i not alternate with those of the outer row and of about 

 the same length, partly cleft, however, or in Borne cases wholly divided longitudinally 

 by a thin median line, so that they appear to he double the number and half the 

 width of the costae of the outer row; central area large and marked, first, by a few 

 shadowy indistind radiating line-, and. second, by a Bingle row on each side of large 

 oval head-, irregularly placed, hui generally parallel to the margin. 



Diameter of valve, 0.19 mm. ; width of costae a1 margin, 28 in i>. I mm. 



Type in the U.S. National Museum, No. 590155, from station 2807, Gala] 

 Islands. April !. L888; 812 fathoms, bottom of Globigerina ooze and coral mud. 



There is enough similarity between this ami C. peramplus Cleve, d to note here 

 the possibility of the two being the same; especially a- Cleve's form was also found 



"Mem. Soc. Emul. St. Brieuc 18. pi. 5.f. 57. i s 7'». 

 &Cf. also Schmidt, Atlas pi 16. f 8. 1875. 

 cOp. cit. j>I. 17. f. 16. 

 <*Sv. Vet. Akad. Ilandl. 18 : 17. pi. . ./'. .... 1881. 



