"-tv 



MAKN 



DIATOMS OF THE ALBATROSS VOYAGES* 



263 



(»y. Cluill. liot. 2: l\'^.pl30. 



gestioii of puLling (his in a new genus Micropodiscuri; thougli the name wouhl he hud, 

 as sonu^ .specimens have, as al)ove state<l, not a ^'hllle foot," l)u1 a very evident 

 pseudnnn(hile. Castraeane's figun^ gives emi)hasis In (M)iUort<xl markings that do not 

 occur in all cases. I do not agree \vilh Rattray tliat Actinocydus anfarticus Castr.*^ 

 and ^1. innhonalif s Vixsir,^ are synonymous with the above. The failure to find a 

 pseudunodule in the original speeinu'u by O'Meara is probably explained by the 

 inconstancy of that structure. 



Found at station 2859, off the coast of Alaska. 



Actinocydus ralfsii ( \V. Smith; Ralfs in Pritch. Ilisl. Infus. ed. 4. 835. pi. 5./. 84. 18G1. 

 Van Heur. Synop. 215. pi. L^-Lf. 6\ pi. 124./- ^ -I ISSl. O^Meara, Troc. Roy. 

 Irish Acad. II. 2: 208. pJ.SlJ. 1. 1875. Rati. J(»nrn. Qm-k. Mi<T. <Mub 11,4: 155. 

 181)0. DeTonijSyll.Alg. 2: 1170. lSi)4. Caslr.Rep.V 

 f. L 1880. Eng. ,k Pr. Pflanzenlam. 1^'^: 78./ IHU^. 1896. I?lak(s Trans. Wise. 



Acad. 14: 108. /^/.-M. VMl 

 Enpodisciis ralf.ni ^^^ Smith, Syno]>. I'rit. Diat. 2: SO. 1850. Mo(4). Diat.-taf. pL5, 



f.U. 1890. 

 Eupodiscus spars fifi Gre^. Trans. Mii-r. So(\ Lond. n. s. 5: 81. pLl.f.47. 1857. 

 Cosci7iodisci(s /((scus Norm, Trans. Micr. Soc. Lond. ii. s. 9: 7. pL.Lf.'i. 18G1. 

 Actinocydus fiusatii 11, L. Smith, Sp. Dial. Typ. uo. 11. J874. 



The specimens found at stati(jn iiOll are a snudl and coarse variety similar to the 

 figure in Moebius cited aljove. 



Found at stations liliOIll and 3011, off Ihe coast of Alaska. 



Actiiiocyclus sparsus (Greg.) Ratt. Journ. Qu^'k. Micr. Club II. 4: 15G, 170. 1890. 

 De Toni, Syll. Al^^ 2: 1177. 1894. 

 Enpodiscus sparsus Grog. Trans. Micr. Soc. Lond. n. s. 5: 81. pL l.f. 47. 1857. Moeb. 



Diat.-taf- pl.lJ.f.47. 1890. 



Actijiocydus ralfsii s}>arsusIi<x\iSyVv'\\(])-. Hist. Infus. ed. 4. 835. 1801. Cleve&MolL 



type no. 115. 1878. 



Actinocydus fasnculal as C'dsiv. Rep. Voy. (diall. Itot. 2: pl.4f-8-8bis, 1880. 



As Rattray points out/' it is a matter of doubt if this form is not to he looked upon as 

 avariety of -.4. ralfsii, tluis agreeing with Ralfs's opinion'^ inPritch. Hist. Infus. above. 

 But, like Rattray, I feel that this union is questionalile enough to warrant the separa- 

 tion, at least for the present. As has been pointed out in the discussion of the genus, 

 the above differs fntni Coscinodiscus tuherculatus Grev., only in the i:>re8ence of a pseu- 

 doriodule.e 



Found at station 334(1, off the coast of Washington. 



Actinocydus subtilis (Greg.) Ralfs in Pritch. Hist. Infus. ed. 4. 835. 1861. Ratt. 



Journ. Quek. Micr. Club II. 4: 188. 1890. II. L. Smith, Am. Journ. Micr. 2: 



101. 1877. II. L. Smith, Sp. Diat. Typ. 14. 1874. Van Heur. Synop, 216. pL 124, 



/. 7. 1881. De Toni, Syll. Alg. 2: 1183. 1894. 

 FAcpodiscus subUlis Oreg. Trans. Roy. Soc. Edinb. 21: 501. pL 11. f. 50. 1857, inA 



Fihrenb. 1855. nom. nud. 

 Eupodiscus gmjorianus I5rel>. Journ. Quek. Mior. Club 2: 41. 1870. 



«Rep. Voy. Chall. Rot. 2: 145. 1886. 



b L(K.'. cit. pL 4- fiJ- /■ 



c Journ. Quek. Micr. {^ub IL 4: 156. 1890. 



dCi^ Pritch. Hist. Infus. ed. 4. 835. 1861. 



€ See Greville's original figure ini Trans. Micr. S(k\ Lond. n. s. 9: 42. pi. 4 J- 6". 1861, 



or Moeb. Diat.-taf. plS7.f.G. 1890. 



31 71 3— VOL 10, VT 5— 07 



4 



