MAKN — DIATOMS OF THE ALBATROSS VOYAGES, 387 



altio includes C. radiatus T.uucl.-Fort.,<^ a diatom that does not in tlie lea^t resemble 

 this ppecies. 



Fomul at station 2923, off southern California. 



Campylodiscus ecclesianus Civev. Quart. Journ, Micr. Sci. 5: 10. pi, S. f. 5, 1857, 



Pritch. Hist- Infug. ed. 4. SOL 1861. Schmidt, Atlas pi 16. f, 8-11, pi 17,/. 16. 



1S75; pi 208, f. 3, 1897; also pi 16./, 3, 5 (unnamed). 1875. :^loeh. Diat.-taf. pi 



IL/. .7. 1S!)0. Pant, Beitr. Bacill. Ung. 1: 40. pi 3./. 26. 188G; 2: 7L 1889. 



De Toni, Syll. Alg. 2: G23. 1894, 

 CampylodiscH,H /incslratus Grev. QuarL Journ. Micr. Sci. 5: 9. pi S,/. 4- 1857. ? 



Moeb. Diat.-taf, pL IL/. 4. 1890. Grun. Yerh. Zool. Pot. (ies. Wien 12: 133, 



18C2. Pritclu liist. Infus, ed. 4. 801. 1861. 

 Campylodiscus rabcnhorstii Jan. in Rabh. Beitr. 1: 6. pi 1./. 6-7. 1863. Schmidt, 



Atlas pi 53./. 12-14. 1877. Grun. A^erh. Zool. Pot. Ges. Wien 12: 435, 1862. 

 Cainpylodlscas weiss/logi Dcby; Fricke. Verzeicli. 23. 1902. 

 Campylodiscus tacnoldcs Deby; Fricke. Verzcich. 23. 1902. 



Altliougli specimen of this species do i^lunx something like the *'four-i=!quare whi- 

 dows" mentioned by Greville in his description of C. /cmstratKs,^^ it is diflicult to 

 believe thot Greville was misled by an illusion of two superposed valves and gave a 

 name to that illusinii when he had both forms before him; especially as he describes 

 the border of C. /nicstratus so differently from that of C ecclesianus. an<l that, too, 

 in a way that could not result from two superjxised valves, l^ir in C, /enestratus it 

 is of narrow continuous <'o^tae, while C. ecclesiarius has a strong double row. How- 

 ever ingenious this deduction of Greville's mistake is, I am not at all certain it is 

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

 synonymous the flrst-meniioned name, C. /emslratus, should be 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, c 



Found at station 45LGII, Gulf of California. 



Campylodiscus galapagensis, Mann, sp. nov. PbATK LI, figure 3. 



Fruslulc comparatively flat, the double bend of tlie 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 being of the 

 game width as, an<l continuous with, the costae; each conii)artnient ornamented with a 

 stout proi-ess jjrojecting inward from the caiter margin or edge; within the rim or border 

 two rows of costae; outer row consisting of smooth, larire costae, three times as long 

 as broad, iheir outer ends l>eing slightly notched, their inner ends rounded; costae 

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

 the same length, partly <'left, however, or in some cases wholly divided longitudinally 

 by a thin median line, so that they appear to J)e double the iiumber and half the 

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

 shadowy indistinct radiating lines, and, second, by a single row on each side of large 

 oval beads, irregularly placed, })ut generally parallel to tlu^ margin. 



Diameter of valve, O.M> mm,; width of costae at margin, 28 in 0.1 mm. 



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

 Islands, April 4, 1888; 812 fathoms, bottom of Globigerina ooze and coral mud. 

 ' There is enough similarity between this and C, peramplus Cleve,^ to note here 

 the possibility of the two being the same; especially as Clove's fo^m was also found 



«Mem. Soc. Emul. St. Brieuc 48. pi .5./. 57. 1879. * 

 b Cf. also Schmidt, Atlas pi 16./ 8. 1875. 



cOp. cit. pi 17./. 16. 



dSv. Vet. Akad. Handl. 18': iJ, pi 4-/ 53, 188L 



